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Bug#18411494 WRONG COMPARSION ON BIG DECIMAL VALUES
Problem: integer literals may be converted to floats for comparison with decimal data. If the integers are large, we may lose precision, and give wrong results. Fix: for <non-const decimal expression> <cmp> <const string expression> or <const string expression> <cmp> <non-const decimal expression> we override the compare_type chosen by item_cmp_type(), and do comparison as decimal rather than float. (cherry picked from commit mysql/mysql-server@1cf3489 and edited by Johannes Weißl <jargon@molb.org>)
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