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Merge pull request #72157 from ClickHouse/backport/24.9/71982

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Backport #71982 to 24.9: Allow only SELECT queries in EXPLAIN AST used inside subquery
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robot-ch-test-poll3 2024-11-20 17:10:24 +01:00 committed by GitHub
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3 changed files with 19 additions and 0 deletions
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3
src/Parsers/ExpressionElementParsers.cpp
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@ -140,6 +140,9 @@ bool ParserSubquery::parseImpl(Pos & pos, ASTPtr & node, Expected & expected)
const ASTPtr & explained_ast = explain_query.getExplainedQuery(); const ASTPtr & explained_ast = explain_query.getExplainedQuery();
if (explained_ast) if (explained_ast)
{ {
if (!explained_ast->as<ASTSelectWithUnionQuery>())
throw Exception(ErrorCodes::BAD_ARGUMENTS, "EXPLAIN inside subquery supports only SELECT queries");
auto view_explain = makeASTFunction("viewExplain", auto view_explain = makeASTFunction("viewExplain",
std::make_shared<ASTLiteral>(kind_str), std::make_shared<ASTLiteral>(kind_str),
std::make_shared<ASTLiteral>(settings_str), std::make_shared<ASTLiteral>(settings_str),

11
tests/queries/0_stateless/03273_select_from_explain_ast_non_select.reference Normal file
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@ -0,0 +1,11 @@
SelectWithUnionQuery (children 1)
ExpressionList (children 1)
SelectQuery (children 2)
ExpressionList (children 1)
Asterisk
TablesInSelectQuery (children 1)
TablesInSelectQueryElement (children 1)
TableExpression (children 1)
Function numbers (children 1)
ExpressionList (children 1)
Literal UInt64_10

5
tests/queries/0_stateless/03273_select_from_explain_ast_non_select.sql Normal file
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@ -0,0 +1,5 @@
SELECT * FROM ( EXPLAIN AST SELECT * FROM numbers(10) );
SELECT * FROM ( EXPLAIN AST CREATE TABLE test ENGINE=Memory ); -- {clientError BAD_ARGUMENTS}
SELECT * FROM ( EXPLAIN AST CREATE MATERIALIZED VIEW mv (data String) AS SELECT data FROM table ); -- {clientError BAD_ARGUMENTS}
SELECT * FROM ( EXPLAIN AST INSERT INTO TABLE test VALUES); -- {clientError BAD_ARGUMENTS}
SELECT * FROM ( EXPLAIN AST ALTER TABLE test MODIFY COLUMN x UInt32 ); -- {clientError BAD_ARGUMENTS}