Merge pull request #70593 from jsc0218/InsertWith

With Insert Support

docs/en/sql-reference/statements/insert-into.md

@@ -121,6 +121,14 @@ However, you can delete old data using `ALTER TABLE ... DROP PARTITION`.
 
 To insert a default value instead of `NULL` into a column with not nullable data type, enable [insert_null_as_default](../../operations/settings/settings.md#insert_null_as_default) setting.
 
+`INSERT` also supports CTE(common table expression). For example, the following two statements are equivalent:
+
+``` sql
+INSERT INTO x WITH y AS (SELECT * FROM numbers(10)) SELECT * FROM y;
+WITH y AS (SELECT * FROM numbers(10)) INSERT INTO x SELECT * FROM y;
+```
+
+
 ## Inserting Data from a File
 
 **Syntax**

src/Parsers/ParserInsertQuery.cpp

@@ -1,5 +1,6 @@
 #include <Parsers/ASTIdentifier_fwd.h>
 #include <Parsers/ASTInsertQuery.h>
+#include <Parsers/ASTSelectQuery.h>
 #include <Parsers/ASTSelectWithUnionQuery.h>
 
 #include <Parsers/CommonParsers.h>
@@ -7,6 +8,7 @@
 #include <Parsers/ExpressionListParsers.h>
 #include <Parsers/ParserSelectWithUnionQuery.h>
 #include <Parsers/ParserWatchQuery.h>
+#include <Parsers/ParserWithElement.h>
 #include <Parsers/ParserInsertQuery.h>
 #include <Parsers/ParserSetQuery.h>
 #include <Parsers/InsertQuerySettingsPushDownVisitor.h>
@@ -58,10 +60,20 @@ bool ParserInsertQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
     ASTPtr settings_ast;
     ASTPtr partition_by_expr;
     ASTPtr compression;
+    ASTPtr with_expression_list;
 
     /// Insertion data
     const char * data = nullptr;
 
+    if (s_with.ignore(pos, expected))
+    {
+        if (!ParserList(std::make_unique<ParserWithElement>(), std::make_unique<ParserToken>(TokenType::Comma))
+            .parse(pos, with_expression_list, expected))
+            return false;
+        if (with_expression_list->children.empty())
+            return false;
+    }
+
     /// Check for key words `INSERT INTO`. If it isn't found, the query can't be parsed as insert query.
     if (!s_insert_into.ignore(pos, expected))
         return false;
@@ -162,7 +174,7 @@ bool ParserInsertQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
 
         tryGetIdentifierNameInto(format, format_str);
     }
-    else if (s_select.ignore(pos, expected) || s_with.ignore(pos,expected))
+    else if (s_select.ignore(pos, expected) || s_with.ignore(pos, expected))
     {
         /// If SELECT is defined, return to position before select and parse
         /// rest of query as SELECT query.
@@ -170,6 +182,19 @@ bool ParserInsertQuery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
         ParserSelectWithUnionQuery select_p;
         select_p.parse(pos, select, expected);
 
+        if (with_expression_list)
+        {
+            const auto & children = select->as<ASTSelectWithUnionQuery>()->list_of_selects->children;
+            for (const auto & child : children)
+            {
+                if (child->as<ASTSelectQuery>()->getExpression(ASTSelectQuery::Expression::WITH, false))
+                    throw Exception(ErrorCodes::SYNTAX_ERROR,
+                        "Only one WITH should be presented, either before INSERT or SELECT.");
+                child->as<ASTSelectQuery>()->setExpression(ASTSelectQuery::Expression::WITH,
+                    std::move(with_expression_list));
+            }
+        }
+
         /// FORMAT section is expected if we have input() in SELECT part
         if (s_format.ignore(pos, expected) && !name_p.parse(pos, format, expected))
             return false;

tests/queries/0_stateless/03248_with_insert.reference

@@ -0,0 +1,20 @@
+0
+1
+2
+3
+4
+0
+1
+2
+3
+4
+2025-01-01
+2026-01-01
+2027-01-01
+2028-01-01
+2029-01-01
+2030-01-01
+2031-01-01
+2032-01-01
+2033-01-01
+2034-01-01

tests/queries/0_stateless/03248_with_insert.sql

@@ -0,0 +1,49 @@
+DROP TABLE IF EXISTS x;
+
+CREATE TABLE x ENGINE = Log AS SELECT * FROM numbers(0);
+
+SYSTEM STOP MERGES x;
+
+WITH y AS
+    (
+        SELECT *
+        FROM numbers(10)
+    )
+INSERT INTO x
+SELECT *
+FROM y
+INTERSECT
+SELECT *
+FROM numbers(5);
+
+WITH y AS
+    (
+        SELECT *
+        FROM numbers(10)
+    )
+INSERT INTO x
+SELECT *
+FROM numbers(5)
+INTERSECT
+SELECT *
+FROM y;
+
+SELECT * FROM x;
+
+DROP TABLE x;
+
+CREATE TABLE x (d date) ENGINE = Log;
+
+WITH y AS
+    (
+        SELECT
+            number,
+            date_add(YEAR, number, toDate('2025-01-01')) AS new_date
+        FROM numbers(10)
+    )
+INSERT INTO x
+SELECT y.new_date FROM y;
+
+SELECT * FROM x;
+
+DROP TABLE x;

tests/queries/0_stateless/03248_with_insert_with.reference

@@ -0,0 +1 @@
+Only one WITH should be presented, either before INSERT or SELECT

tests/queries/0_stateless/03248_with_insert_with.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CUR_DIR"/../shell_config.sh
+
+$CLICKHOUSE_CLIENT -q 'DROP TABLE IF EXISTS x'
+$CLICKHOUSE_CLIENT -q 'CREATE TABLE x ENGINE = Log AS SELECT * FROM numbers(0)'
+$CLICKHOUSE_CLIENT -q 'WITH y AS ( SELECT * FROM numbers(10) ) INSERT INTO x WITH y2 AS ( SELECT * FROM numbers(10) ) SELECT * FROM y;' |& grep --max-count 1 -F --only-matching "Only one WITH should be presented, either before INSERT or SELECT"
+$CLICKHOUSE_CLIENT -q 'DROP TABLE x'