Commits on Feb 2, 2022

1. opt,sql: use paired-joins with non-covering indexes for left joins …

   This is done when the left outer/semi/anti join can use a
   lookup join. Prior to this, when the non-covering index
   could not fully evaluate the filter for left join we could
   not generate a lookup join.
   
   With this change:
   - Left outer join becomes a pair of two left outer joins.
   - Left semi join is a pair of inner join followed by left
     semi join.
   - Left anti join is a pair of left outer join followed by
     left anti join.
   
   Informs cockroachdb#55452
   
   Release note (performance improvement): The optimizer can now
   generate lookup joins in certain cases for non-covering
   indexes, when performing a left outer/semi/anti join.

   

   sumeerbhola authored and rytaft committed Feb 2, 2022
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