sql_select.cc:
Fixed bug #12885. Forced inheritence of the maybe_null flag for the expressions containing GROUP BY attributes in selects with ROLLUP. olap.test, olap.result: Added test case for bug #12885. mysql-test/r/olap.result: Added test case for bug #12885. mysql-test/t/olap.test: Added test case for bug #12885. sql/sql_select.cc: Fixed bug #12885. Forced inheritence of the maybe_null flag for the expressions containing GROUP BY attributes in selects with ROLLUP.
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