mihaibudiu opened a new pull request, #5149:
URL: https://github.com/apache/calcite/pull/5149

   ## Jira Link
   
   [CALCITE-7670](https://issues.apache.org/jira/browse/CALCITE-7670)
   
   ## Changes Proposed
   
   The Unnest operator gains a new flag "isOuter" which indicates that it is 
used on the RHS of a LEFT JOIN.
   This enables plans which used Correlate(left=true) + Unnest to be rewritten 
as Correlate(left=false) + Unnest(left=true).
   Some of these plans can then be completely decorrelated, which wasn't 
possible previously.


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