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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/10/18 03:01:53 UTC

[GitHub] [arrow-datafusion] mingmwang commented on issue #3864: Replace `Filter: Boolean(false)` with `EmptyRelation`

mingmwang commented on issue #3864:
URL: https://github.com/apache/arrow-datafusion/issues/3864#issuecomment-1281750736

   We can have two general rules: `FoldFilters` and `EmptyRelationPropagation`.
   `FoldFilters` can remove the filters which can be evaluated trivially. If `Filter` condition is alway false,  replace it with an `EmptyRelation`
   
   `EmptyRelationPropagation` can propagate the empty relation up to the tree, for example, inner join with `EmptyRelation` can return `EmptyRelation`.
   
   
   
   
   


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