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* Fixed bug #24420.unknown2007-01-261-0/+17
| | | | | | | | | | | | | Objects of the classes Item_func_is_not_null_test and Item_func_trig_cond must be transparent for the method Item::split_sum_func2 as these classes are pure helpers. It means that the method Item::split_sum_func2 should look at those objects as at pure wrappers. mysql-test/r/subselect3.result: Added a test case for bug #24420. mysql-test/t/subselect3.test: Added a test case for bug #24420.
* BUG#24127: merge fixes: If subselect is a union, dont allocate several unknown2007-01-241-1/+0
| | | | | | | | | | identical pushed_cond_guards arrays. Allocate only one always. mysql-test/r/subselect.result: BUG#24127: merge mysql-test/t/subselect3.test: BUG#24127: merge
* BUG#24127: (a,b) IN (SELECT c,d ...) can produce wrong results if a and/or b ↵unknown2007-01-121-10/+281
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | are NULLs: - Make the code produce correct result: use an array of triggers to turn on/off equalities for each compared column. Also turn on/off optimizations based on those equalities. - Make EXPLAIN output show "Full scan on NULL key" for tables for which we switch between ref/unique_subquery/index_subquery and ALL access. - index_subquery engine now has HAVING clause when it is needed, and it is displayed in EXPLAIN EXTENDED - Fix incorrect presense of "Using index" for index/unique-based subqueries (BUG#22930) // bk trigger note: this commit refers to BUG#24127 mysql-test/r/ndb_subquery.result: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Updated test results (checked) mysql-test/r/subselect.result: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Updated test results (checked) mysql-test/r/subselect2.result: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Updated test results (checked) mysql-test/r/subselect3.result: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Testcases mysql-test/t/subselect3.test: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Testcases sql/item_cmpfunc.cc: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - For row-based IN subqueries, use one flag per each column. Set the flags appropriately before running the subquery. sql/item_cmpfunc.h: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Added Item_func_trig_cond::get_triv_var() sql/item_subselect.cc: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Item_subselect::exec() and subselect_*_engine::exec() don't have parameter anymore - now Item_subselect owns the pushed down predicates guard flags. - A correct set of conditional predicates is now pushed into row-based IN subquery. - select_indexsubquery_engine now has "HAVING clause" (needed for correct query results), and it is shown in EXPLAIN EXTENDED sql/item_subselect.h: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Item_subselect::exec() and subselect_*_engine::exec() don't have parameter anymore - now Item_subselect owns the pushed down predicates guard flags. - A correct set of conditional predicates is now pushed into row-based IN subquery. - select_indexsubquery_engine now has "HAVING clause" (needed for correct query results), and it is shown in EXPLAIN EXTENDED sql/mysql_priv.h: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Added "in_having_cond" special Item name sql/mysqld.cc: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Added "in_having_cond" special Item name sql/sql_lex.h: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) sql/sql_select.cc: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Make "ref" analyzer be able to work with conditional equalities - Fix subquery optimization code to match the changes in what kinds of conditions are pushed down into subqueries - Fix wrong EXPLAIN output in some queries with subquery (BUG#22390) sql/sql_select.h: BUG#24127: wrong result for (null,not-null) IN (SELECT a,b ...) - Make "ref" analyzer be able to work with conditional equalities - Fix wrong EXPLAIN output in some queries with subquery (BUG#22390)
* BUG#24085: Wrong result for NULL IN (SELECT not_null_val FROM ...)unknown2007-01-121-2/+69
| | | | | | | | | | | | | | | | | | | | | | | | | | | When transforming "oe IN (SELECT ie ...)" wrap the pushed-down predicates iff "oe can be null", not "ie can be null". The fix doesn't cover row-based subqueries, those will be fixed in #24127. mysql-test/r/subselect.result: BUG#24085: Wrong result for NULL IN (SELECT not_null_val FROM ...) Update the test results (checked) mysql-test/r/subselect3.result: BUG#24085: Wrong result for NULL IN (SELECT not_null_val FROM ...) - Testcase mysql-test/t/subselect3.test: BUG#24085: Wrong result for NULL IN (SELECT not_null_val FROM ...) - Testcase sql/item_subselect.cc: BUG#24085: Wrong result for NULL IN (SELECT not_null_val FROM ...) When transforming "oe IN (SELECT ie ...)" we should make special provisions (wrap the pushed predicates) if we can encounter NULL IN (SELECT ...), i.e. when oe->maybe_null. The code was checking for ie->maybe_null instead, fixed it for single value based subqueries. Row-based subqueries (e.g. (a,b) IN (SELECT c,d ...)) are not fixed because they won't produce correct results for several other reasons (filed as #24085)
* BUG#8804: wrong results for NULL IN (SELECT ...)unknown2006-10-311-0/+137
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''
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