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3456d61ac0
This PR bundles 2 fixes:
1. Index search must skip NULL values
2. UPDATE must avoid using index which column is used in the SET clause
* This was an optimization to not do full scan in case of `UPDATE t
SET ... WHERE col = ?` but instead of doing this hacks we must properly
load updated row set to the ephemeral index and flush it after update
will be finished instead of modifying BTree inplace
* So, for now we completely remove this optimization and quitely
wait for proper optimization to land
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes #3459