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MySQL 5.7 has introduced permission limiting for the "SHOW VARIABLES" command; the MySQL dialect will now handle when SHOW returns no row, in particular for the initial fetch of SQL_MODE, and will emit a warning that user permissions should be modified to allow the row to be present. Change-Id: I98e7a69230da397b17eae07b7e9d024fa7aeeb26 Fixes: #4007