mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 03:52:35 +01:00
135 lines
2.8 KiB
Text
135 lines
2.8 KiB
Text
set @save_tmp_table_size=@@tmp_table_size;
|
|
set @save_max_heap_table_size=@@max_heap_table_size;
|
|
set default_storage_engine=MYISAM;
|
|
CREATE TABLE t1 (id INTEGER);
|
|
CREATE TABLE t2 (id INTEGER);
|
|
INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_1_to_1024 b;
|
|
SELECT AVG(DISTINCT id) FROM t1 GROUP BY id % 13;
|
|
AVG(DISTINCT id)
|
|
513.5000
|
|
508.0000
|
|
509.0000
|
|
510.0000
|
|
511.0000
|
|
512.0000
|
|
513.0000
|
|
514.0000
|
|
515.0000
|
|
516.0000
|
|
517.0000
|
|
511.5000
|
|
512.5000
|
|
SELECT SUM(DISTINCT id)/COUNT(DISTINCT id) FROM t1 GROUP BY id % 13;
|
|
SUM(DISTINCT id)/COUNT(DISTINCT id)
|
|
513.5000
|
|
508.0000
|
|
509.0000
|
|
510.0000
|
|
511.0000
|
|
512.0000
|
|
513.0000
|
|
514.0000
|
|
515.0000
|
|
516.0000
|
|
517.0000
|
|
511.5000
|
|
512.5000
|
|
INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_1025_to_16384 b;
|
|
INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a,seq_1_to_16384 b
|
|
ORDER by (a.seq*0+b.seq)*rand();
|
|
SELECT SUM(DISTINCT id) sm FROM t1;
|
|
sm
|
|
134225920
|
|
SELECT SUM(DISTINCT id) sm FROM t2;
|
|
sm
|
|
134225920
|
|
SELECT SUM(DISTINCT id) sm FROM t1 group by id % 13;
|
|
sm
|
|
10327590
|
|
10328851
|
|
10330112
|
|
10331373
|
|
10332634
|
|
10317510
|
|
10318770
|
|
10320030
|
|
10321290
|
|
10322550
|
|
10323810
|
|
10325070
|
|
10326330
|
|
SET max_heap_table_size=16384;
|
|
SHOW variables LIKE 'max_heap_table_size';
|
|
Variable_name Value
|
|
max_heap_table_size 16384
|
|
SELECT SUM(DISTINCT id) sm FROM t1;
|
|
sm
|
|
134225920
|
|
SELECT SUM(DISTINCT id) sm FROM t2;
|
|
sm
|
|
134225920
|
|
SELECT SUM(DISTINCT id) sm FROM t1 GROUP BY id % 13;
|
|
sm
|
|
10327590
|
|
10328851
|
|
10330112
|
|
10331373
|
|
10332634
|
|
10317510
|
|
10318770
|
|
10320030
|
|
10321290
|
|
10322550
|
|
10323810
|
|
10325070
|
|
10326330
|
|
#
|
|
# Bug mdev-4063: SUM(DISTINCT...) with small'max_heap_table_size
|
|
# (bug #56927)
|
|
#
|
|
SET max_heap_table_size=default;
|
|
INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_16385_to_32768 b;
|
|
TRUNCATE t2;
|
|
INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a,seq_1_to_32768 b
|
|
ORDER BY (a.seq*0+b.seq)*rand();
|
|
SELECT SUM(DISTINCT id) sm FROM t2;
|
|
sm
|
|
536887296
|
|
SET max_heap_table_size=16384;
|
|
SELECT SUM(DISTINCT id) sm FROM t2;
|
|
sm
|
|
536887296
|
|
DROP TABLE t1;
|
|
DROP TABLE t2;
|
|
SET @@tmp_table_size=@save_tmp_table_size;
|
|
SET @@max_heap_table_size=@save_max_heap_table_size;
|
|
#
|
|
# MDEV-4311: COUNT(DISTINCT...) requiring a file for UNIQUE (bug #68749)
|
|
#
|
|
CREATE TABLE t2 (id INTEGER) ENGINE=InnoDB;
|
|
BEGIN;
|
|
INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a, seq_1_to_16384 b
|
|
ORDER BY b.seq*rand();
|
|
INSERT INTO t2 VALUE(NULL);
|
|
# With default tmp_table_size / max_heap_table_size
|
|
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
|
|
sm
|
|
16384
|
|
set @@tmp_table_size=1024*256;
|
|
# With reduced tmp_table_size
|
|
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
|
|
sm
|
|
16384
|
|
set @@tmp_table_size=@save_tmp_table_size;
|
|
SET @@max_heap_table_size=1024*256;
|
|
# With reduced max_heap_table_size
|
|
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
|
|
sm
|
|
16384
|
|
SET @@max_heap_table_size=@save_max_heap_table_size;
|
|
# Back to default tmp_table_size / max_heap_table_size
|
|
SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2;
|
|
sm
|
|
16384
|
|
COMMIT;
|
|
DROP TABLE t2;
|