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| author | unknown <gkodinov/kgeorge@macbook.gmz> | 2006-10-31 11:01:27 +0200 |
|---|---|---|
| committer | unknown <gkodinov/kgeorge@macbook.gmz> | 2006-10-31 11:01:27 +0200 |
| commit | 634d3991ab818ea4afc8d98b40de75b22e0cae54 (patch) | |
| tree | dcbf2bbf181d7a3fb62c43e99e08fb7d44bfa6b0 /mysql-test/r | |
| parent | 5e1fe0f80043993c1db64169e4d87eb787762763 (diff) | |
| download | mariadb-git-634d3991ab818ea4afc8d98b40de75b22e0cae54.tar.gz | |
Bug #23184: SELECT causes server crash
Item::val_xxx() may be called by the server several times at execute time
for a single query. Calls to val_xxx() may be very expensive and sometimes
(count(distinct), sum(distinct), avg(distinct)) not possible.
To avoid that problem the results of calculation for these aggregate
functions are cached so that val_xxx() methods just return the calculated
value for the second and subsequent calls.
mysql-test/r/func_group.result:
Bug #23184: SELECT causes server crash
- test case
mysql-test/t/func_group.test:
Bug #23184: SELECT causes server crash
- test case
sql/item_sum.cc:
Bug #23184: SELECT causes server crash
- caching of the aggregate function results so no need to recalculate at val_xxx()
sql/item_sum.h:
Bug #23184: SELECT causes server crash
- caching of the aggregate function results so no need to recalculate at val_xxx()
Diffstat (limited to 'mysql-test/r')
| -rw-r--r-- | mysql-test/r/func_group.result | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/mysql-test/r/func_group.result b/mysql-test/r/func_group.result index c6117053a60..23517f7b603 100644 --- a/mysql-test/r/func_group.result +++ b/mysql-test/r/func_group.result @@ -1029,3 +1029,29 @@ t1 CREATE TABLE `t1` ( `stddev(0)` double(8,4) default NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; +CREATE TABLE t1 (a INT, b INT); +INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(1,7),(1,8); +INSERT INTO t1 SELECT a, b+8 FROM t1; +INSERT INTO t1 SELECT a, b+16 FROM t1; +INSERT INTO t1 SELECT a, b+32 FROM t1; +INSERT INTO t1 SELECT a, b+64 FROM t1; +INSERT INTO t1 SELECT a, b+128 FROM t1; +INSERT INTO t1 SELECT a, b+256 FROM t1; +INSERT INTO t1 SELECT a, b+512 FROM t1; +INSERT INTO t1 SELECT a, b+1024 FROM t1; +INSERT INTO t1 SELECT a, b+2048 FROM t1; +INSERT INTO t1 SELECT a, b+4096 FROM t1; +INSERT INTO t1 SELECT a, b+8192 FROM t1; +INSERT INTO t1 SELECT a, b+16384 FROM t1; +INSERT INTO t1 SELECT a, b+32768 FROM t1; +SELECT a,COUNT(DISTINCT b) AS cnt FROM t1 GROUP BY a HAVING cnt > 50; +a cnt +1 65536 +SELECT a,SUM(DISTINCT b) AS sumation FROM t1 GROUP BY a HAVING sumation > 50; +a sumation +1 2147516416 +SELECT a,AVG(DISTINCT b) AS average FROM t1 GROUP BY a HAVING average > 50; +a average +1 32768.5000 +DROP TABLE t1; +End of 5.0 tests |