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6a2ef5577c
Item_sum_count_distinct, and deploy Unique for use with COUNT(DISTINCT) if there is no blob column in the list of DISTINCT arguments.
155 lines
4.6 KiB
Plaintext
155 lines
4.6 KiB
Plaintext
#
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# Various tests for SUM(DISTINCT ...)
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#
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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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CREATE TABLE t1 (
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id INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
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gender CHAR(1),
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name VARCHAR(20)
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);
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# According to ANSI SQL, SUM(DISTINCT ...) should return NULL for empty
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# record set
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SELECT SUM(DISTINCT LENGTH(name)) s1 FROM t1;
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# According to ANSI SQL, SUM(DISTINCT ...) should return NULL for records sets
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# entirely consisting of NULLs
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INSERT INTO t1 (gender, name) VALUES (NULL, NULL);
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INSERT INTO t1 (gender, name) VALUES (NULL, NULL);
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INSERT INTO t1 (gender, name) VALUES (NULL, NULL);
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SELECT SUM(DISTINCT LENGTH(name)) s1 FROM t1;
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# Filling table with t1
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INSERT INTO t1 (gender, name) VALUES ('F', 'Helen'), ('F', 'Anastasia'),
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('F', 'Katherine'), ('F', 'Margo'), ('F', 'Magdalene'), ('F', 'Mary');
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CREATE TABLE t2 SELECT name FROM t1;
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SELECT (SELECT SUM(DISTINCT LENGTH(name)) FROM t1) FROM t2;
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DROP TABLE t2;
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INSERT INTO t1 (gender, name) VALUES ('F', 'Eva'), ('F', 'Sofia'),
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('F', 'Sara'), ('F', 'Golda'), ('F', 'Toba'), ('F', 'Victory'),
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('F', 'Faina'), ('F', 'Miriam'), ('F', 'Beki'), ('F', 'America'),
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('F', 'Susan'), ('F', 'Glory'), ('F', 'Priscilla'), ('F', 'Rosmary'),
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('F', 'Rose'), ('F', 'Margareth'), ('F', 'Elizabeth'), ('F', 'Meredith'),
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('F', 'Julie'), ('F', 'Xenia'), ('F', 'Zena'), ('F', 'Olga'),
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('F', 'Brunhilda'), ('F', 'Nataly'), ('F', 'Lara'), ('F', 'Svetlana'),
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('F', 'Grethem'), ('F', 'Irene');
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SELECT
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SUM(DISTINCT LENGTH(name)) s1,
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SUM(DISTINCT SUBSTRING(NAME, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(name, 1, 4))) s3
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FROM t1;
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SELECT
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SUM(DISTINCT LENGTH(g1.name)) s1,
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SUM(DISTINCT SUBSTRING(g2.name, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(g3.name, 1, 4))) s3
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FROM t1 g1, t1 g2, t1 g3;
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SELECT
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SUM(DISTINCT LENGTH(g1.name)) s1,
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SUM(DISTINCT SUBSTRING(g2.name, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(g3.name, 1, 4))) s3
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FROM t1 g1, t1 g2, t1 g3 GROUP BY LENGTH(SUBSTRING(g3.name, 5, 10));
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# here we explicitly request summing through temporary table (so
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# Item_sum_sum_distinct::copy_or_same() is called)
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SELECT SQL_BUFFER_RESULT
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SUM(DISTINCT LENGTH(name)) s1,
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SUM(DISTINCT SUBSTRING(NAME, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(name, 1, 4))) s3
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FROM t1;
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SELECT SQL_BUFFER_RESULT
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SUM(DISTINCT LENGTH(g1.name)) s1,
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SUM(DISTINCT SUBSTRING(g2.name, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(g3.name, 1, 4))) s3
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FROM t1 g1, t1 g2, t1 g3 GROUP BY LENGTH(SUBSTRING(g3.name, 5, 10));
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# this test demonstrates that strings are automatically converted to numbers
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# before summing
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SET @l=1;
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UPDATE t1 SET name=CONCAT(name, @l:=@l+1);
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SELECT SUM(DISTINCT RIGHT(name, 1)) FROM t1;
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# this is a test case for ordinary t1
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SELECT SUM(DISTINCT id) FROM t1;
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SELECT SUM(DISTINCT id % 11) FROM t1;
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DROP TABLE t1;
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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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DROP TABLE t1;
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DROP TABLE t2;
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