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--echo #
--echo # Bug 20219846: EXPLAIN FOR LIMIT QUERY SHOWS FILESORT BUT EXECUTION
--echo # IS DONE WITH INDEX ONLY
--echo #
CREATE TABLE t0 (
i0 INTEGER NOT NULL
);
INSERT INTO t0 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
CREATE TABLE t1 (
pk INTEGER PRIMARY KEY,
i1 INTEGER NOT NULL,
i2 INTEGER NOT NULL,
INDEX k1 (i1)
) ENGINE=InnoDB;
INSERT INTO t1
SELECT a0.i0 + 10*a1.i0 + 100*a2.i0,
(a0.i0 + 10*a1.i0 + 100*a2.i0) % 50,
a0.i0 + 10*a1.i0 + 100*a2.i0
FROM t0 AS a0, t0 AS a1, t0 AS a2;
CREATE TABLE t2 (
pk INTEGER PRIMARY KEY,
i1 INTEGER NOT NULL,
i2 INTEGER NOT NULL,
INDEX k1 (i1)
) ENGINE=InnoDB;
INSERT INTO t2
SELECT a0.i0 + 10*a1.i0 + 100*a2.i0,
(a0.i0 + 10*a1.i0 + 100*a2.i0) % 500,
a0.i0 + 10*a1.i0 + 100*a2.i0
FROM t0 AS a0, t0 AS a1, t0 AS a2;
ANALYZE TABLE t1,t2;
let query=
SELECT *
FROM t1 JOIN t2 ON t1.i1=t2.i1
WHERE t2.i2 > 3
ORDER BY t1.i1 LIMIT 20;
--echo # Explain should show "Using filesort"
eval EXPLAIN $query;
FLUSH STATUS;
eval $query;
--echo # Status from execution should show that filesort was used
SHOW STATUS LIKE 'Sort%';
DROP TABLE t0, t1, t2;