Merge 396544a70d into 44b4bd38b9

docs/en/sql-reference/statements/alter/role.md

@@ -13,5 +13,10 @@ Syntax:
 ``` sql
 ALTER ROLE [IF EXISTS] name1 [RENAME TO new_name |, name2 [,...]] 
     [ON CLUSTER cluster_name]
-    [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+    [ADD|MODIFY SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+    [DROP SETTINGS variable [,...] ]
+    [ADD PROFILES 'profile_name' [,...] ]
+    [DROP PROFILES 'profile_name' [,...] ]
+    [DROP ALL PROFILES]
+    [DROP ALL SETTINGS]
 ```

docs/en/sql-reference/statements/alter/settings-profile.md

@@ -13,6 +13,11 @@ Syntax:
 ``` sql
 ALTER SETTINGS PROFILE [IF EXISTS] name1 [RENAME TO new_name |, name2 [,...]] 
     [ON CLUSTER cluster_name]
-    [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | INHERIT 'profile_name'] [,...]
+    [ADD|MODIFY SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | INHERIT 'profile_name'] [,...]
     [TO {{role1 | user1 [, role2 | user2 ...]} | NONE | ALL | ALL EXCEPT {role1 | user1 [, role2 | user2 ...]}}]
+    [DROP SETTINGS variable [,...] ]
+    [ADD PROFILES 'profile_name' [,...] ]
+    [DROP PROFILES 'profile_name' [,...] ]
+    [DROP ALL PROFILES]
+    [DROP ALL SETTINGS]
 ```

docs/en/sql-reference/statements/alter/user.md

@@ -18,7 +18,12 @@ ALTER USER [IF EXISTS] name1 [RENAME TO new_name |, name2 [,...]]
     [VALID UNTIL datetime]
     [DEFAULT ROLE role [,...] | ALL | ALL EXCEPT role [,...] ]
     [GRANTEES {user | role | ANY | NONE} [,...] [EXCEPT {user | role} [,...]]]
-    [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [READONLY | WRITABLE] | PROFILE 'profile_name'] [,...]
+    [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [READONLY|WRITABLE|CONST|CHANGEABLE_IN_READONLY] [,...] ]
+    [DROP SETTINGS variable [,...] ]
+    [ADD PROFILES 'profile_name' [,...] ]
+    [DROP PROFILES 'profile_name' [,...] ]
+    [DROP ALL PROFILES]
+    [DROP ALL SETTINGS]
 ```
 
 To use `ALTER USER` you must have the [ALTER USER](../../../sql-reference/statements/grant.md#access-management) privilege.

docs/ru/sql-reference/statements/alter/role.md

@@ -13,5 +13,10 @@ sidebar_label: ROLE
 ``` sql
 ALTER ROLE [IF EXISTS] name1 [RENAME TO new_name |, name2 [,...]] 
     [ON CLUSTER cluster_name]
-    [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+    [ADD|MODIFY SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+    [DROP SETTINGS variable [,...] ]
+    [ADD PROFILES 'profile_name' [,...] ]
+    [DROP PROFILES 'profile_name' [,...] ]
+    [DROP ALL PROFILES]
+    [DROP ALL SETTINGS]
 ```

docs/ru/sql-reference/statements/alter/settings-profile.md

@@ -13,6 +13,11 @@ sidebar_label: SETTINGS PROFILE
 ``` sql
 ALTER SETTINGS PROFILE [IF EXISTS] name1 [RENAME TO new_name |, name2 [,...]] 
     [ON CLUSTER cluster_name]
-    [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | INHERIT 'profile_name'] [,...]
+    [ADD|MODIFY SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | INHERIT 'profile_name'] [,...]
     [TO {{role1 | user1 [, role2 | user2 ...]} | NONE | ALL | ALL EXCEPT {role1 | user1 [, role2 | user2 ...]}}]
+    [DROP SETTINGS variable [,...] ]
+    [ADD PROFILES 'profile_name' [,...] ]
+    [DROP PROFILES 'profile_name' [,...] ]
+    [DROP ALL PROFILES]
+    [DROP ALL SETTINGS]
 ```

docs/ru/sql-reference/statements/alter/user.md

@@ -19,7 +19,12 @@ ALTER USER [IF EXISTS] name1 [RENAME TO new_name |, name2 [,...]]
     [VALID UNTIL datetime]
     [DEFAULT ROLE role [,...] | ALL | ALL EXCEPT role [,...] ]
     [GRANTEES {user | role | ANY | NONE} [,...] [EXCEPT {user | role} [,...]]]
-    [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [READONLY | WRITABLE] | PROFILE 'profile_name'] [,...]
+    [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [READONLY|WRITABLE|CONST|CHANGEABLE_IN_READONLY] [,...] ]
+    [DROP SETTINGS variable [,...] ]
+    [ADD PROFILES 'profile_name' [,...] ]
+    [DROP PROFILES 'profile_name' [,...] ]
+    [DROP ALL PROFILES]
+    [DROP ALL SETTINGS]
 ```
 
 Для выполнения `ALTER USER` необходима привилегия [ALTER USER](../grant.md#grant-access-management).

src/Access/RoleCache.cpp

@@ -45,7 +45,7 @@ namespace
 
         roles_info.names_of_roles[role_id] = role->getName();
         roles_info.access.makeUnion(role->access);
-        roles_info.settings_from_enabled_roles.merge(role->settings);
+        roles_info.settings_from_enabled_roles.merge(role->settings, /* normalize= */ false);
 
         for (const auto & granted_role : role->granted_roles.getGranted())
             collectRoles(roles_info, skip_ids, get_role_function, granted_role, false, false);

src/Access/SettingsConstraints.cpp

@@ -137,6 +137,13 @@ void SettingsConstraints::merge(const SettingsConstraints & other)
 }
 
 
+void SettingsConstraints::check(const Settings & current_settings, const AlterSettingsProfileElements & profile_elements, SettingSource source) const
+{
+    check(current_settings, profile_elements.add_settings, source);
+    check(current_settings, profile_elements.modify_settings, source);
+    /// We don't check `drop_settings` here.
+}
+
 void SettingsConstraints::check(const Settings & current_settings, const SettingsProfileElements & profile_elements, SettingSource source) const
 {
     for (const auto & element : profile_elements)

src/Access/SettingsConstraints.h

@@ -74,10 +74,11 @@ public:
     void merge(const SettingsConstraints & other);
 
     /// Checks whether `change` violates these constraints and throws an exception if so.
-    void check(const Settings & current_settings, const SettingsProfileElements & profile_elements, SettingSource source) const;
     void check(const Settings & current_settings, const SettingChange & change, SettingSource source) const;
     void check(const Settings & current_settings, const SettingsChanges & changes, SettingSource source) const;
     void check(const Settings & current_settings, SettingsChanges & changes, SettingSource source) const;
+    void check(const Settings & current_settings, const SettingsProfileElements & profile_elements, SettingSource source) const;
+    void check(const Settings & current_settings, const AlterSettingsProfileElements & profile_elements, SettingSource source) const;
 
     /// Checks whether `change` violates these constraints and throws an exception if so. (setting short name is expected inside `changes`)
     void check(const MergeTreeSettings & current_settings, const SettingChange & change) const;

src/Access/SettingsProfileElement.cpp

@@ -9,6 +9,8 @@
 #include <IO/WriteHelpers.h>
 #include <Parsers/Access/ASTSettingsProfileElement.h>
 #include <base/removeDuplicates.h>
+#include <boost/container/flat_map.hpp>
+#include <boost/container/flat_set.hpp>
 
 
 namespace DB
@@ -19,6 +21,7 @@ namespace ErrorCodes
     extern const int NOT_IMPLEMENTED;
 }
 
+
 SettingsProfileElement::SettingsProfileElement(const ASTSettingsProfileElement & ast)
 {
     init(ast, nullptr);
@@ -116,16 +119,20 @@ std::shared_ptr<ASTSettingsProfileElement> SettingsProfileElement::toASTWithName
 }
 
 
-SettingsProfileElements::SettingsProfileElements(const ASTSettingsProfileElements & ast)
+SettingsProfileElements::SettingsProfileElements(const ASTSettingsProfileElements & ast, bool normalize_)
 {
     for (const auto & ast_element : ast.elements)
         emplace_back(*ast_element);
+    if (normalize_)
+        normalize();
 }
 
-SettingsProfileElements::SettingsProfileElements(const ASTSettingsProfileElements & ast, const AccessControl & access_control)
+SettingsProfileElements::SettingsProfileElements(const ASTSettingsProfileElements & ast, const AccessControl & access_control, bool normalize_)
 {
     for (const auto & ast_element : ast.elements)
         emplace_back(*ast_element, access_control);
+    if (normalize_)
+        normalize();
 }
 
 
@@ -133,7 +140,11 @@ std::shared_ptr<ASTSettingsProfileElements> SettingsProfileElements::toAST() con
 {
     auto res = std::make_shared<ASTSettingsProfileElements>();
     for (const auto & element : *this)
-        res->elements.push_back(element.toAST());
+    {
+        auto element_ast = element.toAST();
+        if (!element_ast->empty())
+            res->elements.push_back(element_ast);
+    }
     return res;
 }
 
@@ -141,7 +152,11 @@ std::shared_ptr<ASTSettingsProfileElements> SettingsProfileElements::toASTWithNa
 {
     auto res = std::make_shared<ASTSettingsProfileElements>();
     for (const auto & element : *this)
-        res->elements.push_back(element.toASTWithNames(access_control));
+    {
+        auto element_ast = element.toASTWithNames(access_control);
+        if (!element_ast->empty())
+            res->elements.push_back(element_ast);
+    }
     return res;
 }
 
@@ -220,9 +235,11 @@ void SettingsProfileElements::removeSettingsKeepProfiles()
 }
 
 
-void SettingsProfileElements::merge(const SettingsProfileElements & other)
+void SettingsProfileElements::merge(const SettingsProfileElements & other, bool normalize_)
 {
     insert(end(), other.begin(), other.end());
+    if (normalize_)
+        normalize();
 }
 
 
@@ -280,6 +297,81 @@ std::vector<UUID> SettingsProfileElements::toProfileIDs() const
     return res;
 }
 
+
+void SettingsProfileElements::normalize()
+{
+    /// Ensure that each element represents either a setting or a profile.
+    {
+        SettingsProfileElements new_elements;
+        for (auto & element : *this)
+        {
+            if (element.parent_profile && !element.setting_name.empty())
+            {
+                SettingsProfileElement new_element;
+                new_element.parent_profile = element.parent_profile;
+                element.parent_profile.reset();
+                new_elements.push_back(std::move(new_element));
+            }
+        }
+        insert(end(), new_elements.begin(), new_elements.end());
+    }
+
+    /// Partitioning: first profiles, then settings.
+    /// We use std::stable_partition() here because we want to preserve the relative order of profiles and the relative order of settings.
+    /// (We need that order to be preserved to remove duplicates correctly - see below.)
+    auto profiles_begin = begin();
+    auto profiles_end = std::stable_partition(begin(), end(), [](const SettingsProfileElement & element) { return static_cast<bool>(element.parent_profile); });
+    auto settings_begin = profiles_end;
+    auto settings_end = end();
+
+    /// Remove duplicates among profiles.
+    /// We keep the last position of any used profile.
+    /// It's important to keep exactly the last position (and not just any position) because profiles can override settings from each other.
+    /// For example, [pr_A, pr_B, pr_A, pr_C] is always the same as [pr_B, pr_A, pr_C], but can be not the same as [pr_A, pr_B, pr_C]
+    /// if pr_A and pr_B give different values to same settings.
+    {
+        boost::container::flat_set<UUID> profile_ids;
+        profile_ids.reserve(profiles_end - profiles_begin);
+        auto it = profiles_end;
+        while (it != profiles_begin)
+        {
+            --it;
+            auto & element = *it;
+            if (element.parent_profile && !profile_ids.emplace(*element.parent_profile).second)
+                element.parent_profile.reset();
+        }
+    }
+
+    /// Remove duplicates among settings.
+    /// We keep the first position of any used setting, and merge settings with the same name to that first element.
+    {
+        boost::container::flat_map<std::string_view, SettingsProfileElements::iterator> setting_name_to_first_encounter;
+        setting_name_to_first_encounter.reserve(settings_end - settings_begin);
+        for (auto it = settings_begin; it != settings_end; ++it)
+        {
+            auto & element = *it;
+            auto first = setting_name_to_first_encounter.emplace(element.setting_name, it).first->second;
+            if (it != first)
+            {
+                auto & first_element = *first;
+                if (element.value)
+                    first_element.value = element.value;
+                if (element.min_value)
+                    first_element.min_value = element.min_value;
+                if (element.max_value)
+                    first_element.max_value = element.max_value;
+                if (element.writability)
+                    first_element.writability = element.writability;
+                element.setting_name.clear();
+            }
+        }
+    }
+
+    /// Remove empty elements.
+    std::erase_if(*this, [](const SettingsProfileElement & element) { return element.empty(); });
+}
+
+
 bool SettingsProfileElements::isBackupAllowed() const
 {
     for (const auto & setting : *this)
@@ -296,4 +388,139 @@ bool SettingsProfileElements::isAllowBackupSetting(const String & setting_name)
     return Settings::resolveName(setting_name) == ALLOW_BACKUP_SETTING_NAME;
 }
 
+
+AlterSettingsProfileElements::AlterSettingsProfileElements(const SettingsProfileElements & ast)
+{
+    drop_all_settings = true;
+    drop_all_profiles = true;
+    add_settings = ast;
+}
+
+AlterSettingsProfileElements::AlterSettingsProfileElements(const ASTSettingsProfileElements & ast)
+    : AlterSettingsProfileElements(SettingsProfileElements{ast})
+{
+}
+
+AlterSettingsProfileElements::AlterSettingsProfileElements(const ASTSettingsProfileElements & ast, const AccessControl & access_control)
+    : AlterSettingsProfileElements(SettingsProfileElements{ast, access_control})
+{
+}
+
+AlterSettingsProfileElements::AlterSettingsProfileElements(const ASTAlterSettingsProfileElements & ast)
+{
+    drop_all_settings = ast.drop_all_settings;
+    drop_all_profiles = ast.drop_all_profiles;
+
+    if (ast.add_settings)
+        add_settings = SettingsProfileElements{*ast.add_settings, /* normalize= */ false}; /// For "ALTER" the normalization is unnecessary.
+
+    if (ast.modify_settings)
+        modify_settings = SettingsProfileElements{*ast.modify_settings, /* normalize= */ false};
+
+    if (ast.drop_settings)
+        drop_settings = SettingsProfileElements{*ast.drop_settings, /* normalize= */ false};
+}
+
+AlterSettingsProfileElements::AlterSettingsProfileElements(const ASTAlterSettingsProfileElements & ast, const AccessControl & access_control)
+{
+    drop_all_settings = ast.drop_all_settings;
+    drop_all_profiles = ast.drop_all_profiles;
+
+    if (ast.add_settings)
+        add_settings = SettingsProfileElements{*ast.add_settings, access_control, /* normalize= */ false}; /// For "ALTER" the normalization is unnecessary.
+
+    if (ast.modify_settings)
+        modify_settings = SettingsProfileElements{*ast.modify_settings, access_control, /* normalize= */ false};
+
+    if (ast.drop_settings)
+        drop_settings = SettingsProfileElements{*ast.drop_settings, access_control, /* normalize= */ false};
+}
+
+void SettingsProfileElements::applyChanges(const AlterSettingsProfileElements & changes)
+{
+    /// Apply "DROP" changes.
+    if (changes.drop_all_profiles)
+    {
+        for (auto & element : *this)
+            element.parent_profile.reset(); /// We only make this element empty, the element will be removed in normalizeProfileElements().
+    }
+
+    if (changes.drop_all_settings)
+    {
+        for (auto & element : *this)
+            element.setting_name.clear(); /// We only make this element empty, the element will be removed in normalizeProfileElements().
+    }
+
+    auto apply_drop_setting = [&](const String & setting_name)
+    {
+        for (auto & element : *this)
+        {
+            if (element.setting_name == setting_name)
+                element.setting_name.clear();
+        }
+    };
+
+    auto apply_drop_profile = [&](const UUID & profile_id)
+    {
+        for (auto & element : *this)
+        {
+            if (element.parent_profile == profile_id)
+                element.parent_profile.reset();
+        }
+    };
+
+    for (const auto & drop : changes.drop_settings)
+    {
+        if (drop.parent_profile)
+            apply_drop_profile(*drop.parent_profile);
+        if (!drop.setting_name.empty())
+            apply_drop_setting(drop.setting_name);
+    }
+
+    auto apply_modify_setting = [&](const SettingsProfileElement & modify)
+    {
+        SettingsProfileElement new_element;
+        new_element.setting_name = modify.setting_name;
+        new_element.value = modify.value;
+        new_element.min_value = modify.min_value;
+        new_element.max_value = modify.max_value;
+        new_element.writability = modify.writability;
+        push_back(new_element); /// normalizeProfileElements() will merge this new element with the previous elements.
+    };
+
+    /// Apply "ADD" changes.
+    auto apply_add_setting = [&](const SettingsProfileElement & add)
+    {
+        /// "ADD SETTING" must replace the value and the constraints of a setting, so first we need drop the previous elements for that setting.
+        apply_drop_setting(add.setting_name);
+        apply_modify_setting(add);
+    };
+
+    auto apply_add_profile = [&](const UUID & profile_id)
+    {
+        SettingsProfileElement new_element;
+        new_element.parent_profile = profile_id;
+        push_back(new_element); /// We don't care about possible duplicates here, normalizeProfileElements() will remove duplicates.
+    };
+
+    for (const auto & add : changes.add_settings)
+    {
+        if (add.parent_profile)
+            apply_add_profile(*add.parent_profile);
+        if (!add.setting_name.empty())
+            apply_add_setting(add);
+    }
+
+    /// Apply "MODIFY" changes.
+    for (const auto & modify : changes.modify_settings)
+    {
+        chassert(!modify.parent_profile); /// There is no such thing as "MODIFY PROFILE".
+        if (!modify.setting_name.empty())
+            apply_modify_setting(modify);
+    }
+
+    /// Remove empty elements and duplicates, and sort the result.
+    normalize();
+}
+
 }

src/Access/SettingsProfileElement.h

@@ -13,8 +13,10 @@ namespace DB
 struct Settings;
 class SettingsChanges;
 class SettingsConstraints;
+struct AlterSettingsProfileElements;
 class ASTSettingsProfileElement;
 class ASTSettingsProfileElements;
+class ASTAlterSettingsProfileElements;
 class AccessControl;
 
 
@@ -44,6 +46,8 @@ struct SettingsProfileElement
     std::shared_ptr<ASTSettingsProfileElement> toAST() const;
     std::shared_ptr<ASTSettingsProfileElement> toASTWithNames(const AccessControl & access_control) const;
 
+    bool empty() const { return !parent_profile && (setting_name.empty() || (!value && !min_value && !max_value && !writability)); }
+
     bool isConstraint() const;
 
 private:
@@ -57,8 +61,9 @@ public:
     SettingsProfileElements() = default;
 
     /// The constructor from AST requires the AccessControl if `ast.id_mode == false`.
-    SettingsProfileElements(const ASTSettingsProfileElements & ast); /// NOLINT
+    SettingsProfileElements(const ASTSettingsProfileElements & ast, bool normalize_ = true); /// NOLINT
-    SettingsProfileElements(const ASTSettingsProfileElements & ast, const AccessControl & access_control);
+    SettingsProfileElements(const ASTSettingsProfileElements & ast, const AccessControl & access_control, bool normalize_ = true);
+
     std::shared_ptr<ASTSettingsProfileElements> toAST() const;
     std::shared_ptr<ASTSettingsProfileElements> toASTWithNames(const AccessControl & access_control) const;
 
@@ -70,16 +75,41 @@ public:
 
     void removeSettingsKeepProfiles();
 
-    void merge(const SettingsProfileElements & other);
-
     Settings toSettings() const;
     SettingsChanges toSettingsChanges() const;
     SettingsConstraints toSettingsConstraints(const AccessControl & access_control) const;
     std::vector<UUID> toProfileIDs() const;
 
-    bool isBackupAllowed() const;
+    /// Normalizes this list of profile elements: removes duplicates and empty elements, and also sorts the elements
+    /// in the following order: first profiles, then settings.
+    /// The function is called automatically after parsing profile elements from an AST and
+    /// at the end of an "ALTER PROFILE (USER/ROLE) command".
+    void normalize();
 
+    /// Appends all the elements of another list of profile elements to this list.
+    void merge(const SettingsProfileElements & other, bool normalize_ = true);
+
+    /// Applies changes from an "ALTER PROFILE (USER/ROLE)" command. Always normalizes the result.
+    void applyChanges(const AlterSettingsProfileElements & changes);
+
+    bool isBackupAllowed() const;
     static bool isAllowBackupSetting(const String & setting_name);
 };
 
+struct AlterSettingsProfileElements
+{
+    bool drop_all_settings = false;
+    bool drop_all_profiles = false;
+    SettingsProfileElements add_settings;
+    SettingsProfileElements modify_settings;
+    SettingsProfileElements drop_settings;
+
+    AlterSettingsProfileElements() = default;
+    explicit AlterSettingsProfileElements(const SettingsProfileElements & ast);
+    explicit AlterSettingsProfileElements(const ASTSettingsProfileElements & ast);
+    explicit AlterSettingsProfileElements(const ASTAlterSettingsProfileElements & ast);
+    AlterSettingsProfileElements(const ASTSettingsProfileElements & ast, const AccessControl & access_control);
+    AlterSettingsProfileElements(const ASTAlterSettingsProfileElements & ast, const AccessControl & access_control);
+};
+
 }

src/Access/SettingsProfilesCache.cpp

@@ -135,8 +135,8 @@ void SettingsProfilesCache::mergeSettingsAndConstraintsFor(EnabledSettings & ena
             merged_settings.emplace_back(new_element);
         }
 
-    merged_settings.merge(enabled.params.settings_from_enabled_roles);
+    merged_settings.merge(enabled.params.settings_from_enabled_roles, /* normalize= */ false);
-    merged_settings.merge(enabled.params.settings_from_user);
+    merged_settings.merge(enabled.params.settings_from_user, /* normalize= */ false);
 
     auto info = std::make_shared<SettingsProfilesInfo>(access_control);
 

src/Interpreters/Access/InterpreterCreateRoleQuery.cpp

@@ -23,7 +23,7 @@ namespace
         Role & role,
         const ASTCreateRoleQuery & query,
         const String & override_name,
-        const std::optional<SettingsProfileElements> & override_settings)
+        const std::optional<AlterSettingsProfileElements> & override_settings)
     {
         if (!override_name.empty())
             role.setName(override_name);
@@ -33,9 +33,11 @@ namespace
             role.setName(query.names.front());
 
         if (override_settings)
-            role.settings = *override_settings;
+            role.settings.applyChanges(*override_settings);
+        else if (query.alter_settings)
+            role.settings.applyChanges(AlterSettingsProfileElements{*query.alter_settings});
         else if (query.settings)
-            role.settings = *query.settings;
+            role.settings.applyChanges(AlterSettingsProfileElements{*query.settings});
     }
 }
 
@@ -51,14 +53,14 @@ BlockIO InterpreterCreateRoleQuery::execute()
     else
         getContext()->checkAccess(AccessType::CREATE_ROLE);
 
-    std::optional<SettingsProfileElements> settings_from_query;
+    std::optional<AlterSettingsProfileElements> settings_from_query;
-    if (query.settings)
+    if (query.alter_settings)
-    {
+        settings_from_query = AlterSettingsProfileElements{*query.alter_settings, access_control};
-        settings_from_query = SettingsProfileElements{*query.settings, access_control};
+    else if (query.settings)
+        settings_from_query = AlterSettingsProfileElements{SettingsProfileElements(*query.settings, access_control)};
 
-        if (!query.attach)
+    if (settings_from_query && !query.attach)
         getContext()->checkSettingsConstraints(*settings_from_query, SettingSource::ROLE);
-    }
 
     if (!query.cluster.empty())
         return executeDDLQueryOnCluster(updated_query_ptr, getContext());

src/Interpreters/Access/InterpreterCreateSettingsProfileQuery.cpp

@@ -25,7 +25,7 @@ namespace
         SettingsProfile & profile,
         const ASTCreateSettingsProfileQuery & query,
         const String & override_name,
-        const std::optional<SettingsProfileElements> & override_settings,
+        const std::optional<AlterSettingsProfileElements> & override_settings,
         const std::optional<RolesOrUsersSet> & override_to_roles)
     {
         if (!override_name.empty())
@@ -36,9 +36,11 @@ namespace
             profile.setName(query.names.front());
 
         if (override_settings)
-            profile.elements = *override_settings;
+            profile.elements.applyChanges(*override_settings);
+        else if (query.alter_settings)
+            profile.elements.applyChanges(AlterSettingsProfileElements{*query.alter_settings});
         else if (query.settings)
-            profile.elements = *query.settings;
+            profile.elements.applyChanges(AlterSettingsProfileElements{*query.settings});
 
         if (override_to_roles)
             profile.to_roles = *override_to_roles;
@@ -59,14 +61,14 @@ BlockIO InterpreterCreateSettingsProfileQuery::execute()
     else
         getContext()->checkAccess(AccessType::CREATE_SETTINGS_PROFILE);
 
-    std::optional<SettingsProfileElements> settings_from_query;
+    std::optional<AlterSettingsProfileElements> settings_from_query;
-    if (query.settings)
+    if (query.alter_settings)
-    {
+        settings_from_query = AlterSettingsProfileElements{*query.alter_settings, access_control};
-        settings_from_query = SettingsProfileElements{*query.settings, access_control};
+    else if (query.settings)
+        settings_from_query = AlterSettingsProfileElements{SettingsProfileElements(*query.settings, access_control)};
 
-        if (!query.attach)
+    if (settings_from_query && !query.attach)
         getContext()->checkSettingsConstraints(*settings_from_query, SettingSource::PROFILE);
-    }
 
     if (!query.cluster.empty())
     {

src/Interpreters/Access/InterpreterCreateUserQuery.cpp

@@ -43,7 +43,7 @@ namespace
         const std::vector<AuthenticationData> authentication_methods,
         const std::shared_ptr<ASTUserNameWithHost> & override_name,
         const std::optional<RolesOrUsersSet> & override_default_roles,
-        const std::optional<SettingsProfileElements> & override_settings,
+        const std::optional<AlterSettingsProfileElements> & override_settings,
         const std::optional<RolesOrUsersSet> & override_grantees,
         const std::optional<time_t> & global_valid_until,
         bool reset_authentication_methods,
@@ -172,9 +172,11 @@ namespace
             user.default_database = query.default_database->database_name;
 
         if (override_settings)
-            user.settings = *override_settings;
+            user.settings.applyChanges(*override_settings);
+        else if (query.alter_settings)
+            user.settings.applyChanges(AlterSettingsProfileElements{*query.alter_settings});
         else if (query.settings)
-            user.settings = *query.settings;
+            user.settings.applyChanges(AlterSettingsProfileElements{*query.settings});
 
         if (override_grantees)
             user.grantees = *override_grantees;
@@ -219,14 +221,14 @@ BlockIO InterpreterCreateUserQuery::execute()
         }
     }
 
-    std::optional<SettingsProfileElements> settings_from_query;
+    std::optional<AlterSettingsProfileElements> settings_from_query;
-    if (query.settings)
+    if (query.alter_settings)
-    {
+        settings_from_query = AlterSettingsProfileElements{*query.alter_settings, access_control};
-        settings_from_query = SettingsProfileElements{*query.settings, access_control};
+    else if (query.settings)
+        settings_from_query = AlterSettingsProfileElements{*query.settings, access_control};
 
-        if (!query.attach)
+    if (settings_from_query && !query.attach)
         getContext()->checkSettingsConstraints(*settings_from_query, SettingSource::USER);
-    }
 
     if (!query.cluster.empty())
         return executeDDLQueryOnCluster(updated_query_ptr, getContext());

src/Interpreters/Access/InterpreterShowCreateAccessEntityQuery.cpp

@@ -71,10 +71,13 @@ namespace
 
         if (!user.settings.empty())
         {
+            std::shared_ptr<ASTSettingsProfileElements> query_settings;
             if (attach_mode)
-                query->settings = user.settings.toAST();
+                query_settings = user.settings.toAST();
             else
-                query->settings = user.settings.toASTWithNames(*access_control);
+                query_settings = user.settings.toASTWithNames(*access_control);
+            if (!query_settings->empty())
+                query->settings = query_settings;
         }
 
         if (user.grantees != RolesOrUsersSet::AllTag{})
@@ -105,10 +108,13 @@ namespace
 
         if (!role.settings.empty())
         {
+            std::shared_ptr<ASTSettingsProfileElements> query_settings;
             if (attach_mode)
-                query->settings = role.settings.toAST();
+                query_settings = role.settings.toAST();
             else
-                query->settings = role.settings.toASTWithNames(*access_control);
+                query_settings = role.settings.toASTWithNames(*access_control);
+            if (!query_settings->empty())
+                query->settings = query_settings;
         }
 
         return query;
@@ -123,12 +129,16 @@ namespace
 
         if (!profile.elements.empty())
         {
+            std::shared_ptr<ASTSettingsProfileElements> query_settings;
             if (attach_mode)
-                query->settings = profile.elements.toAST();
+                query_settings = profile.elements.toAST();
             else
-                query->settings = profile.elements.toASTWithNames(*access_control);
+                query_settings = profile.elements.toASTWithNames(*access_control);
-            if (query->settings)
+            if (!query_settings->empty())
-                query->settings->setUseInheritKeyword(true);
+            {
+                query_settings->setUseInheritKeyword(true);
+                query->settings = query_settings;
+            }
         }
 
         if (!profile.to_roles.empty())

src/Interpreters/Context.cpp

@@ -2521,7 +2521,7 @@ void Context::applySettingsChanges(const SettingsChanges & changes)
     applySettingsChangesWithLock(changes, lock);
 }
 
-void Context::checkSettingsConstraintsWithLock(const SettingsProfileElements & profile_elements, SettingSource source)
+void Context::checkSettingsConstraintsWithLock(const AlterSettingsProfileElements & profile_elements, SettingSource source)
 {
     getSettingsConstraintsAndCurrentProfilesWithLock()->constraints.check(*settings, profile_elements, source);
     if (getApplicationType() == ApplicationType::LOCAL || getApplicationType() == ApplicationType::SERVER)
@@ -2561,7 +2561,7 @@ void Context::checkMergeTreeSettingsConstraintsWithLock(const MergeTreeSettings
     getSettingsConstraintsAndCurrentProfilesWithLock()->constraints.check(merge_tree_settings, changes);
 }
 
-void Context::checkSettingsConstraints(const SettingsProfileElements & profile_elements, SettingSource source)
+void Context::checkSettingsConstraints(const AlterSettingsProfileElements & profile_elements, SettingSource source)
 {
     SharedLockGuard lock(mutex);
     checkSettingsConstraintsWithLock(profile_elements, source);

src/Interpreters/Context.h

@@ -145,7 +145,7 @@ struct Settings;
 struct SettingChange;
 class SettingsChanges;
 struct SettingsConstraintsAndProfileIDs;
-class SettingsProfileElements;
+struct AlterSettingsProfileElements;
 class RemoteHostFilter;
 class IDisk;
 using DiskPtr = std::shared_ptr<IDisk>;
@@ -865,7 +865,7 @@ public:
     void applySettingsChanges(const SettingsChanges & changes);
 
     /// Checks the constraints.
-    void checkSettingsConstraints(const SettingsProfileElements & profile_elements, SettingSource source);
+    void checkSettingsConstraints(const AlterSettingsProfileElements & profile_elements, SettingSource source);
     void checkSettingsConstraints(const SettingChange & change, SettingSource source);
     void checkSettingsConstraints(const SettingsChanges & changes, SettingSource source);
     void checkSettingsConstraints(SettingsChanges & changes, SettingSource source);
@@ -1413,7 +1413,7 @@ private:
 
     void setCurrentDatabaseWithLock(const String & name, const std::lock_guard<ContextSharedMutex> & lock);
 
-    void checkSettingsConstraintsWithLock(const SettingsProfileElements & profile_elements, SettingSource source);
+    void checkSettingsConstraintsWithLock(const AlterSettingsProfileElements & profile_elements, SettingSource source);
 
     void checkSettingsConstraintsWithLock(const SettingChange & change, SettingSource source);
 
@@ -1422,6 +1422,9 @@ private:
     void checkSettingsConstraintsWithLock(SettingsChanges & changes, SettingSource source);
 
     void clampToSettingsConstraintsWithLock(SettingsChanges & changes, SettingSource source);
+    void checkSettingsConstraintsWithLock(const AlterSettingsProfileElements & profile_elements, SettingSource source) const;
+
+    void clampToSettingsConstraintsWithLock(SettingsChanges & changes, SettingSource source) const;
 
     void checkMergeTreeSettingsConstraintsWithLock(const MergeTreeSettings & merge_tree_settings, const SettingsChanges & changes) const;
 

src/Parsers/Access/ASTCreateRoleQuery.cpp

@@ -31,6 +31,12 @@ namespace
         format.ostr << (format.hilite ? IAST::hilite_keyword : "") << " SETTINGS " << (format.hilite ? IAST::hilite_none : "");
         settings.format(format);
     }
+
+    void formatAlterSettings(const ASTAlterSettingsProfileElements & alter_settings, const IAST::FormatSettings & format)
+    {
+        format.ostr << " ";
+        alter_settings.format(format);
+    }
 }
 
 
@@ -47,6 +53,9 @@ ASTPtr ASTCreateRoleQuery::clone() const
     if (settings)
         res->settings = std::static_pointer_cast<ASTSettingsProfileElements>(settings->clone());
 
+    if (alter_settings)
+        res->alter_settings = std::static_pointer_cast<ASTAlterSettingsProfileElements>(alter_settings->clone());
+
     return res;
 }
 
@@ -82,7 +91,9 @@ void ASTCreateRoleQuery::formatImpl(const FormatSettings & format, FormatState &
     if (!new_name.empty())
         formatRenameTo(new_name, format);
 
-    if (settings && (!settings->empty() || alter))
+    if (alter_settings)
+        formatAlterSettings(*alter_settings, format);
+    else if (settings)
         formatSettings(*settings, format);
 }
 

src/Parsers/Access/ASTCreateRoleQuery.h

@@ -7,6 +7,7 @@
 namespace DB
 {
 class ASTSettingsProfileElements;
+class ASTAlterSettingsProfileElements;
 
 
 /** CREATE ROLE [IF NOT EXISTS | OR REPLACE] name
@@ -14,7 +15,12 @@ class ASTSettingsProfileElements;
   *
   * ALTER ROLE [IF EXISTS] name
   *     [RENAME TO new_name]
-  *     [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+  *     [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] [,...] ]
+  *     [DROP SETTINGS variable [,...] ]
+  *     [ADD PROFILES 'profile_name' [,...] ]
+  *     [DROP PROFILES 'profile_name' [,...] ]
+  *     [DROP ALL PROFILES]
+  *     [DROP ALL SETTINGS]
   */
 class ASTCreateRoleQuery : public IAST, public ASTQueryWithOnCluster
 {
@@ -31,6 +37,7 @@ public:
     String storage_name;
 
     std::shared_ptr<ASTSettingsProfileElements> settings;
+    std::shared_ptr<ASTAlterSettingsProfileElements> alter_settings;
 
     String getID(char) const override;
     ASTPtr clone() const override;

src/Parsers/Access/ASTCreateSettingsProfileQuery.cpp

@@ -33,6 +33,12 @@ namespace
         settings.format(format);
     }
 
+    void formatAlterSettings(const ASTAlterSettingsProfileElements & alter_settings, const IAST::FormatSettings & format)
+    {
+        format.ostr << " ";
+        alter_settings.format(format);
+    }
+
     void formatToRoles(const ASTRolesOrUsersSet & roles, const IAST::FormatSettings & settings)
     {
         settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << " TO " << (settings.hilite ? IAST::hilite_none : "");
@@ -57,6 +63,9 @@ ASTPtr ASTCreateSettingsProfileQuery::clone() const
     if (settings)
         res->settings = std::static_pointer_cast<ASTSettingsProfileElements>(settings->clone());
 
+    if (alter_settings)
+        res->alter_settings = std::static_pointer_cast<ASTAlterSettingsProfileElements>(alter_settings->clone());
+
     return res;
 }
 
@@ -92,7 +101,9 @@ void ASTCreateSettingsProfileQuery::formatImpl(const FormatSettings & format, Fo
     if (!new_name.empty())
         formatRenameTo(new_name, format);
 
-    if (settings && (!settings->empty() || alter))
+    if (alter_settings)
+        formatAlterSettings(*alter_settings, format);
+    else if (settings)
         formatSettings(*settings, format);
 
     if (to_roles && (!to_roles->empty() || alter))

src/Parsers/Access/ASTCreateSettingsProfileQuery.h

@@ -7,6 +7,7 @@
 namespace DB
 {
 class ASTSettingsProfileElements;
+class ASTAlterSettingsProfileElements;
 class ASTRolesOrUsersSet;
 
 
@@ -16,7 +17,12 @@ class ASTRolesOrUsersSet;
   *
   * ALTER SETTINGS PROFILE [IF EXISTS] name
   *     [RENAME TO new_name]
-  *     [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+  *     [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] [,...] ]
+  *     [DROP SETTINGS variable [,...] ]
+  *     [ADD PROFILES 'profile_name' [,...] ]
+  *     [DROP PROFILES 'profile_name' [,...] ]
+  *     [DROP ALL PROFILES]
+  *     [DROP ALL SETTINGS]
   *     [TO {role [,...] | ALL | ALL EXCEPT role [,...]}]
   */
 class ASTCreateSettingsProfileQuery : public IAST, public ASTQueryWithOnCluster
@@ -34,6 +40,7 @@ public:
     String new_name;
 
     std::shared_ptr<ASTSettingsProfileElements> settings;
+    std::shared_ptr<ASTAlterSettingsProfileElements> alter_settings;
 
     std::shared_ptr<ASTRolesOrUsersSet> to_roles;
 
@@ -44,4 +51,5 @@ public:
     ASTPtr getRewrittenASTWithoutOnCluster(const WithoutOnClusterASTRewriteParams &) const override { return removeOnCluster<ASTCreateSettingsProfileQuery>(clone()); }
     QueryKind getQueryKind() const override { return QueryKind::Create; }
 };
+
 }

src/Parsers/Access/ASTCreateUserQuery.cpp

@@ -149,13 +149,17 @@ namespace
         default_roles.format(settings);
     }
 
-
     void formatSettings(const ASTSettingsProfileElements & settings, const IAST::FormatSettings & format)
     {
         format.ostr << (format.hilite ? IAST::hilite_keyword : "") << " SETTINGS " << (format.hilite ? IAST::hilite_none : "");
         settings.format(format);
     }
 
+    void formatAlterSettings(const ASTAlterSettingsProfileElements & alter_settings, const IAST::FormatSettings & format)
+    {
+        format.ostr << " ";
+        alter_settings.format(format);
+    }
 
     void formatGrantees(const ASTRolesOrUsersSet & grantees, const IAST::FormatSettings & settings)
     {
@@ -198,6 +202,9 @@ ASTPtr ASTCreateUserQuery::clone() const
     if (settings)
         res->settings = std::static_pointer_cast<ASTSettingsProfileElements>(settings->clone());
 
+    if (alter_settings)
+        res->alter_settings = std::static_pointer_cast<ASTAlterSettingsProfileElements>(alter_settings->clone());
+
     for (const auto & authentication_method : authentication_methods)
     {
         auto ast_clone = std::static_pointer_cast<ASTAuthenticationData>(authentication_method->clone());
@@ -278,7 +285,9 @@ void ASTCreateUserQuery::formatImpl(const FormatSettings & format, FormatState &
     if (default_roles)
         formatDefaultRoles(*default_roles, format);
 
-    if (settings && (!settings->empty() || alter))
+    if (alter_settings)
+        formatAlterSettings(*alter_settings, format);
+    else if (settings)
         formatSettings(*settings, format);
 
     if (grantees)

src/Parsers/Access/ASTCreateUserQuery.h

@@ -13,6 +13,7 @@ class ASTUserNamesWithHost;
 class ASTRolesOrUsersSet;
 class ASTDatabaseOrNone;
 class ASTSettingsProfileElements;
+class ASTAlterSettingsProfileElements;
 class ASTAuthenticationData;
 
 
@@ -30,7 +31,12 @@ class ASTAuthenticationData;
   *     [[ADD|DROP] HOST {LOCAL | NAME 'name' | REGEXP 'name_regexp' | IP 'address' | LIKE 'pattern'} [,...] | ANY | NONE]
   *     [DEFAULT ROLE role [,...] | ALL | ALL EXCEPT role [,...] ]
   *     [DEFAULT DATABASE database | NONE]
-  *     [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+  *     [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] [,...] ]
+  *     [DROP SETTINGS variable [,...] ]
+  *     [ADD PROFILES 'profile_name' [,...] ]
+  *     [DROP PROFILES 'profile_name' [,...] ]
+  *     [DROP ALL PROFILES]
+  *     [DROP ALL SETTINGS]
   *     [GRANTEES {user | role | ANY | NONE} [,...] [EXCEPT {user | role} [,...]]]
   */
 class ASTCreateUserQuery : public IAST, public ASTQueryWithOnCluster
@@ -58,6 +64,7 @@ public:
 
     std::shared_ptr<ASTRolesOrUsersSet> default_roles;
     std::shared_ptr<ASTSettingsProfileElements> settings;
+    std::shared_ptr<ASTAlterSettingsProfileElements> alter_settings;
     std::shared_ptr<ASTRolesOrUsersSet> grantees;
 
     std::shared_ptr<ASTDatabaseOrNone> default_database;

src/Parsers/Access/ASTSettingsProfileElement.cpp

@@ -3,6 +3,7 @@
 #include <Common/FieldVisitorToString.h>
 #include <Common/quoteString.h>
 #include <IO/Operators.h>
+#include <base/insertAtEnd.h>
 
 
 namespace DB
@@ -21,7 +22,53 @@ namespace
             settings.ostr << backQuote(str);
         }
     }
+
+    void formatSettingsProfileElementsForAlter(std::string_view kind, const ASTSettingsProfileElements & elements, const IAST::FormatSettings & settings)
+    {
+        bool need_comma = false;
+
+        size_t num_profiles = elements.getNumberOfProfiles();
+        if (num_profiles > 0)
+        {
+            settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << kind << " " << (num_profiles == 1 ? "PROFILE" : "PROFILES")
+                          << (settings.hilite ? IAST::hilite_none : "") << " ";
+
+            for (const auto & element : elements.elements)
+            {
+                if (!element->parent_profile.empty())
+                {
+                    if (need_comma)
+                        settings.ostr << ", ";
+                    formatProfileNameOrID(element->parent_profile, /* is_id= */ false, settings);
+                    need_comma = true;
                 }
+            }
+        }
+
+        size_t num_settings = elements.getNumberOfSettings();
+        if (num_settings > 0)
+        {
+            if (need_comma)
+                settings.ostr << ", ";
+            need_comma = false;
+
+            settings.ostr << (settings.hilite ? IAST::hilite_keyword : "") << kind << " " << (num_settings == 1 ? "SETTING" : "SETTINGS")
+                          << (settings.hilite ? IAST::hilite_none : "") << " ";
+
+            for (const auto & element : elements.elements)
+            {
+                if (!element->setting_name.empty())
+                {
+                    if (need_comma)
+                        settings.ostr << ", ";
+                    element->format(settings);
+                    need_comma = true;
+                }
+            }
+        }
+    }
+}
+
 
 void ASTSettingsProfileElement::formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const
 {
@@ -82,6 +129,27 @@ bool ASTSettingsProfileElements::empty() const
     return true;
 }
 
+size_t ASTSettingsProfileElements::getNumberOfSettings() const
+{
+    return std::count_if(elements.begin(), elements.end(), [](const auto & element){ return !element->setting_name.empty(); });
+}
+
+size_t ASTSettingsProfileElements::getNumberOfProfiles() const
+{
+    return std::count_if(elements.begin(), elements.end(), [](const auto & element){ return !element->parent_profile.empty(); });
+}
+
+
+ASTPtr ASTSettingsProfileElements::clone() const
+{
+    auto res = std::make_shared<ASTSettingsProfileElements>(*this);
+
+    for (auto & element : res->elements)
+        element = std::static_pointer_cast<ASTSettingsProfileElement>(element->clone());
+
+    return res;
+}
+
 
 void ASTSettingsProfileElements::formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const
 {
@@ -109,4 +177,108 @@ void ASTSettingsProfileElements::setUseInheritKeyword(bool use_inherit_keyword_)
         element->use_inherit_keyword = use_inherit_keyword_;
 }
 
+
+void ASTSettingsProfileElements::add(ASTSettingsProfileElements && other)
+{
+    insertAtEnd(elements, std::move(other.elements));
+}
+
+
+String ASTAlterSettingsProfileElements::getID(char) const
+{
+    return "AlterSettingsProfileElements";
+}
+
+ASTPtr ASTAlterSettingsProfileElements::clone() const
+{
+    auto res = std::make_shared<ASTAlterSettingsProfileElements>(*this);
+
+    if (add_settings)
+        res->add_settings = std::static_pointer_cast<ASTSettingsProfileElements>(add_settings->clone());
+
+    if (modify_settings)
+        res->modify_settings = std::static_pointer_cast<ASTSettingsProfileElements>(modify_settings->clone());
+
+    if (drop_settings)
+        res->drop_settings = std::static_pointer_cast<ASTSettingsProfileElements>(drop_settings->clone());
+
+    return res;
+}
+
+void ASTAlterSettingsProfileElements::formatImpl(const FormatSettings & format, FormatState &, FormatStateStacked) const
+{
+    bool need_comma = false;
+
+    if (drop_all_settings)
+    {
+        format.ostr << (format.hilite ? IAST::hilite_keyword : "") << "DROP ALL SETTINGS" << (format.hilite ? IAST::hilite_none : "");
+        need_comma = true;
+    }
+
+    if (drop_all_profiles)
+    {
+        if (need_comma)
+            format.ostr << ", ";
+        format.ostr << (format.hilite ? IAST::hilite_keyword : "") << "DROP ALL PROFILES" << (format.hilite ? IAST::hilite_none : "");
+        need_comma = true;
+    }
+
+    if (drop_settings && !drop_settings->empty())
+    {
+        if (need_comma)
+            format.ostr << ", ";
+        formatSettingsProfileElementsForAlter("DROP", *drop_settings, format);
+        need_comma = true;
+    }
+
+    if (add_settings && !add_settings->empty())
+    {
+        if (need_comma)
+            format.ostr << ", ";
+        formatSettingsProfileElementsForAlter("ADD", *add_settings, format);
+        need_comma = true;
+    }
+
+    if (modify_settings && !modify_settings->empty())
+    {
+        if (need_comma)
+            format.ostr << ", ";
+        formatSettingsProfileElementsForAlter("MODIFY", *modify_settings, format);
+    }
+}
+
+void ASTAlterSettingsProfileElements::add(ASTAlterSettingsProfileElements && other)
+{
+    drop_all_settings |= other.drop_all_settings;
+    drop_all_profiles |= other.drop_all_profiles;
+
+    if (other.add_settings)
+    {
+        if (!add_settings)
+            add_settings = std::make_shared<ASTSettingsProfileElements>();
+        add_settings->add(std::move(*other.add_settings));
+    }
+
+    if (other.add_settings)
+    {
+        if (!add_settings)
+            add_settings = std::make_shared<ASTSettingsProfileElements>();
+        add_settings->add(std::move(*other.add_settings));
+    }
+
+    if (other.modify_settings)
+    {
+        if (!modify_settings)
+            modify_settings = std::make_shared<ASTSettingsProfileElements>();
+        modify_settings->add(std::move(*other.modify_settings));
+    }
+
+    if (other.drop_settings)
+    {
+        if (!drop_settings)
+            drop_settings = std::make_shared<ASTSettingsProfileElements>();
+        drop_settings->add(std::move(*other.drop_settings));
+    }
+}
+
 }

src/Parsers/Access/ASTSettingsProfileElement.h

@@ -39,10 +39,41 @@ public:
 
     bool empty() const;
 
+    size_t getNumberOfSettings() const;
+    size_t getNumberOfProfiles() const;
+
     String getID(char) const override { return "SettingsProfileElements"; }
-    ASTPtr clone() const override { return std::make_shared<ASTSettingsProfileElements>(*this); }
+    ASTPtr clone() const override;
     void formatImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const override;
 
     void setUseInheritKeyword(bool use_inherit_keyword_);
+
+    void add(ASTSettingsProfileElements && other);
 };
+
+/* Represents a clause used to alter settings or profiles assigned to a user or a role or another profile.
+ *     [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] [,...] ]
+ *     [DROP SETTINGS variable [,...] ]
+ *     [ADD PROFILES 'profile_name' [,...] ]
+ *     [DROP PROFILES 'profile_name' [,...] ]
+ *     [DROP ALL PROFILES]
+ *     [DROP ALL SETTINGS]
+*/
+class ASTAlterSettingsProfileElements : public IAST
+{
+public:
+    std::shared_ptr<ASTSettingsProfileElements> add_settings;
+    std::shared_ptr<ASTSettingsProfileElements> modify_settings;
+    std::shared_ptr<ASTSettingsProfileElements> drop_settings;
+
+    bool drop_all_settings = false;
+    bool drop_all_profiles = false;
+
+    String getID(char) const override;
+    ASTPtr clone() const override;
+    void formatImpl(const FormatSettings & format, FormatState &, FormatStateStacked) const override;
+
+    void add(ASTAlterSettingsProfileElements && other);
+};
+
 }

src/Parsers/Access/ParserCreateRoleQuery.cpp

@@ -25,20 +25,31 @@ namespace
         });
     }
 
-    bool parseSettings(IParserBase::Pos & pos, Expected & expected, bool id_mode, std::vector<std::shared_ptr<ASTSettingsProfileElement>> & settings)
+    bool parseSettings(IParserBase::Pos & pos, Expected & expected, bool id_mode, std::shared_ptr<ASTSettingsProfileElements> & settings)
     {
         return IParserBase::wrapParseImpl(pos, [&]
         {
-            if (!ParserKeyword{Keyword::SETTINGS}.ignore(pos, expected))
+            ASTPtr ast;
-                return false;
-
-            ASTPtr new_settings_ast;
             ParserSettingsProfileElements elements_p;
             elements_p.useIDMode(id_mode);
-            if (!elements_p.parse(pos, new_settings_ast, expected))
+            if (!elements_p.parse(pos, ast, expected))
                 return false;
 
-            settings = std::move(new_settings_ast->as<ASTSettingsProfileElements &>().elements);
+            settings = typeid_cast<std::shared_ptr<ASTSettingsProfileElements>>(ast);
+            return true;
+        });
+    }
+
+    bool parseAlterSettings(IParserBase::Pos & pos, Expected & expected, std::shared_ptr<ASTAlterSettingsProfileElements> & alter_settings)
+    {
+        return IParserBase::wrapParseImpl(pos, [&]
+        {
+            ASTPtr ast;
+            ParserAlterSettingsProfileElements elements_p;
+            if (!elements_p.parse(pos, ast, expected))
+                return false;
+
+            alter_settings = typeid_cast<std::shared_ptr<ASTAlterSettingsProfileElements>>(ast);
             return true;
         });
     }
@@ -91,6 +102,7 @@ bool ParserCreateRoleQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expec
 
     String new_name;
     std::shared_ptr<ASTSettingsProfileElements> settings;
+    std::shared_ptr<ASTAlterSettingsProfileElements> alter_settings;
     String cluster;
     String storage_name;
 
@@ -99,15 +111,28 @@ bool ParserCreateRoleQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expec
         if (alter && new_name.empty() && (names.size() == 1) && parseRenameTo(pos, expected, new_name))
             continue;
 
-        std::vector<std::shared_ptr<ASTSettingsProfileElement>> new_settings;
+        if (alter)
+        {
+            std::shared_ptr<ASTAlterSettingsProfileElements> new_alter_settings;
+            if (parseAlterSettings(pos, expected, new_alter_settings))
+            {
+                if (!alter_settings)
+                    alter_settings = std::make_shared<ASTAlterSettingsProfileElements>();
+                alter_settings->add(std::move(*new_alter_settings));
+                continue;
+            }
+        }
+        else
+        {
+            std::shared_ptr<ASTSettingsProfileElements> new_settings;
             if (parseSettings(pos, expected, attach_mode, new_settings))
             {
                 if (!settings)
                     settings = std::make_shared<ASTSettingsProfileElements>();
-
+                settings->add(std::move(*new_settings));
-            insertAtEnd(settings->elements, std::move(new_settings));
                 continue;
             }
+        }
 
         if (cluster.empty() && parseOnCluster(pos, expected, cluster))
             continue;
@@ -130,6 +155,7 @@ bool ParserCreateRoleQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expec
     query->names = std::move(names);
     query->new_name = std::move(new_name);
     query->settings = std::move(settings);
+    query->alter_settings = std::move(alter_settings);
     query->storage_name = std::move(storage_name);
 
     return true;

src/Parsers/Access/ParserCreateRoleQuery.h

@@ -11,7 +11,12 @@ namespace DB
   *
   * ALTER ROLE [IF EXISTS] name
   *     [RENAME TO new_name]
-  *     [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+  *     [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] [,...] ]
+  *     [DROP SETTINGS variable [,...] ]
+  *     [ADD PROFILES 'profile_name' [,...] ]
+  *     [DROP PROFILES 'profile_name' [,...] ]
+  *     [DROP ALL PROFILES]
+  *     [DROP ALL SETTINGS]
   */
 class ParserCreateRoleQuery : public IParserBase
 {

src/Parsers/Access/ParserCreateSettingsProfileQuery.cpp

@@ -27,20 +27,32 @@ namespace
         });
     }
 
-    bool parseSettings(IParserBase::Pos & pos, Expected & expected, bool id_mode, std::vector<std::shared_ptr<ASTSettingsProfileElement>> & settings)
+    bool parseSettings(IParserBase::Pos & pos, Expected & expected, bool id_mode, std::shared_ptr<ASTSettingsProfileElements> & settings)
     {
         return IParserBase::wrapParseImpl(pos, [&]
         {
-            if (!ParserKeyword{Keyword::SETTINGS}.ignore(pos, expected))
+            ASTPtr ast;
-                return false;
-
-            ASTPtr new_settings_ast;
             ParserSettingsProfileElements elements_p;
             elements_p.useInheritKeyword(true).useIDMode(id_mode);
-            if (!elements_p.parse(pos, new_settings_ast, expected))
+            if (!elements_p.parse(pos, ast, expected))
                 return false;
 
-            settings = std::move(new_settings_ast->as<ASTSettingsProfileElements &>().elements);
+            settings = typeid_cast<std::shared_ptr<ASTSettingsProfileElements>>(ast);
+            return true;
+        });
+    }
+
+    bool parseAlterSettings(IParserBase::Pos & pos, Expected & expected, std::shared_ptr<ASTAlterSettingsProfileElements> & alter_settings)
+    {
+        return IParserBase::wrapParseImpl(pos, [&]
+        {
+            ASTPtr ast;
+            ParserAlterSettingsProfileElements elements_p;
+            elements_p.useInheritKeyword(true);
+            if (!elements_p.parse(pos, ast, expected))
+                return false;
+
+            alter_settings = typeid_cast<std::shared_ptr<ASTAlterSettingsProfileElements>>(ast);
             return true;
         });
     }
@@ -111,6 +123,7 @@ bool ParserCreateSettingsProfileQuery::parseImpl(Pos & pos, ASTPtr & node, Expec
 
     String new_name;
     std::shared_ptr<ASTSettingsProfileElements> settings;
+    std::shared_ptr<ASTAlterSettingsProfileElements> alter_settings;
     String cluster;
     String storage_name;
 
@@ -119,15 +132,28 @@ bool ParserCreateSettingsProfileQuery::parseImpl(Pos & pos, ASTPtr & node, Expec
         if (alter && new_name.empty() && (names.size() == 1) && parseRenameTo(pos, expected, new_name))
             continue;
 
-        std::vector<std::shared_ptr<ASTSettingsProfileElement>> new_settings;
+        if (alter)
+        {
+            std::shared_ptr<ASTAlterSettingsProfileElements> new_alter_settings;
+            if (parseAlterSettings(pos, expected, new_alter_settings))
+            {
+                if (!alter_settings)
+                    alter_settings = std::make_shared<ASTAlterSettingsProfileElements>();
+                alter_settings->add(std::move(*new_alter_settings));
+                continue;
+            }
+        }
+        else
+        {
+            std::shared_ptr<ASTSettingsProfileElements> new_settings;
             if (parseSettings(pos, expected, attach_mode, new_settings))
             {
                 if (!settings)
                     settings = std::make_shared<ASTSettingsProfileElements>();
-
+                settings->add(std::move(*new_settings));
-            insertAtEnd(settings->elements, std::move(new_settings));
                 continue;
             }
+        }
 
         if (cluster.empty() && parseOnCluster(pos, expected, cluster))
             continue;
@@ -156,6 +182,7 @@ bool ParserCreateSettingsProfileQuery::parseImpl(Pos & pos, ASTPtr & node, Expec
     query->names = std::move(names);
     query->new_name = std::move(new_name);
     query->settings = std::move(settings);
+    query->alter_settings = std::move(alter_settings);
     query->to_roles = std::move(to_roles);
     query->storage_name = std::move(storage_name);
 

src/Parsers/Access/ParserCreateSettingsProfileQuery.h

@@ -11,7 +11,12 @@ namespace DB
   *
   * ALTER SETTINGS PROFILE [IF EXISTS] name
   *     [RENAME TO new_name]
-  *     [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | INHERIT 'profile_name'] [,...]
+  *     [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] [,...] ]
+  *     [DROP SETTINGS variable [,...] ]
+  *     [ADD PROFILES 'profile_name' [,...] ]
+  *     [DROP PROFILES 'profile_name' [,...] ]
+  *     [DROP ALL PROFILES]
+  *     [DROP ALL SETTINGS]
   */
 class ParserCreateSettingsProfileQuery : public IParserBase
 {

src/Parsers/Access/ParserCreateUserQuery.cpp

@@ -427,20 +427,31 @@ namespace
     }
 
 
-    bool parseSettings(IParserBase::Pos & pos, Expected & expected, bool id_mode, std::vector<std::shared_ptr<ASTSettingsProfileElement>> & settings)
+    bool parseSettings(IParserBase::Pos & pos, Expected & expected, bool id_mode, std::shared_ptr<ASTSettingsProfileElements> & settings)
     {
         return IParserBase::wrapParseImpl(pos, [&]
         {
-            if (!ParserKeyword{Keyword::SETTINGS}.ignore(pos, expected))
+            ASTPtr ast;
-                return false;
-
-            ASTPtr new_settings_ast;
             ParserSettingsProfileElements elements_p;
             elements_p.useIDMode(id_mode);
-            if (!elements_p.parse(pos, new_settings_ast, expected))
+            if (!elements_p.parse(pos, ast, expected))
                 return false;
 
-            settings = std::move(new_settings_ast->as<ASTSettingsProfileElements &>().elements);
+            settings = typeid_cast<std::shared_ptr<ASTSettingsProfileElements>>(ast);
+            return true;
+        });
+    }
+
+    bool parseAlterSettings(IParserBase::Pos & pos, Expected & expected, std::shared_ptr<ASTAlterSettingsProfileElements> & alter_settings)
+    {
+        return IParserBase::wrapParseImpl(pos, [&]
+        {
+            ASTPtr ast;
+            ParserAlterSettingsProfileElements elements_p;
+            if (!elements_p.parse(pos, ast, expected))
+                return false;
+
+            alter_settings = typeid_cast<std::shared_ptr<ASTAlterSettingsProfileElements>>(ast);
             return true;
         });
     }
@@ -556,6 +567,7 @@ bool ParserCreateUserQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expec
     std::vector<std::shared_ptr<ASTAuthenticationData>> auth_data;
     std::shared_ptr<ASTRolesOrUsersSet> default_roles;
     std::shared_ptr<ASTSettingsProfileElements> settings;
+    std::shared_ptr<ASTAlterSettingsProfileElements> alter_settings;
     std::shared_ptr<ASTRolesOrUsersSet> grantees;
     std::shared_ptr<ASTDatabaseOrNone> default_database;
     ASTPtr global_valid_until;
@@ -604,15 +616,28 @@ bool ParserCreateUserQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expec
             continue;
         }
 
-        std::vector<std::shared_ptr<ASTSettingsProfileElement>> new_settings;
+        if (alter)
+        {
+            std::shared_ptr<ASTAlterSettingsProfileElements> new_alter_settings;
+            if (parseAlterSettings(pos, expected, new_alter_settings))
+            {
+                if (!alter_settings)
+                    alter_settings = std::make_shared<ASTAlterSettingsProfileElements>();
+                alter_settings->add(std::move(*new_alter_settings));
+                continue;
+            }
+        }
+        else
+        {
+            std::shared_ptr<ASTSettingsProfileElements> new_settings;
             if (parseSettings(pos, expected, attach_mode, new_settings))
             {
                 if (!settings)
                     settings = std::make_shared<ASTSettingsProfileElements>();
-
+                settings->add(std::move(*new_settings));
-            insertAtEnd(settings->elements, std::move(new_settings));
                 continue;
             }
+        }
 
         if (!default_roles && parseDefaultRoles(pos, expected, attach_mode, default_roles))
             continue;
@@ -691,6 +716,7 @@ bool ParserCreateUserQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expec
     query->remove_hosts = std::move(remove_hosts);
     query->default_roles = std::move(default_roles);
     query->settings = std::move(settings);
+    query->alter_settings = std::move(alter_settings);
     query->grantees = std::move(grantees);
     query->default_database = std::move(default_database);
     query->global_valid_until = std::move(global_valid_until);

src/Parsers/Access/ParserCreateUserQuery.h

@@ -18,7 +18,12 @@ namespace DB
   *     [NOT IDENTIFIED | IDENTIFIED {[WITH {no_password|plaintext_password|sha256_password|sha256_hash|double_sha1_password|double_sha1_hash}] BY {'password'|'hash'}}|{WITH ldap SERVER 'server_name'}|{WITH kerberos [REALM 'realm']}]
   *     [[ADD|DROP] HOST {LOCAL | NAME 'name' | REGEXP 'name_regexp' | IP 'address' | LIKE 'pattern'} [,...] | ANY | NONE]
   *     [DEFAULT ROLE role [,...] | ALL | ALL EXCEPT role [,...] ]
-  *     [SETTINGS variable [= value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] | PROFILE 'profile_name'] [,...]
+  *     [ADD|MODIFY SETTINGS variable [=value] [MIN [=] min_value] [MAX [=] max_value] [CONST|READONLY|WRITABLE|CHANGEABLE_IN_READONLY] [,...] ]
+  *     [DROP SETTINGS variable [,...] ]
+  *     [ADD PROFILES 'profile_name' [,...] ]
+  *     [DROP PROFILES 'profile_name' [,...] ]
+  *     [DROP ALL PROFILES]
+  *     [DROP ALL SETTINGS]
   *     [GRANTEES {user | role | ANY | NONE} [,...] [EXCEPT {user | role} [,...]]]
   */
 class ParserCreateUserQuery : public IParserBase

src/Parsers/Access/ParserSettingsProfileElement.cpp

@@ -7,27 +7,13 @@
 #include <Parsers/ExpressionListParsers.h>
 #include <Parsers/parseIdentifierOrStringLiteral.h>
 #include <boost/algorithm/string/predicate.hpp>
+#include <base/insertAtEnd.h>
 
 
 namespace DB
 {
 namespace
 {
-    bool parseProfileKeyword(IParserBase::Pos & pos, Expected & expected, bool use_inherit_keyword)
-    {
-        if (ParserKeyword{Keyword::PROFILE}.ignore(pos, expected))
-            return true;
-
-        if (use_inherit_keyword && ParserKeyword{Keyword::INHERIT}.ignore(pos, expected))
-        {
-            ParserKeyword{Keyword::PROFILE}.ignore(pos, expected);
-            return true;
-        }
-
-        return false;
-    }
-
-
     bool parseProfileNameOrID(IParserBase::Pos & pos, Expected & expected, bool id_mode, String & res)
     {
         return IParserBase::wrapParseImpl(pos, [&]
@@ -119,6 +105,17 @@ namespace
     }
 
 
+    bool parseSettingName(IParserBase::Pos & pos, Expected & expected, String & res)
+    {
+        ASTPtr name_ast;
+        if (!ParserCompoundIdentifier{}.parse(pos, name_ast, expected))
+            return false;
+
+        res = getIdentifierName(name_ast);
+        return true;
+    }
+
+
     bool parseSettingNameWithValueOrConstraints(
         IParserBase::Pos & pos,
         Expected & expected,
@@ -130,11 +127,10 @@ namespace
     {
         return IParserBase::wrapParseImpl(pos, [&]
         {
-            ASTPtr name_ast;
+            String res_setting_name;
-            if (!ParserCompoundIdentifier{}.parse(pos, name_ast, expected))
+            if (!parseSettingName(pos, expected, res_setting_name))
                 return false;
 
-            String res_setting_name = getIdentifierName(name_ast);
             std::optional<Field> res_value;
             std::optional<Field> res_min_value;
             std::optional<Field> res_max_value;
@@ -169,52 +165,112 @@ namespace
     }
 
 
-    bool parseSettingsProfileElement(IParserBase::Pos & pos,
+    bool parseSettingsProfileElements(IParserBase::Pos & pos,
                                       Expected & expected,
                                       bool id_mode,
                                       bool use_inherit_keyword,
-                                     bool previous_element_was_parent_profile,
+                                      std::vector<std::shared_ptr<ASTSettingsProfileElement>> & res)
-                                     std::shared_ptr<ASTSettingsProfileElement> & result)
     {
-        return IParserBase::wrapParseImpl(pos, [&]
+        std::vector<std::shared_ptr<ASTSettingsProfileElement>> elements;
+        bool found_none = false;
+
+        bool expect_profiles = false;
+        bool expect_settings = false;
+
+        auto parse_element = [&]
+        {
+            if (ParserKeyword{Keyword::SETTINGS}.ignore(pos, expected) || ParserKeyword{Keyword::SETTING}.ignore(pos, expected))
+            {
+                expect_settings = true;
+            }
+
+            bool expect_settings_next = expect_settings;
+
+            if (ParserKeyword{Keyword::PROFILES}.ignore(pos, expected) || ParserKeyword{Keyword::PROFILE}.ignore(pos, expected))
+            {
+                expect_profiles = true;
+                expect_settings = false;
+            }
+            else if (use_inherit_keyword && ParserKeyword{Keyword::INHERIT}.ignore(pos, expected))
+            {
+                if (!ParserKeyword{Keyword::PROFILES}.ignore(pos, expected))
+                    ParserKeyword{Keyword::PROFILE}.ignore(pos, expected);
+                expect_profiles = true;
+                expect_settings = false;
+            }
+
+            if (!expect_profiles && !expect_settings)
+                return false;
+
+            if (ParserKeyword{Keyword::NONE}.ignore(pos, expected))
+            {
+                found_none = true;
+                expect_settings = expect_settings_next;
+                return true;
+            }
+
+            if (expect_settings)
             {
-            String parent_profile;
                 String setting_name;
                 std::optional<Field> value;
                 std::optional<Field> min_value;
                 std::optional<Field> max_value;
                 std::optional<SettingConstraintWritability> writability;
+                if (parseSettingNameWithValueOrConstraints(pos, expected, setting_name, value, min_value, max_value, writability))
+                {
+                    auto element = std::make_shared<ASTSettingsProfileElement>();
+                    element->setting_name = std::move(setting_name);
+                    element->value = std::move(value);
+                    element->min_value = std::move(min_value);
+                    element->max_value = std::move(max_value);
+                    element->writability = std::move(writability);
+                    elements.push_back(element);
+                    expect_profiles = false;
+                    expect_settings = expect_settings_next;
+                    return true;
+                }
+            }
 
-            bool ok = parseSettingNameWithValueOrConstraints(pos, expected, setting_name, value, min_value, max_value, writability);
+            if (expect_profiles)
+            {
+                String profile_name;
+                if (parseProfileNameOrID(pos, expected, id_mode, profile_name))
+                {
+                    auto element = std::make_shared<ASTSettingsProfileElement>();
+                    element->parent_profile = std::move(profile_name);
+                    element->id_mode = id_mode;
+                    element->use_inherit_keyword = use_inherit_keyword;
+                    elements.push_back(element);
+                    expect_settings = expect_settings_next;
+                    return true;
+                }
+            }
 
-            if (!ok && (parseProfileKeyword(pos, expected, use_inherit_keyword) || previous_element_was_parent_profile))
+            return false;
-                ok = parseProfileNameOrID(pos, expected, id_mode, parent_profile);
+        };
 
-            if (!ok)
+        if (!ParserList::parseUtil(pos, expected, parse_element, false))
             return false;
 
-            result = std::make_shared<ASTSettingsProfileElement>();
+        if (elements.empty() && !found_none)
-            result->parent_profile = std::move(parent_profile);
+            return false;
-            result->setting_name = std::move(setting_name);
+
-            result->value = std::move(value);
+        res = std::move(elements);
-            result->min_value = std::move(min_value);
-            result->max_value = std::move(max_value);
-            result->writability = writability;
-            result->id_mode = id_mode;
-            result->use_inherit_keyword = use_inherit_keyword;
         return true;
-        });
     }
 }
 
 
 bool ParserSettingsProfileElement::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 {
-    std::shared_ptr<ASTSettingsProfileElement> res;
+    std::vector<std::shared_ptr<ASTSettingsProfileElement>> elements;
-    if (!parseSettingsProfileElement(pos, expected, id_mode, use_inherit_keyword, false, res))
+    if (!parseSettingsProfileElements(pos, expected, id_mode, use_inherit_keyword, elements))
         return false;
 
-    node = res;
+    if (elements.size() != 1)
+        return false;
+
+    node = elements[0];
     return true;
 }
 
@@ -222,33 +278,157 @@ bool ParserSettingsProfileElement::parseImpl(Pos & pos, ASTPtr & node, Expected
 bool ParserSettingsProfileElements::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 {
     std::vector<std::shared_ptr<ASTSettingsProfileElement>> elements;
-
+    if (!parseSettingsProfileElements(pos, expected, id_mode, use_inherit_keyword, elements))
-    if (ParserKeyword{Keyword::NONE}.ignore(pos, expected))
-    {
-    }
-    else
-    {
-        bool previous_element_was_parent_profile = false;
-
-        auto parse_element = [&]
-        {
-            std::shared_ptr<ASTSettingsProfileElement> element;
-            if (!parseSettingsProfileElement(pos, expected, id_mode, use_inherit_keyword, previous_element_was_parent_profile, element))
         return false;
 
-            elements.push_back(element);
-            previous_element_was_parent_profile = !element->parent_profile.empty();
-            return true;
-        };
-
-        if (!ParserList::parseUtil(pos, expected, parse_element, false))
-            return false;
-    }
-
     auto result = std::make_shared<ASTSettingsProfileElements>();
     result->elements = std::move(elements);
     node = result;
     return true;
 }
 
+
+bool ParserAlterSettingsProfileElements::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
+{
+    std::vector<std::shared_ptr<ASTSettingsProfileElement>> add_settings;
+    std::vector<std::shared_ptr<ASTSettingsProfileElement>> modify_settings;
+    std::vector<std::shared_ptr<ASTSettingsProfileElement>> drop_settings;
+    bool drop_all_settings = false;
+    bool drop_all_profiles = false;
+
+    std::vector<std::shared_ptr<ASTSettingsProfileElement>> old_style_settings;
+    if (parseSettingsProfileElements(pos, expected, /* id_mode= */ false, use_inherit_keyword, old_style_settings))
+    {
+        /// old style: "SETTINGS ..." replaces all the settings ad profiles.
+        add_settings = std::move(old_style_settings);
+        drop_all_settings = true;
+        drop_all_profiles = true;
+    }
+    else
+    {
+        /// new style: "MODIFY SETTINGS ..., ADD PROFILES ..., DROP PROFILES ..., DROP SETTINGS ..."
+        std::string_view action;
+        std::string_view target;
+
+        auto parse_element = [&]
+        {
+            if (ParserKeyword{Keyword::ADD}.ignore(pos, expected))
+            {
+                action = "ADD";
+                target = "";
+            }
+            else if (ParserKeyword{Keyword::DROP}.ignore(pos, expected))
+            {
+                action = "DROP";
+                target = "";
+            }
+            else if (ParserKeyword{Keyword::MODIFY}.ignore(pos, expected))
+            {
+                action = "MODIFY";
+                target = "";
+            }
+
+            if (!action.empty())
+            {
+                if (ParserKeyword{Keyword::ALL_PROFILES}.ignore(pos, expected))
+                    target = "ALL PROFILES";
+                else if (ParserKeyword{Keyword::ALL_SETTINGS}.ignore(pos, expected))
+                    target = "ALL SETTINGS";
+                else if (ParserKeyword{Keyword::PROFILES}.ignore(pos, expected) || ParserKeyword{Keyword::PROFILE}.ignore(pos, expected))
+                    target = "PROFILES";
+                else if (ParserKeyword{Keyword::SETTINGS}.ignore(pos, expected) || ParserKeyword{Keyword::SETTING}.ignore(pos, expected))
+                    target = "SETTINGS";
+            }
+
+            if (target.empty())
+                return false;
+
+            if (target == "PROFILES")
+            {
+                auto element = std::make_shared<ASTSettingsProfileElement>();
+                if (!parseProfileNameOrID(pos, expected, /* id_mode= */ false, element->parent_profile))
+                    return false;
+                if (action == "ADD")
+                {
+                    add_settings.push_back(element);
+                    return true;
+                }
+                if (action == "DROP")
+                {
+                    drop_settings.push_back(element);
+                    return true;
+                }
+                return false;
+            }
+
+            if (target == "SETTINGS")
+            {
+                auto element = std::make_shared<ASTSettingsProfileElement>();
+                if (action == "ADD" || action == "MODIFY")
+                {
+                    if (!parseSettingNameWithValueOrConstraints(pos, expected, element->setting_name, element->value, element->min_value, element->max_value, element->writability))
+                        return false;
+                    if (action == "ADD")
+                        add_settings.push_back(element);
+                    else
+                        modify_settings.push_back(element);
+                    return true;
+                }
+                if (action == "DROP")
+                {
+                    ASTPtr name_ast;
+                    if (!ParserCompoundIdentifier{}.parse(pos, name_ast, expected))
+                        return false;
+                    element->setting_name = getIdentifierName(name_ast);
+                    drop_settings.push_back(element);
+                    return true;
+                }
+                return false;
+            }
+
+            if (action == "DROP" && target == "ALL PROFILES")
+            {
+                drop_all_profiles = true;
+                return true;
+            }
+
+            if (action == "DROP" && target == "ALL SETTINGS")
+            {
+                drop_all_settings = true;
+                return true;
+            }
+
+            return false;
+        };
+
+        if (!ParserList::parseUtil(pos, expected, parse_element, false))
+            return false;
+    }
+
+    if (add_settings.empty() && modify_settings.empty() && drop_settings.empty() && !drop_all_settings && !drop_all_profiles)
+        return false;
+
+    auto result = std::make_shared<ASTAlterSettingsProfileElements>();
+    if (!add_settings.empty())
+    {
+        result->add_settings = std::make_shared<ASTSettingsProfileElements>();
+        result->add_settings->elements = std::move(add_settings);
+    }
+    if (!modify_settings.empty())
+    {
+        result->modify_settings = std::make_shared<ASTSettingsProfileElements>();
+        result->modify_settings->elements = std::move(modify_settings);
+    }
+    if (!drop_settings.empty())
+    {
+        result->drop_settings = std::make_shared<ASTSettingsProfileElements>();
+        result->drop_settings->elements = std::move(drop_settings);
+    }
+    result->drop_all_settings = drop_all_settings;
+    result->drop_all_profiles = drop_all_profiles;
+
+    node = result;
+    return true;
+}
+
 }

src/Parsers/Access/ParserSettingsProfileElement.h

@@ -39,4 +39,18 @@ private:
     bool use_inherit_keyword = false;
 };
 
+
+class ParserAlterSettingsProfileElements : public IParserBase
+{
+public:
+    ParserAlterSettingsProfileElements & useInheritKeyword(bool use_inherit_keyword_ = true) { use_inherit_keyword = use_inherit_keyword_; return *this; }
+
+protected:
+    const char * getName() const override { return "AlterSettingsProfileElements"; }
+    bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
+
+private:
+    bool use_inherit_keyword = false;
+};
+
 }

src/Parsers/CommonParsers.h

@@ -10,22 +10,25 @@ namespace DB
 {
 
 #define APPLY_FOR_PARSER_KEYWORDS(MR_MACROS) \
+    MR_MACROS(ADD, "ADD") \
     MR_MACROS(ADD_COLUMN, "ADD COLUMN") \
     MR_MACROS(ADD_CONSTRAINT, "ADD CONSTRAINT") \
     MR_MACROS(ADD_INDEX, "ADD INDEX") \
     MR_MACROS(ADD_PROJECTION, "ADD PROJECTION") \
     MR_MACROS(ADD_STATISTICS, "ADD STATISTICS") \
-    MR_MACROS(ADD, "ADD") \
     MR_MACROS(ADMIN_OPTION_FOR, "ADMIN OPTION FOR") \
     MR_MACROS(AFTER, "AFTER") \
     MR_MACROS(ALGORITHM, "ALGORITHM") \
     MR_MACROS(ALIAS, "ALIAS") \
     MR_MACROS(ALL, "ALL") \
+    MR_MACROS(ALL_PROFILES, "ALL PROFILES") \
+    MR_MACROS(ALL_SETTINGS, "ALL SETTINGS") \
     MR_MACROS(ALTER_COLUMN, "ALTER COLUMN") \
     MR_MACROS(ALTER_DATABASE, "ALTER DATABASE") \
     MR_MACROS(ALTER_LIVE_VIEW, "ALTER LIVE VIEW") \
     MR_MACROS(ALTER_POLICY, "ALTER POLICY") \
     MR_MACROS(ALTER_PROFILE, "ALTER PROFILE") \
+    MR_MACROS(ALTER_PROFILES, "ALTER PROFILES") \
     MR_MACROS(ALTER_QUOTA, "ALTER QUOTA") \
     MR_MACROS(ALTER_ROLE, "ALTER ROLE") \
     MR_MACROS(ALTER_ROW_POLICY, "ALTER ROW POLICY") \
@@ -380,6 +383,7 @@ namespace DB
     MR_MACROS(PRIMARY_KEY, "PRIMARY KEY") \
     MR_MACROS(PRIMARY, "PRIMARY") \
     MR_MACROS(PROFILE, "PROFILE") \
+    MR_MACROS(PROFILES, "PROFILES") \
     MR_MACROS(PROJECTION, "PROJECTION") \
     MR_MACROS(PROTOBUF, "Protobuf") \
     MR_MACROS(PULL, "PULL") \
@@ -445,6 +449,7 @@ namespace DB
     MR_MACROS(SET_ROLE, "SET ROLE") \
     MR_MACROS(SET_TRANSACTION_SNAPSHOT, "SET TRANSACTION SNAPSHOT") \
     MR_MACROS(SET, "SET")                    \
+    MR_MACROS(SETTING, "SETTING") \
     MR_MACROS(SETTINGS, "SETTINGS") \
     MR_MACROS(SHOW_ACCESS, "SHOW ACCESS") \
     MR_MACROS(SHOW_CREATE, "SHOW CREATE") \

tests/queries/0_stateless/01294_create_settings_profile.reference

@@ -49,7 +49,7 @@ CREATE SETTINGS PROFILE `s4_01294` TO r1_01294
 CREATE SETTINGS PROFILE `s1_01294` SETTINGS readonly = 1
 CREATE SETTINGS PROFILE `s2_01294` SETTINGS readonly CONST
 CREATE SETTINGS PROFILE `s3_01294` SETTINGS INHERIT `readonly`
-CREATE SETTINGS PROFILE `s4_01294` SETTINGS INHERIT `readonly`, INHERIT `readonly`
+CREATE SETTINGS PROFILE `s4_01294` SETTINGS INHERIT `readonly`
 CREATE SETTINGS PROFILE `s5_01294` SETTINGS INHERIT `readonly`, readonly = 1
 CREATE SETTINGS PROFILE `s6_01294` SETTINGS INHERIT `readonly`, readonly CONST
 -- system.settings_profiles

tests/queries/0_stateless/02943_alter_user_modify_profiles.reference

@@ -0,0 +1,21 @@
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`, PROFILE `profile_b`
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_b`, PROFILE `profile_a`, PROFILE `profile_c`
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`, PROFILE `profile_d`
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_e`
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE ROLE test_role
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`, PROFILE `profile_b`
+CREATE ROLE test_role SETTINGS PROFILE `profile_b`, PROFILE `profile_a`, PROFILE `profile_c`
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`, PROFILE `profile_d`
+CREATE ROLE test_role SETTINGS PROFILE `profile_e`
+CREATE ROLE test_role
+CREATE SETTINGS PROFILE `test_profile`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`, INHERIT `profile_b`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_b`, INHERIT `profile_a`, INHERIT `profile_c`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`, INHERIT `profile_d`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_e`
+CREATE SETTINGS PROFILE `test_profile`

tests/queries/0_stateless/02943_alter_user_modify_profiles.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+test_user="test_user_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+test_role="test_role_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+test_profile="test_profile_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+
+profile_a="profile_a_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+profile_b="profile_b_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+profile_c="profile_c_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+profile_d="profile_d_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+profile_e="profile_e_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_a};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_b};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_c};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_d};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_e};"
+
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_a};"
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_b};"
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_c};"
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_d};"
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_e};"
+
+function show_create()
+{
+    local type="$1"
+    local name="$2"
+
+    $CLICKHOUSE_CLIENT -q "SHOW CREATE $type ${name};" | sed -e "s/${name}/test_${type}/g" -e "s/${profile_a}/profile_a/g" -e "s/${profile_b}/profile_b/g" -e "s/${profile_c}/profile_c/g" -e "s/${profile_d}/profile_d/g" -e "s/${profile_e}/profile_e/g"
+}
+
+function run_test()
+{
+    local type="$1"
+    local name="$2"
+
+    $CLICKHOUSE_CLIENT -q "DROP $type IF EXISTS ${name};"
+
+    $CLICKHOUSE_CLIENT -q "CREATE $type ${name};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD PROFILE ${profile_a};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD PROFILE ${profile_b};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD PROFILES ${profile_a}, ${profile_c};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD PROFILE ${profile_d} DROP PROFILES ${profile_b}, ${profile_c};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL PROFILES, ADD PROFILE ${profile_e};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL PROFILES;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "DROP $type ${name};"
+}
+
+run_test user ${test_user}
+run_test role ${test_role}
+run_test profile ${test_profile}
+
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_a};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_b};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_c};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_d};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_e};"

tests/queries/0_stateless/02943_alter_user_modify_profiles_and_settings.reference

@@ -0,0 +1,39 @@
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_x = 123, custom_t = 7, custom_s = \'str\'
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_a`, custom_x = 123, custom_t = 7, custom_s = \'str\'
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS PROFILE `profile_b`, PROFILE `profile_a`, custom_x = 321, custom_s = \'str\' CONST
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE ROLE test_role
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE ROLE test_role
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE ROLE test_role
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE ROLE test_role
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`, PROFILE `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE ROLE test_role
+CREATE ROLE test_role SETTINGS custom_x = 123, custom_t = 7, custom_s = \'str\'
+CREATE ROLE test_role SETTINGS PROFILE `profile_a`, custom_x = 123, custom_t = 7, custom_s = \'str\'
+CREATE ROLE test_role SETTINGS PROFILE `profile_b`, PROFILE `profile_a`, custom_x = 321, custom_s = \'str\' CONST
+CREATE ROLE test_role
+CREATE SETTINGS PROFILE `test_profile`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`, INHERIT `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE SETTINGS PROFILE `test_profile`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`, INHERIT `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE SETTINGS PROFILE `test_profile`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`, INHERIT `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE SETTINGS PROFILE `test_profile`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`, INHERIT `profile_b`, custom_x = 123, custom_y = 56.5, custom_w = \'www\'
+CREATE SETTINGS PROFILE `test_profile`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_x = 123, custom_t = 7, custom_s = \'str\'
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_a`, custom_x = 123, custom_t = 7, custom_s = \'str\'
+CREATE SETTINGS PROFILE `test_profile` SETTINGS INHERIT `profile_b`, INHERIT `profile_a`, custom_x = 321, custom_s = \'str\' CONST
+CREATE SETTINGS PROFILE `test_profile`

tests/queries/0_stateless/02943_alter_user_modify_profiles_and_settings.sh

@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+test_user="test_user_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+test_role="test_role_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+test_profile="test_profile_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+
+profile_a="profile_a_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+profile_b="profile_b_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+profile_c="profile_c_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_a};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_b};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE IF EXISTS ${profile_c};"
+
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_a};"
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_b};"
+$CLICKHOUSE_CLIENT -q "CREATE PROFILE ${profile_c};"
+
+function show_create()
+{
+    local type="$1"
+    local name="$2"
+
+    $CLICKHOUSE_CLIENT -q "SHOW CREATE $type ${name};" | sed -e "s/${name}/test_${type}/g" -e "s/${profile_a}/profile_a/g" -e "s/${profile_b}/profile_b/g" -e "s/${profile_c}/profile_c/g"
+}
+
+function run_test()
+{
+    local type="$1"
+    local name="$2"
+
+    $CLICKHOUSE_CLIENT -q "DROP $type IF EXISTS ${name};"
+
+    $CLICKHOUSE_CLIENT -q "CREATE $type ${name};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTINGS custom_x = 123, custom_y=56.5, custom_w='www', ADD PROFILES ${profile_a}, ${profile_b}"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL SETTINGS, DROP ALL PROFILES"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTINGS custom_x = 123, custom_y=56.5, custom_w='www', PROFILES ${profile_a}, ${profile_b}"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL SETTINGS, ALL PROFILES"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_x = 123, ADD SETTING custom_y=56.5, ADD SETTING custom_w='www', ADD PROFILE ${profile_a}, ADD PROFILE ${profile_b}"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL PROFILES, DROP ALL SETTINGS"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_x = 123 ADD SETTING custom_y=56.5 ADD SETTING custom_w='www' ADD PROFILE ${profile_a} ADD PROFILE ${profile_b}"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL SETTINGS DROP ALL PROFILES"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_x = 123, custom_t = 7, custom_s = 'str'"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD PROFILE ${profile_a}"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD PROFILE ${profile_b}, ${profile_a}, DROP SETTING custom_t, MODIFY SETTING custom_s READONLY, custom_x = 321"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL SETTINGS, ALL PROFILES"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "DROP $type ${name};"
+}
+
+run_test user ${test_user}
+run_test role ${test_role}
+run_test profile ${test_profile}
+
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_a};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_b};"
+$CLICKHOUSE_CLIENT -q "DROP PROFILE ${profile_c};"

tests/queries/0_stateless/02943_alter_user_modify_settings.reference

@@ -0,0 +1,42 @@
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_a = 100
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_a = 100, custom_b = 200
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_a = 100, custom_b = 300, custom_c = 400
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_b = 300, custom_c = 400, custom_d = 500
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 0 MAX 1000
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 0 MAX 2000
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 500 MAX 2000
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 700 MIN 500 MAX 2000
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 800 MIN 150
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_c = 400, custom_d = 500
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_c = 400, custom_d = 500, custom_x = 1, custom_y = 2
+CREATE USER test_user IDENTIFIED WITH no_password SETTINGS custom_z = 3
+CREATE USER test_user IDENTIFIED WITH no_password
+CREATE ROLE test_role
+CREATE ROLE test_role SETTINGS custom_a = 100
+CREATE ROLE test_role SETTINGS custom_a = 100, custom_b = 200
+CREATE ROLE test_role SETTINGS custom_a = 100, custom_b = 300, custom_c = 400
+CREATE ROLE test_role SETTINGS custom_b = 300, custom_c = 400, custom_d = 500
+CREATE ROLE test_role SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 0 MAX 1000
+CREATE ROLE test_role SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 0 MAX 2000
+CREATE ROLE test_role SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 500 MAX 2000
+CREATE ROLE test_role SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 700 MIN 500 MAX 2000
+CREATE ROLE test_role SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 800 MIN 150
+CREATE ROLE test_role SETTINGS custom_c = 400, custom_d = 500
+CREATE ROLE test_role SETTINGS custom_c = 400, custom_d = 500, custom_x = 1, custom_y = 2
+CREATE ROLE test_role SETTINGS custom_z = 3
+CREATE ROLE test_role
+CREATE SETTINGS PROFILE `test_profile`
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_a = 100
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_a = 100, custom_b = 200
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_a = 100, custom_b = 300, custom_c = 400
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_b = 300, custom_c = 400, custom_d = 500
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 0 MAX 1000
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 0 MAX 2000
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 600 MIN 500 MAX 2000
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 700 MIN 500 MAX 2000
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_b = 300, custom_c = 400, custom_d = 500, custom_e = 800 MIN 150
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_c = 400, custom_d = 500
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_c = 400, custom_d = 500, custom_x = 1, custom_y = 2
+CREATE SETTINGS PROFILE `test_profile` SETTINGS custom_z = 3
+CREATE SETTINGS PROFILE `test_profile`

tests/queries/0_stateless/02943_alter_user_modify_settings.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+test_user="test_user_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+test_role="test_role_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+test_profile="test_profile_02932_${CLICKHOUSE_DATABASE}_$RANDOM"
+
+function show_create()
+{
+    local type="$1"
+    local name="$2"
+
+    $CLICKHOUSE_CLIENT -q "SHOW CREATE $type ${name};" | sed "s/${name}/test_${type}/g"
+}
+
+function run_test()
+{
+    local type="$1"
+    local name="$2"
+
+    $CLICKHOUSE_CLIENT -q "DROP $type IF EXISTS ${name};"
+
+    $CLICKHOUSE_CLIENT -q "CREATE $type ${name};"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_a=100;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_b=200;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTINGS custom_b=300, custom_c=400;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_d=500 DROP SETTING custom_a;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_e=600 MIN 0 MAX 1000;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} MODIFY SETTING custom_e MAX 2000;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} MODIFY SETTING custom_e MIN 500;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} MODIFY SETTING custom_e=700;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} ADD SETTING custom_e=800 MIN 150;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP SETTINGS custom_b, custom_e;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} MODIFY SETTINGS custom_x=1, custom_y=2;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL SETTINGS, ADD SETTING custom_z=3;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "ALTER $type ${name} DROP ALL SETTINGS;"
+    show_create $type ${name}
+
+    $CLICKHOUSE_CLIENT -q "DROP $type ${name};"
+}
+
+run_test user ${test_user}
+run_test role ${test_role}
+run_test profile ${test_profile}