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  1. Apache Arrow
  2. ARROW-14182

[C++][Compute] Hash Join performance improvement

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      Add micro-benchmarks for hash join exec node.
      Write a new implementation of the interface HashJoinImpl making sure that it is efficient for all types of join. Current implementation, based on unordered map, trades performance for a simpler code and is likely not as fast as it could be.

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              michalno Michal Nowakiewicz
              michalno Michal Nowakiewicz
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