[Backport] Add sqlReverseLookupThreshold for ReverseLookupRule. #15848
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If lots of keys map to the same value, reversing a LOOKUP call can slow things down unacceptably. To protect against this, this patch introduces a parameter sqlReverseLookupThreshold representing the maximum size of an IN filter that will be created as part of lookup reversal. If inSubQueryThreshold is set to a smaller value than sqlReverseLookupThreshold, then inSubQueryThreshold will be used instead. This allows users to use that single parameter to control IN sizes if they wish.
cryptoe
approved these changes
Feb 7, 2024
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Backport of #15832 to 29.0.0.