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Improve HashJoinExec metrics #4009

@Dandandan

Description

@Dandandan

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
The metrics don't fully tell the story of how hash joins spend their time.

Describe the solution you'd like
Suggestions:

  • Include a metric build_time that includes the time to build the hashmap (might be the most expensive part if build side is large)
  • Rename join_time to probe_time ?
  • Include the time for semi joins to update the visited bitmap and produce the final batches in probe_time

Describe alternatives you've considered

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