jonmmease commented on issue #3281:
URL:
https://github.com/apache/arrow-datafusion/issues/3281#issuecomment-1229192979
Here is the optimized logical plan for the example above:
```
Projection: #renamedA
Union
Projection: #tbl_1.renamedA
Projection: #tbl.colA AS renamedA, alias=tbl_1
Filter: #renamedA IS NOT NULL
TableScan: tbl projection=[colA]
Projection: #tbl_1.renamedA
Projection: #tbl.colA AS renamedA, alias=tbl_1
Filter: #renamedA IS NOT NULL
TableScan: tbl projection=[colA],
```
It looks like the filter is pushed down too far (below the projection that
creates the `renamedA` column).
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