diff --git a/dbms/src/Analyzers/AnalyzeResultOfQuery.cpp b/dbms/src/Analyzers/AnalyzeResultOfQuery.cpp
index 1a5bce62a654b8f1e26a5c4e7b732340646868e4..a0a65830b0cff26f9e86b339373fbc9f23b1e7a3 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 5d902353a6fa24fbd9020fbee0ec750497134fc3..218c2c8c339891c06ac63003c0a2ed5dff26a0bf 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 021ce8fb5d8a5890d4c044f108b51c07bd05cca1..0c6046bc50934cf92540123c2b0ceaf58c99381a 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 eba86a081f4d3c1c2a6e1355f2bcb182f1874f37..2d70f62be5fce4cc043e1774a5be4f4ce4d0600f 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 a860934e56be9def77a5f86fb5edea7c84208afe..6cd11510296a3818ca9f943e28eb0eecc228b4f3 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 39b85811f569ff8760528cbe0e8a4a15119ea391..6b5e23896a3911d2985753a55306b4459aae6d31 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 8f4aad3823146d1638f8752c1ac4a6ed87b7c9b8..6ca6ea4bdb2f1d91174e4a07f25df3530b3932be 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);