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The SQL standard doesn't allow to use in HAVING clause fields that are not present in GROUP BY clause and not under any aggregate function in the HAVING clause. However, mysql allows using such fields. This extension assume that the non-grouping fields will have the same group-wise values. Otherwise, the result will be unpredictable. This extension allowed in strict MODE_ONLY_FULL_GROUP_BY sql mode results in misunderstanding of HAVING capabilities. The new error message ER_NON_GROUPING_FIELD_USED message is added. It says "non-grouping field '%-.64s' is used in %-.64s clause". This message is supposed to be used for reporting errors when some field is not found in the GROUP BY clause but have to be present there. Use cases for this message are this bug and when a field is present in a SELECT item list not under any aggregate function and there is GROUP BY clause present which doesn't mention that field. It renders the ER_WRONG_FIELD_WITH_GROUP error message obsolete as being more descriptive. The resolve_ref_in_select_and_group() function now reports the ER_NON_GROUPING_FIELD_FOUND error if the strict mode is set and the field for HAVING clause is found in the SELECT item list only. |
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