Fix CTE in view.

src/Interpreters/ApplyWithSubqueryVisitor.cpp

@@ -13,9 +13,22 @@ namespace DB
 void ApplyWithSubqueryVisitor::visit(ASTPtr & ast, const Data & data)
 {
     if (auto * node_select = ast->as<ASTSelectQuery>())
+        visit(*node_select, data);
+    else
     {
+        for (auto & child : ast->children)
+            visit(child, data);
+        if (auto * node_func = ast->as<ASTFunction>())
+            visit(*node_func, data);
+        else if (auto * node_table = ast->as<ASTTableExpression>())
+            visit(*node_table, data);
+    }
+}
+
+void ApplyWithSubqueryVisitor::visit(ASTSelectQuery & ast, const Data & data)
+{
     std::optional<Data> new_data;
-        if (auto with = node_select->with())
+    if (auto with = ast.with())
     {
         for (auto & child : with->children)
         {
@@ -29,21 +42,17 @@ void ApplyWithSubqueryVisitor::visit(ASTPtr & ast, const Data & data)
         }
     }
 
-        for (auto & child : node_select->children)
+    for (auto & child : ast.children)
     {
-            if (child != node_select->with())
+        if (child != ast.with())
             visit(child, new_data ? *new_data : data);
     }
-    }
-    else
-    {
-        for (auto & child : ast->children)
+}
+
+void ApplyWithSubqueryVisitor::visit(ASTSelectWithUnionQuery & ast, const Data & data)
+{
+    for (auto & child : ast.children)
         visit(child, data);
-        if (auto * node_func = ast->as<ASTFunction>())
-            visit(*node_func, data);
-        else if (auto * node_table = ast->as<ASTTableExpression>())
-            visit(*node_table, data);
-    }
 }
 
 void ApplyWithSubqueryVisitor::visit(ASTTableExpression & table, const Data & data)

src/Interpreters/ApplyWithSubqueryVisitor.h

@@ -7,6 +7,8 @@
 namespace DB
 {
 class ASTFunction;
+class ASTSelectQuery;
+class ASTSelectWithUnionQuery;
 struct ASTTableExpression;
 
 class ApplyWithSubqueryVisitor
@@ -18,9 +20,13 @@ public:
     };
 
     static void visit(ASTPtr & ast) { visit(ast, {}); }
+    static void visit(ASTSelectQuery & select) { visit(select, {}); }
+    static void visit(ASTSelectWithUnionQuery & select) { visit(select, {}); }
 
 private:
     static void visit(ASTPtr & ast, const Data & data);
+    static void visit(ASTSelectQuery & ast, const Data & data);
+    static void visit(ASTSelectWithUnionQuery & ast, const Data & data);
     static void visit(ASTTableExpression & table, const Data & data);
     static void visit(ASTFunction & func, const Data & data);
 };

src/Interpreters/InterpreterCreateQuery.cpp

@@ -59,6 +59,7 @@
 #include <Interpreters/QueryLog.h>
 #include <Interpreters/addTypeConversionToAST.h>
 #include <Interpreters/FunctionNameNormalizer.h>
+#include <Interpreters/ApplyWithSubqueryVisitor.h>
 
 #include <TableFunctions/TableFunctionFactory.h>
 #include <common/logger_useful.h>
@@ -887,6 +888,8 @@ BlockIO InterpreterCreateQuery::createTable(ASTCreateQuery & create)
 
     if (create.select && create.isView())
     {
+        // Expand CTE before filling default database
+        ApplyWithSubqueryVisitor().visit(*create.select);
         AddDefaultDatabaseVisitor visitor(current_database);
         visitor.visit(*create.select);
     }

tests/queries/0_stateless/01711_cte_subquery_fix.sql

@@ -1,3 +1,7 @@
 drop table if exists t;
 create table t engine = Memory as with cte as (select * from numbers(10)) select * from cte;
 drop table t;
+
+drop table if exists view1;
+create view view1 as with t as (select number n from numbers(3)) select n from t;
+drop table view1;