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Fixes #38704. This change adds a PruneSemiAntiJoinRightCols to prune columns in the RHS of a semi/anti join. Alternatively, we could just tag the PruneJoinRightCols rule as higher priority to achieve the same effect (previously that rule was never triggered because the `EliminateProjects` rule would fire and remove the projections after `PruneJoinLeftCols` rule is applied). I prefer this rule because it avoids requiring an ordering of transformations. Release note: None
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Ridwan Sharif
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Aug 15, 2019
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