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MDEV-7821 Server crashes in Item_func_group_concat::fix_fields on 2nd…
… execution of PS Correct fix for this bug. The problem was that Item_func_group_concat() was calling setup_order(), passing args as the second argument, ref_pointer_array. While ref_pointer_array should have free space at the end, as setup_order() can append elements to it. In this particular case args[] elements were overwritten when setup_order() was pushing new elements into ref_pointer_array.
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