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1b426d3c6d
Problem: GROUP BY on empty ucs2 strings crashed server. Reason: sometimes mi_unique_hash() is executed with ptr=null and length=0, which means "empty string". The branch of code handling UCS2 character set was not safe against ptr=null and fell into and endless loop even if length=0 because of poiter arithmetic overflow. Fix: adding special check for length=0 to avoid pointer arithmetic overflow.
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