1# 2# Various tests for SUM(DISTINCT ...) 3# 4 5--source include/big_test.inc 6--source include/have_innodb.inc 7--source include/have_sequence.inc 8 9set @save_tmp_table_size=@@tmp_table_size; 10set @save_max_heap_table_size=@@max_heap_table_size; 11 12# 13# Test the case when distinct values doesn't fit in memory and 14# filesort is used (see uniques.cc:merge_walk) 15# 16 17set storage_engine=MYISAM; 18 19CREATE TABLE t1 (id INTEGER); 20CREATE TABLE t2 (id INTEGER); 21 22INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_1_to_1024 b; 23 24# Just test that AVG(DISTINCT) is there 25SELECT AVG(DISTINCT id) FROM t1 GROUP BY id % 13; 26SELECT SUM(DISTINCT id)/COUNT(DISTINCT id) FROM t1 GROUP BY id % 13; 27 28INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_1025_to_16384 b; 29INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a,seq_1_to_16384 b 30ORDER by (a.seq*0+b.seq)*rand(); 31 32# SELECT '++++++++++++++++++++++++++++++++++++++++++++++++++'; 33 34SELECT SUM(DISTINCT id) sm FROM t1; 35SELECT SUM(DISTINCT id) sm FROM t2; 36SELECT SUM(DISTINCT id) sm FROM t1 group by id % 13; 37 38# this limit for max_heap_table_size is set to force testing the case, when 39# all distinct sum values can not fit in memory and must be stored in a 40# temporary table 41 42SET max_heap_table_size=16384; 43 44# to check that max_heap_table_size was actually set (hard limit for minimum 45# max_heap_table_size is set in mysqld.cc): 46 47SHOW variables LIKE 'max_heap_table_size'; 48 49SELECT SUM(DISTINCT id) sm FROM t1; 50SELECT SUM(DISTINCT id) sm FROM t2; 51SELECT SUM(DISTINCT id) sm FROM t1 GROUP BY id % 13; 52 53--echo # 54--echo # Bug mdev-4063: SUM(DISTINCT...) with small'max_heap_table_size 55--echo # (bug #56927) 56--echo # 57 58SET max_heap_table_size=default; 59 60INSERT INTO t1 SELECT b.seq FROM seq_1_to_128,seq_16385_to_32768 b; 61TRUNCATE t2; 62INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a,seq_1_to_32768 b 63ORDER BY (a.seq*0+b.seq)*rand(); 64 65SELECT SUM(DISTINCT id) sm FROM t2; 66 67SET max_heap_table_size=16384; 68 69SELECT SUM(DISTINCT id) sm FROM t2; 70 71DROP TABLE t1; 72DROP TABLE t2; 73 74SET @@tmp_table_size=@save_tmp_table_size; 75SET @@max_heap_table_size=@save_max_heap_table_size; 76 77--echo # 78--echo # MDEV-4311: COUNT(DISTINCT...) requiring a file for UNIQUE (bug #68749) 79--echo # 80CREATE TABLE t2 (id INTEGER) ENGINE=InnoDB; 81 82BEGIN; 83INSERT INTO t2 SELECT b.seq FROM seq_1_to_128 a, seq_1_to_16384 b 84ORDER BY b.seq*rand(); 85INSERT INTO t2 VALUE(NULL); 86 87--echo # With default tmp_table_size / max_heap_table_size 88SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2; 89 90set @@tmp_table_size=1024*256; 91 92--echo # With reduced tmp_table_size 93SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2; 94 95set @@tmp_table_size=@save_tmp_table_size; 96SET @@max_heap_table_size=1024*256; 97 98--echo # With reduced max_heap_table_size 99SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2; 100 101SET @@max_heap_table_size=@save_max_heap_table_size; 102 103--echo # Back to default tmp_table_size / max_heap_table_size 104SELECT SQL_NO_CACHE count(DISTINCT id) sm FROM t2; 105COMMIT; 106 107DROP TABLE t2; 108