julianhyde commented on issue #1469: [CALCITE-3367] Add AntiJoinRule to convert project-filter-join-aggreg… URL: https://github.com/apache/calcite/pull/1469#issuecomment-534833835 Semi-join may have a lower cost implementation than a regular Join. It’s worth knowing that you have one. Also, because it projects fewer columns, it may match materialized views that an equivalent ordinary join would not. Lastly, if your plan is using a semi-join operator you can safely weaken its input constraint from must-be-unique to should-be-unique.
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