Query parameter type : Identifier

src/Interpreters/ReplaceQueryParameterVisitor.cpp

@@ -5,8 +5,10 @@
 #include <DataTypes/DataTypeFactory.h>
 #include <Formats/FormatSettings.h>
 #include <IO/ReadBufferFromString.h>
+#include <Parsers/ASTIdentifier.h>
 #include <Parsers/ASTLiteral.h>
 #include <Parsers/ASTQueryParameter.h>
+#include <Interpreters/IdentifierSemantic.h>
 #include <Interpreters/ReplaceQueryParameterVisitor.h>
 #include <Interpreters/addTypeConversionToAST.h>
 
@@ -25,6 +27,8 @@ void ReplaceQueryParameterVisitor::visit(ASTPtr & ast)
 {
     if (ast->as<ASTQueryParameter>())
         visitQueryParameter(ast);
+    else if (ast->as<ASTIdentifier>())
+        visitIdentifier(ast);
     else
         visitChildren(ast);
 }
@@ -71,4 +75,27 @@ void ReplaceQueryParameterVisitor::visitQueryParameter(ASTPtr & ast)
     ast->setAlias(alias);
 }
 
+void ReplaceQueryParameterVisitor::visitIdentifier(ASTPtr & ast)
+{
+    auto & ast_identifier = ast->as<ASTIdentifier &>();
+    if (ast_identifier.children.empty())
+        return;
+
+    auto & name_parts = ast_identifier.name_parts;
+    for (size_t i = 0, j = 0, size = name_parts.size(); i < size; ++i)
+    {
+        if (name_parts[i].empty())
+        {
+            const auto & ast_param = ast_identifier.children[j++]->as<ASTQueryParameter &>();
+            name_parts[i] = getParamValue(ast_param.name);
+        }
+    }
+
+    if (!ast_identifier.semantic->special && name_parts.size() >= 2)
+        ast_identifier.semantic->table = ast_identifier.name_parts.end()[-2];
+
+    ast_identifier.resetFullName();
+    ast_identifier.children.clear();
+}
+
 }

src/Interpreters/ReplaceQueryParameterVisitor.h

@@ -9,6 +9,7 @@ namespace DB
 class ASTQueryParameter;
 
 /// Visit substitutions in a query, replace ASTQueryParameter with ASTLiteral.
+/// Rebuild ASTIdentifiers if some parts are ASTQueryParameter.
 class ReplaceQueryParameterVisitor
 {
 public:
@@ -21,6 +22,7 @@ public:
 private:
     const NameToNameMap & query_parameters;
     const String & getParamValue(const String & name);
+    void visitIdentifier(ASTPtr & ast);
     void visitQueryParameter(ASTPtr & ast);
     void visitChildren(ASTPtr & ast);
 };

src/Parsers/ASTIdentifier.cpp

@@ -16,26 +16,48 @@ namespace ErrorCodes
     extern const int SYNTAX_ERROR;
 }
 
-ASTIdentifier::ASTIdentifier(const String & short_name)
+ASTIdentifier::ASTIdentifier(const String & short_name, ASTPtr && name_param)
     : full_name(short_name), name_parts{short_name}, semantic(std::make_shared<IdentifierSemanticImpl>())
 {
-    assert(!full_name.empty());
+    if (name_param == nullptr)
+        assert(!full_name.empty());
+    else
+        children.push_back(std::move(name_param));
 }
 
-ASTIdentifier::ASTIdentifier(std::vector<String> && name_parts_, bool special)
+ASTIdentifier::ASTIdentifier(std::vector<String> && name_parts_, bool special, std::vector<ASTPtr> && name_params)
     : name_parts(name_parts_), semantic(std::make_shared<IdentifierSemanticImpl>())
 {
     assert(!name_parts.empty());
-    for (const auto & part [[maybe_unused]] : name_parts)
-        assert(!part.empty());
-
     semantic->special = special;
     semantic->legacy_compound = true;
+    if (!name_params.empty())
+    {
+        size_t params = 0;
+        for (const auto & part [[maybe_unused]] : name_parts)
+        {
+            if (part.empty())
+                ++params;
+        }
+        assert(params == name_params.size());
+        children = std::move(name_params);
+    }
+    else
+    {
+        for (const auto & part [[maybe_unused]] : name_parts)
+            assert(!part.empty());
 
-    if (!special && name_parts.size() >= 2)
-        semantic->table = name_parts.end()[-2];
+        if (!special && name_parts.size() >= 2)
+            semantic->table = name_parts.end()[-2];
 
-    resetFullName();
+        resetFullName();
+    }
+}
+
+ASTPtr ASTIdentifier::getParam() const
+{
+    assert(full_name.empty() && children.size() == 1);
+    return children.front()->clone();
 }
 
 ASTPtr ASTIdentifier::clone() const
@@ -64,13 +86,16 @@ void ASTIdentifier::setShortName(const String & new_name)
 
 const String & ASTIdentifier::name() const
 {
-    assert(!name_parts.empty());
-    assert(!full_name.empty());
+    if (children.empty())
+    {
+        assert(!name_parts.empty());
+        assert(!full_name.empty());
+    }
 
     return full_name;
 }
 
-void ASTIdentifier::formatImplWithoutAlias(const FormatSettings & settings, FormatState &, FormatStateStacked) const
+void ASTIdentifier::formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const
 {
     auto format_element = [&](const String & elem_name)
     {
@@ -82,17 +107,24 @@ void ASTIdentifier::formatImplWithoutAlias(const FormatSettings & settings, Form
     /// It could be compound but short
     if (!isShort())
     {
-        for (size_t i = 0, size = name_parts.size(); i < size; ++i)
+        for (size_t i = 0, j = 0, size = name_parts.size(); i < size; ++i)
         {
             if (i != 0)
                 settings.ostr << '.';
 
-            format_element(name_parts[i]);
+            if (name_parts[i].empty())
+                children[j++]->formatImpl(settings, state, frame);
+            else
+                format_element(name_parts[i]);
         }
     }
     else
     {
-        format_element(shortName());
+        const auto & name = shortName();
+        if (name.empty())
+            children.front()->formatImpl(settings, state, frame);
+        else
+            format_element(name);
     }
 }
 

src/Parsers/ASTIdentifier.h

@@ -2,6 +2,7 @@
 
 #include <optional>
 
+#include <Parsers/ASTQueryParameter.h>
 #include <Parsers/ASTWithAlias.h>
 #include <Core/UUID.h>
 
@@ -17,15 +18,19 @@ struct StorageID;
 /// Identifier (column, table or alias)
 class ASTIdentifier : public ASTWithAlias
 {
+    friend class ReplaceQueryParameterVisitor;
 public:
     UUID uuid = UUIDHelpers::Nil;
 
-    explicit ASTIdentifier(const String & short_name);
-    explicit ASTIdentifier(std::vector<String> && name_parts, bool special = false);
+    explicit ASTIdentifier(const String & short_name, ASTPtr && name_param = {});
+    explicit ASTIdentifier(std::vector<String> && name_parts, bool special = false, std::vector<ASTPtr> && name_params = {});
 
     /** Get the text that identifies this element. */
     String getID(char delim) const override { return "Identifier" + (delim + name()); }
 
+    /** Get the query param out of a non-compound identifier. */
+    ASTPtr getParam() const;
+
     ASTPtr clone() const override;
 
     void collectIdentifierNames(IdentifierNameSet & set) const override { set.insert(name()); }

src/Parsers/ExpressionElementParsers.cpp

@@ -146,7 +146,7 @@ bool ParserSubquery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 }
 
 
-bool ParserIdentifier::parseImpl(Pos & pos, ASTPtr & node, Expected &)
+bool ParserIdentifier::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 {
     /// Identifier in backquotes or in double quotes
     if (pos->type == TokenType::QuotedIdentifier)
@@ -172,7 +172,51 @@ bool ParserIdentifier::parseImpl(Pos & pos, ASTPtr & node, Expected &)
         ++pos;
         return true;
     }
+    else if (allow_query_parameter && pos->type == TokenType::OpeningCurlyBrace)
+    {
+        ++pos;
+        if (pos->type != TokenType::BareWord)
+        {
+            expected.add(pos, "substitution name (identifier)");
+            return false;
+        }
 
+        String name(pos->begin, pos->end);
+        ++pos;
+
+        if (pos->type != TokenType::Colon)
+        {
+            expected.add(pos, "colon between name and type");
+            return false;
+        }
+
+        ++pos;
+
+        if (pos->type != TokenType::BareWord)
+        {
+            expected.add(pos, "substitution type (identifier)");
+            return false;
+        }
+
+        String type(pos->begin, pos->end);
+        ++pos;
+
+        if (type != "Identifier")
+        {
+            expected.add(pos, "substitution type (identifier)");
+            return false;
+        }
+
+        if (pos->type != TokenType::ClosingCurlyBrace)
+        {
+            expected.add(pos, "closing curly brace");
+            return false;
+        }
+        ++pos;
+
+        node = std::make_shared<ASTIdentifier>("", std::make_shared<ASTQueryParameter>(name, type));
+        return true;
+    }
     return false;
 }
 
@@ -180,14 +224,19 @@ bool ParserIdentifier::parseImpl(Pos & pos, ASTPtr & node, Expected &)
 bool ParserCompoundIdentifier::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 {
     ASTPtr id_list;
-    if (!ParserList(std::make_unique<ParserIdentifier>(), std::make_unique<ParserToken>(TokenType::Dot), false)
-        .parse(pos, id_list, expected))
+    if (!ParserList(std::make_unique<ParserIdentifier>(allow_query_parameter), std::make_unique<ParserToken>(TokenType::Dot), false)
+             .parse(pos, id_list, expected))
         return false;
 
     std::vector<String> parts;
+    std::vector<ASTPtr> params;
     const auto & list = id_list->as<ASTExpressionList &>();
     for (const auto & child : list.children)
+    {
         parts.emplace_back(getIdentifierName(child));
+        if (parts.back() == "")
+            params.push_back(child->as<ASTIdentifier>()->getParam());
+    }
 
     ParserKeyword s_uuid("UUID");
     UUID uuid = UUIDHelpers::Nil;
@@ -201,7 +250,7 @@ bool ParserCompoundIdentifier::parseImpl(Pos & pos, ASTPtr & node, Expected & ex
         uuid = parseFromString<UUID>(ast_uuid->as<ASTLiteral>()->value.get<String>());
     }
 
-    node = std::make_shared<ASTIdentifier>(std::move(parts));
+    node = std::make_shared<ASTIdentifier>(std::move(parts), false, std::move(params));
     node->as<ASTIdentifier>()->uuid = uuid;
 
     return true;
@@ -1174,7 +1223,7 @@ bool ParserAlias::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 bool ParserColumnsMatcher::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 {
     ParserKeyword columns("COLUMNS");
-    ParserList columns_p(std::make_unique<ParserCompoundIdentifier>(), std::make_unique<ParserToken>(TokenType::Comma), false);
+    ParserList columns_p(std::make_unique<ParserCompoundIdentifier>(true), std::make_unique<ParserToken>(TokenType::Comma), false);
     ParserStringLiteral regex;
 
     if (!columns.ignore(pos, expected))
@@ -1252,7 +1301,7 @@ bool ParserColumnsTransformers::parseImpl(Pos & pos, ASTPtr & node, Expected & e
         auto parse_id = [&identifiers, &pos, &expected]
         {
             ASTPtr identifier;
-            if (!ParserIdentifier().parse(pos, identifier, expected))
+            if (!ParserIdentifier(true).parse(pos, identifier, expected))
                 return false;
 
             identifiers.emplace_back(std::move(identifier));
@@ -1338,7 +1387,7 @@ bool ParserAsterisk::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 
 bool ParserQualifiedAsterisk::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 {
-    if (!ParserCompoundIdentifier().parse(pos, node, expected))
+    if (!ParserCompoundIdentifier(false, true).parse(pos, node, expected))
         return false;
 
     if (pos->type != TokenType::Dot)
@@ -1475,7 +1524,7 @@ bool ParserExpressionElement::parseImpl(Pos & pos, ASTPtr & node, Expected & exp
         || ParserFunction().parse(pos, node, expected)
         || ParserQualifiedAsterisk().parse(pos, node, expected)
         || ParserAsterisk().parse(pos, node, expected)
-        || ParserCompoundIdentifier().parse(pos, node, expected)
+        || ParserCompoundIdentifier(false, true).parse(pos, node, expected)
         || ParserSubstitution().parse(pos, node, expected)
         || ParserMySQLGlobalVariable().parse(pos, node, expected);
 }

src/Parsers/ExpressionElementParsers.h

@@ -42,9 +42,12 @@ protected:
   */
 class ParserIdentifier : public IParserBase
 {
+public:
+    ParserIdentifier(bool allow_query_parameter_ = false) : allow_query_parameter(allow_query_parameter_) {}
 protected:
     const char * getName() const override { return "identifier"; }
     bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
+    bool allow_query_parameter;
 };
 
 
@@ -54,12 +57,16 @@ protected:
 class ParserCompoundIdentifier : public IParserBase
 {
 public:
-    ParserCompoundIdentifier(bool table_name_with_optional_uuid_ = false)
-    : table_name_with_optional_uuid(table_name_with_optional_uuid_) {}
+    ParserCompoundIdentifier(bool table_name_with_optional_uuid_ = false, bool allow_query_parameter_ = false)
+        : table_name_with_optional_uuid(table_name_with_optional_uuid_), allow_query_parameter(allow_query_parameter_)
+    {
+    }
+
 protected:
     const char * getName() const override { return "compound identifier"; }
     bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
     bool table_name_with_optional_uuid;
+    bool allow_query_parameter;
 };
 
 /// Just *
@@ -299,6 +306,17 @@ private:
 };
 
 
+/** Prepared statements.
+  * Parse query with parameter expression {name:type}.
+  */
+class ParserIdentifierOrSubstitution : public IParserBase
+{
+protected:
+    const char * getName() const override { return "identifier substitution"; }
+    bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
+};
+
+
 /** Prepared statements.
   * Parse query with parameter expression {name:type}.
   */

src/Parsers/ParserTablesInSelectQuery.cpp

@@ -23,7 +23,7 @@ bool ParserTableExpression::parseImpl(Pos & pos, ASTPtr & node, Expected & expec
 
     if (!ParserWithOptionalAlias(std::make_unique<ParserSubquery>(), true).parse(pos, res->subquery, expected)
         && !ParserWithOptionalAlias(std::make_unique<ParserFunction>(), true).parse(pos, res->table_function, expected)
-        && !ParserWithOptionalAlias(std::make_unique<ParserCompoundIdentifier>(), true).parse(pos, res->database_and_table_name, expected))
+        && !ParserWithOptionalAlias(std::make_unique<ParserCompoundIdentifier>(false, true), true).parse(pos, res->database_and_table_name, expected))
         return false;
 
     /// FINAL

tests/queries/0_stateless/01550_query_identifier_parameters.reference

@@ -0,0 +1,5 @@
+0
+0
+0
+0
+45

tests/queries/0_stateless/01550_query_identifier_parameters.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+. "$CURDIR"/../shell_config.sh
+
+$CLICKHOUSE_CLIENT --param_tbl 'numbers' --query 'select * from system.{tbl:Identifier} limit 1'
+$CLICKHOUSE_CLIENT --param_db 'system' --param_tbl 'numbers' --query 'select * from {db:Identifier}.{tbl:Identifier} limit 1'
+$CLICKHOUSE_CLIENT --param_col 'number' --query 'select {col:Identifier} from system.numbers limit 1'
+$CLICKHOUSE_CLIENT --param_col 'number' --query 'select a.{col:Identifier} from system.numbers a limit 1'
+$CLICKHOUSE_CLIENT --param_tbl 'numbers' --param_col 'number' --query 'select sum({tbl:Identifier}.{col:Identifier}) FROM (select * from system.{tbl:Identifier} limit 10) numbers'