2 ms·
It's still (5.7) really bad sometimes. A simple `IN (subquery)` can sometimes run much better if the subquery is fetched and another round-trip query is made us
by karmakaze 4y ago
It's still (5.7) really bad sometimes. A simple `IN (subquery)` can sometimes run much better if the subquery is fetched and another round-trip query is made using literal values for the `IN (...)`. I'm sure there are plenty of other 'deoptimizing' query patterns that shouldn't be.