db: fix overlap check for flushable ingest excises #3968
Merged
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Previously, we would incorrectly return false (denoting no overlap) between passed-in UserKeyBounds and a flushable ingest, if we see a file that starts after the passed-in bounds, even if there was an excise span overlapping with those bounds. This change fixes that, and adds a unit test to catch this edge case.
Fixes #3963.