Allow hash functions to work on BINARY columns when the binary is not valid UTF8 #3161
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Previous, as part of computing hashes for MySQL's hash functions (MD5, SHA1, etc), we could convert the input into a text type. But this would cause errors in strict mode of the input was a binary value that was not valid utf8.
By converting the input into a binary type, we keep all the same behavior, except that binary inputs now work correctly.