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Fix cases where SLEEP() calls would get optimized away or cached. (Bug #12689)

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mysql-test/r/func_misc.result:
  Add new results
mysql-test/t/func_misc.test:
  Add new regression test.
sql/item_create.cc:
  When SLEEP() is used, mark the statement as uncacheable.
sql/item_func.h:
  Flag SLEEP() as not constant, and set RAND_TABLE_BIT so that it is
  always evaluated.
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2005-08-19 15:51:40 -07:00
parent 0f556e8ff3
commit 05001e7504
4 changed files with 54 additions and 0 deletions
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mysql-test/r/func_misc.result
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@@ -70,3 +70,27 @@ select timediff(b, a) >= '00:00:03' from t1;
timediff(b, a) >= '00:00:03'
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drop table t1;
set global query_cache_size=1355776;
create table t1 (a int);
insert into t1 values (1),(1),(1);
create table t2 (a datetime default null, b datetime default null);
insert into t2 set a = now();
select a from t1 where sleep(1);
a
update t2 set b = now() where b is null;
insert into t2 set a = now();
select a from t1 where sleep(a);
a
update t2 set b = now() where b is null;
insert into t2 set a = now();
select a from t1 where sleep(1);
a
update t2 set b = now() where b is null;
select timediff(b, a) >= '00:00:03' from t2;
timediff(b, a) >= '00:00:03'
1
1
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drop table t2;
drop table t1;
set global query_cache_size=default;