bzr commit into mysql-5.0-bugteam branch (patrick.crews:2748) Bug#26887

[Patrick Crews]

#At file:///Users/pcrews/usr/local/bin/data1/work/count/mysql-5.0-bugteam/ based on revid:satya.bn@stripped

 2748 Patrick Crews	2009-04-09
      Bug#26887: main.count_distinct3 fails randomly
      
      Revised the method of inflating the size of t1 in the test to use OUTFILE / INFILE to speed up the process.
      My experiments showed an average improvement of 14 seconds off the runtime of the test.
      
      Re-recorded the .result file to account for the changes to the test.

    modified:
      mysql-test/r/count_distinct3.result
      mysql-test/t/count_distinct3.test
=== modified file 'mysql-test/r/count_distinct3.result'
--- a/mysql-test/r/count_distinct3.result	2003-11-20 23:53:01 +0000
+++ b/mysql-test/r/count_distinct3.result	2009-04-10 00:23:55 +0000
@@ -2,7 +2,6 @@ DROP TABLE IF EXISTS t1, t2;
 CREATE TABLE t1 (id INTEGER, grp TINYINT, id_rev INTEGER);
 SELECT COUNT(*) FROM t1;
 COUNT(*)
-4181000
+4201000
 SELECT COUNT(DISTINCT id) FROM t1 GROUP BY grp;
 DROP TABLE t1;
-set @@read_buffer_size=default;

=== modified file 'mysql-test/t/count_distinct3.test'
--- a/mysql-test/t/count_distinct3.test	2006-10-03 07:03:35 +0000
+++ b/mysql-test/t/count_distinct3.test	2009-04-10 00:23:55 +0000
@@ -1,4 +1,4 @@
-#
+# 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
 #
@@ -21,27 +21,20 @@ while ($1)
   INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev); 
   dec $1;
 }
-set @@read_buffer_size=2*1024*1024;
-CREATE TABLE t2 SELECT * FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
-INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
-DROP TABLE t2;
+
+# Here we dump the contents of t1 to an OUTFILE and use
+# LOAD DATA INFILE to make t1 VERY large ( > 4 million rows)
+--disable_query_log
+let $help_file = $MYSQLTEST_VARDIR/tmp/count_distinct3.dat;
+eval SELECT * INTO OUTFILE '$help_file'
+LINES TERMINATED BY '\n' FROM t1;
+let $counter = 4200;
+while ($counter)
+{
+  eval LOAD DATA INFILE '$help_file' INTO TABLE t1;
+  dec $counter;
+}
+--remove_file $help_file
 --enable_query_log
 
 SELECT COUNT(*) FROM t1;
@@ -55,6 +48,4 @@ SELECT COUNT(DISTINCT id) FROM t1 GROUP 
 --enable_result_log
 DROP TABLE t1;
 
-set @@read_buffer_size=default;
-
 # End of 4.1 tests


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