samueldlightfoot opened a new pull request, #4608:
URL: https://github.com/apache/cassandra/pull/4608

   Test: 
CompactionDeleteRowRangeTest::test2DeleteRangeWithOverlapingBoundAndSameTimestampCompaction
   
   _The two deletes use the same CQL timestamp, so compaction should merge 
their overlapping range tombstones into a single open/close pair (no boundary 
markers). However, DeletionTime also includes local_delete_time (wall-clock 
seconds), which may differ between deletes if a second boundary is crossed 
during the flush. Differing local_delete_time causes the merger to treat them 
as distinct deletions, producing boundary markers instead. Using 
executeInternalWithNowInSec with a fixed nowInSec ensures both deletes get 
identical DeletionTime values._
   
   patch by Sam Lightfoot; reviewed by <Reviewers> for CASSANDRA-21163


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