Commits on Oct 5, 2024

1. Simplify planning of MERGE …

   Currently, the planner inserts a projection of the following shape
   to assemble the merged row:
   
       merge_row := (
           CASE
               WHEN ... THEN
                   ROW(..., $not((present IS NULL)), <operation>, 0)
               WHEN ... THEN
                   ROW(..., $not((present IS NULL)), <operation>, 1)
               ...
               ELSE
                   ROW(<nulls>, $not((present IS NULL)), -1, -1)
           END)
   
   This change replaces the ELSE branch to return a single null instead of a synthetic
   value with nulls. By reducing the size of the projection, it allows for wider
   tables to be used with MERGE.

   

   martint committed Oct 5, 2024
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