Wrong result of COUNT(distinct) with low tmp_table_size / max_heap_table_size, part #2

--source include/have_xtradb.inc

CREATE TABLE t1 (id INTEGER) ENGINE=InnoDB;

CREATE TABLE t2 (id INTEGER) ENGINE=InnoDB;

INSERT INTO t1 (id) VALUES (1), (1), (1),(1);

INSERT INTO t1 (id) SELECT id FROM t1;

INSERT INTO t1 (id) SELECT id FROM t1;

INSERT INTO t1 (id) SELECT id FROM t1;

INSERT INTO t1 (id) SELECT id FROM t1;

INSERT INTO t1 (id) SELECT id FROM t1;

INSERT INTO t1 SELECT id+1 FROM t1;

INSERT INTO t1 SELECT id+2 FROM t1;

INSERT INTO t1 SELECT id+4 FROM t1;

INSERT INTO t1 SELECT id+8 FROM t1;

INSERT INTO t1 SELECT id+16 FROM t1;

INSERT INTO t1 SELECT id+32 FROM t1;

INSERT INTO t1 SELECT id+64 FROM t1;

INSERT INTO t1 SELECT id+128 FROM t1;

INSERT INTO t1 SELECT id+256 FROM t1;

INSERT INTO t1 SELECT id+512 FROM t1;

INSERT INTO t1 SELECT id+1024 FROM t1;

INSERT INTO t1 SELECT id+2048 FROM t1;

INSERT INTO t1 SELECT id+4096 FROM t1;

INSERT INTO t1 SELECT id+8192 FROM t1;

INSERT INTO t2 SELECT id FROM t1 ORDER BY id*rand();

SET @tmp_table_size_saved = @@tmp_table_size;

SET @max_heap_table_size_saved = @@max_heap_table_size;

--echo # With default tmp_table_size / max_heap_table_size

SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

SET @@tmp_table_size=524288;

--echo # With reduced tmp_table_size

SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

SET @@tmp_table_size=@tmp_table_size_saved;

SET @@max_heap_table_size=524288;

--echo # With reduced max_heap_table_size

SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

SET @@max_heap_table_size=@max_heap_table_size_saved;

--echo # Back to default tmp_table_size / max_heap_table_size

SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

DROP TABLE t1, t2;

MariaDB [test]> --echo # With default tmp_table_size / max_heap_table_size

MariaDB [test]> SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

+-------+

| sm    |

+-------+

| 16384 |

+-------+

1 row in set (14.81 sec)

MariaDB [test]> SET @@tmp_table_size=524288;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> --echo # With reduced tmp_table_size

MariaDB [test]> SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

+----+

| sm |

+----+

|  0 |

+----+

1 row in set (14.85 sec)

MariaDB [test]> SET @@tmp_table_size=@tmp_table_size_saved;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> SET @@max_heap_table_size=524288;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> --echo # With reduced max_heap_table_size

MariaDB [test]> SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

+----+

| sm |

+----+

|  0 |

+----+

1 row in set (14.84 sec)

MariaDB [test]> SET @@max_heap_table_size=@max_heap_table_size_saved;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> --echo # Back to default tmp_table_size / max_heap_table_size

MariaDB [test]> SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;

+-------+

| sm    |

+-------+

| 16384 |

+-------+

1 row in set (14.84 sec)

revision-id: sergii@pisem.net-20130317104125-yyp99euwpir5ueho

revno: 3700

branch-nick: 5.5