adriangb commented on code in PR #17238:
URL: https://github.com/apache/datafusion/pull/17238#discussion_r2286017094
##########
datafusion/physical-plan/src/projection.rs:
##########
@@ -273,6 +278,24 @@ impl ExecutionPlan for ProjectionExec {
Ok(Some(Arc::new(projection.clone())))
}
}
+
+ fn gather_filters_for_pushdown(
+ &self,
+ _phase: FilterPushdownPhase,
+ parent_filters: Vec<Arc<dyn PhysicalExpr>>,
+ _config: &ConfigOptions,
+ ) -> Result<FilterDescription> {
+ FilterDescription::from_children(parent_filters, &self.children())
Review Comment:
While this will work it does not deal with aliases. There's a world of
arbitrary complexity where we essentially apply inverse projections to filters
so we can push them down, but that seems very hard. Alisases though should be
easy and we can deal with them here. It would essentially involve transforming
the expressions before calling `from_children` to invert any aliases. Could you
file an issue for this bit and leave a comment saying this only handles
unprojected columns for now?
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