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Code Activity

Bug #29053 SQL_CACHE in UNION causes non-deterministic functions to be cached

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Changed code to enforce that SQL_CACHE only in the first SELECT is used to turn on caching(as documented), but any SQL_NO_CACHE will turn off caching (not documented, but a useful behaviour, especially for machine generated queries). Added test cases to explicitly test the documented caching behaviour and test cases for the reported bug.
This commit is contained in:
dkatz@damien-katzs-computer.local
2007-06-18 17:16:20 -04:00
parent c67c49fff0
commit b89e4f9ef2
3 changed files with 92 additions and 3 deletions
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53
mysql-test/r/query_cache.result
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@@ -179,12 +179,22 @@ a
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select * from t1 where a IN (select sql_cache a from t1);
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select * from t1 where a IN (select a from t1 union select sql_cache a from t1);
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show status like "Qcache_hits";
Variable_name Value
Qcache_hits 4
show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 2
Qcache_queries_in_cache 1
set query_cache_type=on;
reset query cache;
show status like "Qcache_queries_in_cache";
@@ -195,6 +205,41 @@ a
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select * from t1 union select sql_no_cache * from t1;
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select * from t1 where a IN (select sql_no_cache a from t1);
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select * from t1 where a IN (select a from t1 union select sql_no_cache a from t1);
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select sql_cache sql_no_cache * from t1;
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select sql_cache * from t1 union select sql_no_cache * from t1;
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select sql_cache * from t1 where a IN (select sql_no_cache a from t1);
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select sql_cache * from t1 where a IN (select a from t1 union select sql_no_cache a from t1);
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show status like "Qcache_queries_in_cache";
Variable_name Value
Qcache_queries_in_cache 0
@@ -1416,3 +1461,9 @@ insert into t1 values ('c');
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drop table t1;
set GLOBAL query_cache_size= default;
set GLOBAL query_cache_size=1000000;
create table t1 (a char);
insert into t1 values ('c');
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drop table t1;
set GLOBAL query_cache_size= default;