[GitHub] ilooner opened a new pull request #1409: DRILL-6644: Don't reserve space for incoming probe batches unnecessarily during the build phase.

[GitBox <gi...@apache.org>]

ilooner opened a new pull request #1409: DRILL-6644: Don't reserve space for incoming probe batches unnecessarily during the build phase.
URL: https://github.com/apache/drill/pull/1409
 
 
   ## Problem
   
   Previously the memory calculator for HashJoin was reserving space for the worst case sized incoming probe batch. This is actually completely unnecessary since we won't read probe side data before the build phase anymore after DRILL-6453, so this effectively causes memory to be underutilized.
   
   ## Solution
   
   There are two cases we have to handle:
   
   - We received probe side data when fetching the schema. In this case we only have to account for the memory consumed by the probe data we received in the build phase. Not the worst case incoming probe batch size.
   - We received NO probe side data when fetching the schema for the probe side. In this case we don't have to reserve any memory for probe data during the build phase.
   
   ## Prerequisite
   
   The PR for DRILL-6453 must be merged first before this can go in. In this PR only look at the changes in the last commit.
   
   https://github.com/apache/drill/pull/1408
   

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