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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2019/12/04 09:50:37 UTC

[GitHub] [calcite] rubenada opened a new pull request #1614: [CALCITE-3546] Improve EnumerableDefaults nested loop join

rubenada opened a new pull request #1614: [CALCITE-3546] Improve EnumerableDefaults nested loop join
URL: https://github.com/apache/calcite/pull/1614
 
 
   Jira ticket: [CALCITE-3546](https://issues.apache.org/jira/browse/CALCITE-3546)
   
   The current implementation of `EnumerableDefaults#nestedLoopJoin` builds the complete join result in a list before returning it. As specified in a comment there, this is "easy, but hogs memory". Also, it is not very efficient if after the join there is a LIMIT.
   An alternative implementation of nested loop join can be proposed, based on iterating through the outer an inner enumerables, and returning the results step by step (something similar to `EnumerableDefaults#correlateJoin`).

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