netudima opened a new pull request, #4797:
URL: https://github.com/apache/cassandra/pull/4797

   org.apache.cassandra.db.rows.RangeTombstoneMarker.Merger is allocated on 
demand Optional usage in 
org.apache.cassandra.db.rows.UnfilteredRowIteratorWithLowerBound is replaced 
with a boolean field Double in 
org.apache.cassandra.io.util.CompressedChunkReader#getCrcCheckChance - 
specialized supplier is used to avoid boxing Stack - adjust default from 5 to 6 
to avoid extra resizings in org.apache.cassandra.db.transform.Stack#resize 
EnumSet for CL guardrail in SelectStatement - add a condition to allocate it 
only if the guardrail is enabled EnumSet in ResultMetadata - replace it with 
plain int flags
   
   patch by Dmitry Konstantinov; reviewed by TBD for CASSANDRA-21360
   


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