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release-2.1: distsqlplan: fix error in union planning #34913
Backport 1/1 commits from #34762.
Previously, if 2 inputs to a UNION ALL had identical post processing
Release note (bug fix): fix a planning crash during UNION ALL operations
Previously, if 2 inputs to a UNION ALL had identical post processing except for renders, further post processing on top of that union all could invalidate the plan and cause errors or crashes. Release note (bug fix): fix a planning crash during UNION ALL operations that had projections, filters or renders directly on top of the UNION ALL in some cases.