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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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4
sql/sql_update.cc
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@ -290,6 +290,10 @@ int mysql_update(THD *thd,
DBUG_RETURN(1); /* purecov: inspected */
}
/* Apply the IN=>EXISTS transformation to all subqueries and optimize them. */
if (select_lex->optimize_unflattened_subqueries())
DBUG_RETURN(TRUE);
if (select_lex->inner_refs_list.elements &&
fix_inner_refs(thd, all_fields, select_lex, select_lex->ref_pointer_array))
DBUG_RETURN(1);