diff --git a/dbms/src/Analyzers/AnalyzeResultOfQuery.cpp b/dbms/src/Analyzers/AnalyzeResultOfQuery.cpp
index 1a5bce62a65..a0a65830b0c 100644
--- a/dbms/src/Analyzers/AnalyzeResultOfQuery.cpp
+++ b/dbms/src/Analyzers/AnalyzeResultOfQuery.cpp
@@ -20,7 +20,7 @@ namespace ErrorCodes
 }
 
 
-void AnalyzeResultOfQuery::process(ASTPtr & ast, Context & context)
+void AnalyzeResultOfQuery::process(ASTPtr & ast, const Context & context)
 {
     const ASTSelectQuery * select = typeid_cast<const ASTSelectQuery *>(ast.get());
     if (!select)
diff --git a/dbms/src/Analyzers/AnalyzeResultOfQuery.h b/dbms/src/Analyzers/AnalyzeResultOfQuery.h
index 5d902353a6f..218c2c8c339 100644
--- a/dbms/src/Analyzers/AnalyzeResultOfQuery.h
+++ b/dbms/src/Analyzers/AnalyzeResultOfQuery.h
@@ -19,7 +19,7 @@ class Context;
   */
 struct AnalyzeResultOfQuery
 {
-    void process(ASTPtr & ast, Context & context);
+    void process(ASTPtr & ast, const Context & context);
 
     /// Block will have non-nullptr columns for constant expressions.
     Block result;
diff --git a/dbms/src/Analyzers/CollectAliases.h b/dbms/src/Analyzers/CollectAliases.h
index 021ce8fb5d8..0c6046bc509 100644
--- a/dbms/src/Analyzers/CollectAliases.h
+++ b/dbms/src/Analyzers/CollectAliases.h
@@ -31,9 +31,9 @@ struct CollectAliases
 
     enum class Kind
     {
-        Expression,        /// Example: SELECT a AS b, f(x) AS y
-        Table,            /// Example: SELECT t.* FROM (SELECT 1) AS t
-        ArrayJoin        /// Example: SELECT t.x.a FROM t ARRAY JOIN arr AS x
+        Expression, /// Example: SELECT a AS b, f(x) AS y
+        Table,      /// Example: SELECT t.* FROM (SELECT 1) AS t
+        ArrayJoin   /// Example: SELECT t.x.a FROM t ARRAY JOIN arr AS x
     };
 
     struct AliasInfo
diff --git a/dbms/src/Analyzers/CollectTables.cpp b/dbms/src/Analyzers/CollectTables.cpp
index eba86a081f4..2d70f62be5f 100644
--- a/dbms/src/Analyzers/CollectTables.cpp
+++ b/dbms/src/Analyzers/CollectTables.cpp
@@ -49,7 +49,7 @@ static CollectTables::TableInfo processOrdinaryTable(const ASTPtr & ast_database
 }
 
 
-static CollectTables::TableInfo processTableFunction(const ASTPtr & ast_table_function, Context & context)
+static CollectTables::TableInfo processTableFunction(const ASTPtr & ast_table_function, const Context & context)
 {
     const ASTFunction & function = typeid_cast<const ASTFunction &>(*ast_table_function);
 
@@ -78,7 +78,7 @@ static CollectTables::TableInfo processNoTables(const Context & context)
 }
 
 
-static CollectTables::TableInfo processSubquery(ASTPtr & ast_subquery, Context & context)
+static CollectTables::TableInfo processSubquery(ASTPtr & ast_subquery, const Context & context)
 {
     AnalyzeResultOfQuery analyzer;
     analyzer.process(typeid_cast<ASTSubquery &>(*ast_subquery).children.at(0), context);
@@ -91,7 +91,7 @@ static CollectTables::TableInfo processSubquery(ASTPtr & ast_subquery, Context &
 }
 
 
-void CollectTables::process(ASTPtr & ast, Context & context, const CollectAliases & aliases)
+void CollectTables::process(ASTPtr & ast, const Context & context, const CollectAliases & aliases)
 {
     const ASTSelectQuery * select = typeid_cast<const ASTSelectQuery *>(ast.get());
     if (!select)
diff --git a/dbms/src/Analyzers/CollectTables.h b/dbms/src/Analyzers/CollectTables.h
index a860934e56b..6cd11510296 100644
--- a/dbms/src/Analyzers/CollectTables.h
+++ b/dbms/src/Analyzers/CollectTables.h
@@ -24,7 +24,7 @@ class WriteBuffer;
   */
 struct CollectTables
 {
-    void process(ASTPtr & ast, Context & context, const CollectAliases & aliases);
+    void process(ASTPtr & ast, const Context & context, const CollectAliases & aliases);
 
     enum class Kind
     {
diff --git a/dbms/src/Analyzers/TypeAndConstantInference.cpp b/dbms/src/Analyzers/TypeAndConstantInference.cpp
index 39b85811f56..6b5e23896a3 100644
--- a/dbms/src/Analyzers/TypeAndConstantInference.cpp
+++ b/dbms/src/Analyzers/TypeAndConstantInference.cpp
@@ -56,7 +56,7 @@ using LambdaParameters = std::unordered_map<String, DataTypePtr>;
 
 
 void processImpl(
-    ASTPtr & ast, Context & context,
+    ASTPtr & ast, const Context & context,
     CollectAliases & aliases, const AnalyzeColumns & columns,
     TypeAndConstantInference::Info & info,
     const AnalyzeLambdas & lambdas);
@@ -76,7 +76,7 @@ void processLiteral(const String & column_name, const ASTPtr & ast, TypeAndConst
 
 
 void processIdentifier(const String & column_name, const ASTPtr & ast, TypeAndConstantInference::Info & info,
-    Context & context, CollectAliases & aliases, const AnalyzeColumns & columns,
+    const Context & context, CollectAliases & aliases, const AnalyzeColumns & columns,
     const AnalyzeLambdas & lambdas)
 {
     /// Column from table
@@ -258,7 +258,7 @@ void processFunction(const String & column_name, ASTPtr & ast, TypeAndConstantIn
 
 
 void processScalarSubquery(const String & column_name, ASTPtr & ast, TypeAndConstantInference::Info & info,
-    Context & context)
+    const Context & context)
 {
     ASTSubquery * subquery = static_cast<ASTSubquery *>(ast.get());
 
@@ -316,7 +316,7 @@ void processScalarSubquery(const String & column_name, ASTPtr & ast, TypeAndCons
 
 
 void processHigherOrderFunction(const String & column_name,
-    ASTPtr & ast, Context & context,
+    ASTPtr & ast, const Context & context,
     CollectAliases & aliases, const AnalyzeColumns & columns,
     TypeAndConstantInference::Info & info,
     const AnalyzeLambdas & lambdas)
@@ -395,7 +395,7 @@ void processHigherOrderFunction(const String & column_name,
 
 
 void processImpl(
-    ASTPtr & ast, Context & context,
+    ASTPtr & ast, const Context & context,
     CollectAliases & aliases, const AnalyzeColumns & columns,
     TypeAndConstantInference::Info & info,
     const AnalyzeLambdas & lambdas)
@@ -468,7 +468,7 @@ void processImpl(
 }
 
 
-void TypeAndConstantInference::process(ASTPtr & ast, Context & context,
+void TypeAndConstantInference::process(ASTPtr & ast, const Context & context,
     CollectAliases & aliases, const AnalyzeColumns & columns, const AnalyzeLambdas & lambdas)
 {
     processImpl(ast, context, aliases, columns, info, lambdas);
diff --git a/dbms/src/Analyzers/TypeAndConstantInference.h b/dbms/src/Analyzers/TypeAndConstantInference.h
index 8f4aad38231..6ca6ea4bdb2 100644
--- a/dbms/src/Analyzers/TypeAndConstantInference.h
+++ b/dbms/src/Analyzers/TypeAndConstantInference.h
@@ -30,7 +30,7 @@ class IAggregateFunction;
   */
 struct TypeAndConstantInference
 {
-    void process(ASTPtr & ast, Context & context,
+    void process(ASTPtr & ast, const Context & context,
         CollectAliases & aliases,
         const AnalyzeColumns & columns,
         const AnalyzeLambdas & analyze_lambdas);