[GitHub] [pinot] walterddr commented on pull request #10488: [multistage] Adding Stage node support for CorrelateNode and UncollectNode

["walterddr (via GitHub)" <gi...@apache.org>]

walterddr commented on PR #10488:
URL: https://github.com/apache/pinot/pull/10488#issuecomment-1488757582

   > @xiangfu0 Would `CROSS JOIN UNNEST` between correlated LHS and RHS (UNNEST basically operates on a field that belongs to left join relation) results only in the cross product of the current row of the left table with all the rows from the UNNEST output?
   
   that's the definition when doing 
   ```
   ... FROM tbl CROSS JOIN UNNEST(tbl.arrCol)
   ```
   see LATERAL & UNNEST in https://www.postgresql.org/docs/current/queries-table-expressions.html


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