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MWL#89: Cost-based choice between Materialization and IN->EXISTS transformation

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Fixes for multiple problems/bugs/test failures that resulted from moving
subquery optimization from the execution phase to the optimization phase.
This commit is contained in:
unknown 2010-09-05 18:43:47 +03:00
commit 18ad3bdc2f
14 changed files with 528 additions and 269 deletions
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2
sql/item_cmpfunc.h
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@ -265,6 +265,8 @@ public:
void keep_top_level_cache();
Item *transform(Item_transformer transformer, uchar *arg);
virtual Item *expr_cache_insert_transformer(uchar *thd_arg);
bool is_expensive_processor(uchar *arg);
bool is_expensive();
};
class Comp_creator