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--echo # --echo # MariaDB does not support group functions in some contexts where MySQL does --echo # CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (10),(20),(30); --echo # All these queries must pass, not returning "Invalid use of group function". (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)); (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)) LIMIT 1; (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)); (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)) LIMIT 1; (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)) ORDER BY a; (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)) ORDER BY a LIMIT 1; (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)) ORDER BY a; (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)) ORDER BY a LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)); SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)) LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)) ORDER BY a; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY GROUP_CONCAT(a)) ORDER BY a LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)); SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)) LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)) ORDER BY a; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,GROUP_CONCAT(a)) ORDER BY a LIMIT 1; (SELECT a FROM t1 GROUP BY a ORDER BY MAX(a)) ORDER BY a; (SELECT a FROM t1 GROUP BY a ORDER BY MAX(a)) ORDER BY a LIMIT 1; (SELECT a FROM t1 GROUP BY a ORDER BY a,MAX(a)) ORDER BY a; (SELECT a FROM t1 GROUP BY a ORDER BY a,MAX(a)) ORDER BY a LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY MAX(a)); SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY MAX(a)) LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY MAX(a)) ORDER BY a; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY MAX(a)) ORDER BY a LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,MAX(a)); SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,MAX(a)) LIMIT 1; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,MAX(a)) ORDER BY a; SELECT 1 AS a UNION (SELECT a FROM t1 GROUP BY a ORDER BY a,MAX(a)) ORDER BY a LIMIT 1; drop table t1;