MDEV-37029 Make vcol rewrite handle row-based INs #4131
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Queries having the form select * from t1 where (a+1, b) IN ((1,1),(2,2),(3,3)); where a+1 is a virtual column will now be optimized to use that virtual column such that the above becomes select * from t1 where (vcol, b) IN ((1,1),(2,2),(3,3)); In general, vcol substitution will occur when a row itself contains the matching vcol expression. The optimizer will not only inspect the left-hand argument to IN for the matching expression, but will also unpack and inspect the left-hand argument when it is a row.
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Queries having the form
where
a+1is a virtual column will now be optimized to use that virtual column such that the above becomesIn general, vcol substitution will occur when a row itself contains the matching vcol expression. The optimizer will not only inspect the left-hand argument to IN for the matching expression, but will also unpack and inspect the left-hand argument when it is a row.