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This bug could result in returning 0 for the expressions of the form <aggregate_function>(distinct field) when the system variable max_heap_table_size was set to a small enough number. It happened because the method Unique::walk() did not support the case when more than one pass was needed to merge the trees of distinct values saved in an external file. Backported a fix in grant_lowercase.test from mariadb 5.5.
84 lines
2.4 KiB
Text
84 lines
2.4 KiB
Text
#
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# Various tests for SUM(DISTINCT ...)
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#
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--source include/big_test.inc
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--disable_warnings
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DROP TABLE IF EXISTS t1, t2;
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--enable_warnings
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#
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# Test the case when distinct values doesn't fit in memory and
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# filesort is used (see uniques.cc:merge_walk)
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#
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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 (id) VALUES (1), (1), (1),(1);
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INSERT INTO t1 (id) SELECT id FROM t1; /* 8 */
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INSERT INTO t1 (id) SELECT id FROM t1; /* 12 */
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INSERT INTO t1 (id) SELECT id FROM t1; /* 16 */
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INSERT INTO t1 (id) SELECT id FROM t1; /* 20 */
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INSERT INTO t1 (id) SELECT id FROM t1; /* 24 */
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INSERT INTO t1 SELECT id+1 FROM t1;
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INSERT INTO t1 SELECT id+2 FROM t1;
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INSERT INTO t1 SELECT id+4 FROM t1;
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INSERT INTO t1 SELECT id+8 FROM t1;
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INSERT INTO t1 SELECT id+16 FROM t1;
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INSERT INTO t1 SELECT id+32 FROM t1;
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INSERT INTO t1 SELECT id+64 FROM t1;
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INSERT INTO t1 SELECT id+128 FROM t1;
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INSERT INTO t1 SELECT id+256 FROM t1;
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INSERT INTO t1 SELECT id+512 FROM t1;
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# Just test that AVG(DISTINCT) is there
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SELECT AVG(DISTINCT id) FROM t1 GROUP BY id % 13;
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SELECT SUM(DISTINCT id)/COUNT(DISTINCT id) FROM t1 GROUP BY id % 13;
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INSERT INTO t1 SELECT id+1024 FROM t1;
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INSERT INTO t1 SELECT id+2048 FROM t1;
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INSERT INTO t1 SELECT id+4096 FROM t1;
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INSERT INTO t1 SELECT id+8192 FROM t1;
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INSERT INTO t2 SELECT id FROM t1 ORDER BY id*rand();
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# SELECT '++++++++++++++++++++++++++++++++++++++++++++++++++';
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SELECT SUM(DISTINCT id) sm FROM t1;
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SELECT SUM(DISTINCT id) sm FROM t2;
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SELECT SUM(DISTINCT id) sm FROM t1 group by id % 13;
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# this limit for max_heap_table_size is set to force testing the case, when
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# all distinct sum values can not fit in memory and must be stored in a
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# temporary table
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SET max_heap_table_size=16384;
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# to check that max_heap_table_size was actually set (hard limit for minimum
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# max_heap_table_size is set in mysqld.cc):
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SHOW variables LIKE 'max_heap_table_size';
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SELECT SUM(DISTINCT id) sm FROM t1;
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SELECT SUM(DISTINCT id) sm FROM t2;
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SELECT SUM(DISTINCT id) sm FROM t1 GROUP BY id % 13;
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--echo #
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--echo # Bug mdev-4063: SUM(DISTINCT...) with small'max_heap_table_size
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--echo # (bug #56927)
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--echo #
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SET max_heap_table_size=default;
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INSERT INTO t1 SELECT id+16384 FROM t1;
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DELETE FROM t2;
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INSERT INTO t2 SELECT id FROM t1 ORDER BY id*rand();
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SELECT SUM(DISTINCT id) sm FROM t2;
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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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DROP TABLE t1;
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DROP TABLE t2;
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