SET allow_experimental_analyzer = 0; SELECT count() > 3 FROM (EXPLAIN PIPELINE header = 1 SELECT * FROM system.numbers ORDER BY number DESC) WHERE explain LIKE '%Header: number UInt64%'; SELECT count() > 0 FROM (EXPLAIN PLAN SELECT * FROM system.numbers ORDER BY number DESC) WHERE explain ILIKE '%Sort%'; SELECT count() > 0 FROM (EXPLAIN SELECT * FROM system.numbers ORDER BY number DESC) WHERE explain ILIKE '%Sort%'; SELECT count() > 0 FROM (EXPLAIN CURRENT TRANSACTION); SELECT count() == 1 FROM (EXPLAIN SYNTAX SELECT number FROM system.numbers ORDER BY number DESC) WHERE explain ILIKE 'SELECT%'; SELECT trim(explain) == 'Asterisk' FROM (EXPLAIN AST SELECT * FROM system.numbers LIMIT 10) WHERE explain LIKE '%Asterisk%'; SELECT * FROM ( EXPLAIN AST SELECT * FROM ( EXPLAIN PLAN SELECT * FROM ( EXPLAIN SYNTAX SELECT trim(explain) == 'Asterisk' FROM ( EXPLAIN AST SELECT * FROM system.numbers LIMIT 10 ) WHERE explain LIKE '%Asterisk%' ) ) ) FORMAT Null; SELECT (EXPLAIN SYNTAX oneline = 1 SELECT 1) == 'SELECT 1'; SELECT * FROM viewExplain('', ''); -- { serverError BAD_ARGUMENTS } SELECT * FROM viewExplain('EXPLAIN AST', ''); -- { serverError BAD_ARGUMENTS } SELECT * FROM viewExplain('EXPLAIN AST', '', 1); -- { serverError BAD_ARGUMENTS } SELECT * FROM viewExplain('EXPLAIN AST', '', ''); -- { serverError BAD_ARGUMENTS } DROP TABLE IF EXISTS t1; CREATE TABLE t1 ( a UInt64 ) Engine = MergeTree ORDER BY tuple() AS SELECT number AS a FROM system.numbers LIMIT 100000; SELECT rows > 1000 FROM (EXPLAIN ESTIMATE SELECT sum(a) FROM t1); SELECT count() == 1 FROM (EXPLAIN ESTIMATE SELECT sum(a) FROM t1); DROP TABLE t1; SET allow_experimental_analyzer = 1; SELECT count() > 3 FROM (EXPLAIN PIPELINE header = 1 SELECT * FROM system.numbers ORDER BY number DESC) WHERE explain LIKE '%Header: \_\_table1.number UInt64%'; SELECT count() > 0 FROM (EXPLAIN PLAN SELECT * FROM system.numbers ORDER BY number DESC) WHERE explain ILIKE '%Sort%'; SELECT count() > 0 FROM (EXPLAIN SELECT * FROM system.numbers ORDER BY number DESC) WHERE explain ILIKE '%Sort%'; SELECT count() > 0 FROM (EXPLAIN CURRENT TRANSACTION); SELECT count() == 1 FROM (EXPLAIN SYNTAX SELECT number FROM system.numbers ORDER BY number DESC) WHERE explain ILIKE 'SELECT%'; SELECT trim(explain) == 'Asterisk' FROM (EXPLAIN AST SELECT * FROM system.numbers LIMIT 10) WHERE explain LIKE '%Asterisk%'; SELECT * FROM ( EXPLAIN AST SELECT * FROM ( EXPLAIN PLAN SELECT * FROM ( EXPLAIN SYNTAX SELECT trim(explain) == 'Asterisk' FROM ( EXPLAIN AST SELECT * FROM system.numbers LIMIT 10 ) WHERE explain LIKE '%Asterisk%' ) ) ) FORMAT Null; SELECT (EXPLAIN SYNTAX oneline = 1 SELECT 1) == 'SELECT 1 FROM system.one'; SELECT * FROM viewExplain('', ''); -- { serverError BAD_ARGUMENTS } SELECT * FROM viewExplain('EXPLAIN AST', ''); -- { serverError BAD_ARGUMENTS } SELECT * FROM viewExplain('EXPLAIN AST', '', 1); -- { serverError BAD_ARGUMENTS } SELECT * FROM viewExplain('EXPLAIN AST', '', ''); -- { serverError BAD_ARGUMENTS } -- EXPLAIN ESTIMATE is not supported in experimental analyzer