michalursa opened a new pull request #11350:
URL: https://github.com/apache/arrow/pull/11350


   Fixing 3 issues:
   - one in SchemaProjectionMaps - I simplified all of the code to get rid of 
thread synchronization at all
   - one in TaskScheduler - added (unnecessary) mutex
   - one in HashJoinImpl - switching from shared byte vector to local bit 
vectors and merge (for recording if a match for a hash table row has been seen)


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