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7973d43ba4
DESCRIPTION: Ignore pruned target list entries in coordinator plan
The postgres planner has the ability to prune target list entries that are proven not used in the output relation. When this happens at the `CitusCustomScan` boundary we need to _not_ return these pruned columns to not upset the rest of the planner.
By using the target list the planner asks us to return we fix issues that lead to Assertion failures, and potentially could be runtime errors when they hit in a production build.
Fixes #3809
(cherry picked from commit
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