haohuaijin commented on code in PR #21460:
URL: https://github.com/apache/datafusion/pull/21460#discussion_r3052205798
##########
datafusion/physical-plan/src/filter.rs:
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@@ -2572,4 +2576,67 @@ mod tests {
);
Ok(())
}
+
+ /// Regression test: ProjectionExec on top of a FilterExec that already has
Review Comment:
for our use case, we first use sql to generate the physical plan, then apply
some plan rewrite, then apply some physical optimizer rule.
for this bug, after generate physical plan, we remove the FilterExec, but
the FilterExec have the projection, so it leaves a ProjectionExec, then in the
datasourceExec, we add a FilterExec in top of it. so the final plan is look like
```
ProjectionExec
FilterExec
DataSourceExec
```
for abvoe plan, we run the `ProjectionPushdown` that find this bug.
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