Fixed bug #28337: wrong results for grouping queries with correlated
subqueries in WHERE conditions. This bug was introduced by the patch for bug 27321. mysql-test/r/subselect.result: Added a test case for bug #28337. mysql-test/t/subselect.test: Added a test case for bug #28337. sql/item.cc: Fixed bug #28337: wrong results for grouping queries with correlated subqueries in WHERE conditions. This bug was introduced by the patch for bug 27321. Now in the Item_field::fix_outer_field function we create an Item_outer_ref object for an outer reference only if it is used in the SELECT list or in the HAVING clause of the subquery against which the reference is resolved.
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