Evaluate "NULL IN (SELECT ...)" in a special way: Disable pushed-down
conditions and their "consequences":
= Do full table scans instead of unique_[index_subquery] lookups.
= Change appropriate "ref_or_null" accesses to full table scans in
subquery's joins.
Also cache value of NULL IN (SELECT ...) if the SELECT is not correlated
wrt any upper select.
mysql-test/r/subselect.result:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Updated test results
sql/item.h:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Added comments
sql/item_cmpfunc.cc:
BUG#8804: wrong results for NULL IN (SELECT ...):
Made Item_in_optimizer to:
- cache the value of "NULL IN (uncorrelated select)"
- Turn off pushed-down predicates when evaluating "NULL IN (SELECT ...)"
sql/item_cmpfunc.h:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Made Item_in_optimizer cache the value of "NULL IN (uncorrelated select)"
- Added comments
sql/item_subselect.cc:
BUG#8804: wrong results for NULL IN (SELECT ...):
- When needed, wrap the predicates we push into subquery into an
Item_func_trig_cond so we're able to turn them off when evaluating
NULL IN (SELECT ...).
- Added code to evaluate NULL IN (SELECT ...) in a special way:
= In [unique_]index_subquery, do full table scan to see if there
are any rows.
= For other subqueries, change ref[_or_null] to ALL if the
ref[_or_null] was created from pushed-down predicate.
sql/item_subselect.h:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Added Item_subselect::is_correlated
- Added comments
sql/records.cc:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Make rr_sequential() non-static
sql/sql_lex.cc:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Added st_select_lex::is_correlated and Item_subselect::is_correlated.
sql/sql_lex.h:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Added st_select_lex::is_correlated
sql/sql_select.cc:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Added KEY_FIELD::outer_ref to keep track of which ref accesses are
created from predicates that were pushed down into the subquery.
sql/sql_select.h:
BUG#8804: wrong results for NULL IN (SELECT ...):
- Added KEYUSE::outer_ref
mysql-test/r/subselect3.result:
New BitKeeper file ``mysql-test/r/subselect3.result''
mysql-test/t/subselect3.test:
New BitKeeper file ``mysql-test/t/subselect3.test''
