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View File Name : count_distinct3.test

# The include statement below is a temp one for tests that are yet to
#be ported to run with InnoDB,
#but needs to be kept for tests that would need MyISAM in future.
--source include/force_myisam_default.inc

# Bug #958 a big table without indices and select with group by doesnt work
# this is a test for error 1032 in count(distinct) + group by, introduced in 
# mysql-4.1
#

--source include/big_test.inc

--disable_warnings
DROP TABLE IF EXISTS t1, t2;
--enable_warnings

CREATE TABLE t1 (id INTEGER, grp TINYINT, id_rev INTEGER);

--disable_query_log
SET @rnd_max= 2147483647;
let $1 = 1000;
while ($1)
{
  SET @rnd= RAND();
  SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
  SET @id_rev= @rnd_max - @id;
  SET @grp= CAST(127.0 * @rnd AS UNSIGNED); 
  INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev); 
  dec $1;
}

# We increase the size of t1 here.
SET @orig_myisam_sort_buffer_size = @@session.myisam_sort_buffer_size;
SET session myisam_sort_buffer_size=20000000;
INSERT INTO t1
SELECT A.id, A.grp, A.id_rev
FROM 
  t1 A,
  (SELECT * FROM t1 B LIMIT 100) B,
  (SELECT * FROM t1 Z LIMIT 42) Z;
--enable_query_log

SELECT COUNT(*) FROM t1;

# As t1 contains random numbers, results are different from test to test. 
# That's okay, because we test only that select doesn't yield an
# error. Note, that --disable_result_log doesn't suppress error output.
--disable_result_log
SELECT COUNT(DISTINCT id) FROM t1 GROUP BY grp;
--enable_result_log

--echo # Begin cleanup
SET session myisam_sort_buffer_size = @orig_myisam_sort_buffer_size;
DROP TABLE t1;

# End of 4.1 tests