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