Commits on May 30, 2022

1. opt: fix bug with incorrect results produced by paired left lookup join …

   Prior to this patch, it was possible for a paired join to produce incorrect
   results for a left lookup join. In particular, some output rows had
   non-NULL values for right-side columns when the right-side columns should
   have been NULL.
   
   This commit fixes the issue by updating the optimizer to ensure that
   only columns from the second join in the paired join (the index join)
   are projected, not columns from the first (the lookup join).
   
   Fixes cockroachdb#81968
   
   Release note (bug fix): Fixed an issue where a left lookup join could
   have incorrect results. In particular, some output rows could have non-NULL
   values for right-side columns when the right-side columns should
   have been NULL. This issue only exists in 22.1.0 and prior development
   releases of 22.1.

   

   rytaft committed May 30, 2022
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