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Michael Widenius authored
Fixed MDEV-4002: Server crash or valgrind errors in Item_func_group_concat::setup and Item_func_group_concat::add mysql-test/r/group_by.result: Added test case for failing GROUP_CONCAT ... ROLLUP queries mysql-test/t/group_by.test: Added test case for failing GROUP_CONCAT ... ROLLUP queries sql/item_sum.cc: Fixed issue where field->table pointed to different temporary table than expected. Ensure that order->next points to the right object (could cause problems with setup_order())
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