haohuaijin opened a new issue, #20144:
URL: https://github.com/apache/datafusion/issues/20144
### Is your feature request related to a problem or challenge?
for pushdown filter though `UnionExec`, i find only all child in UnionExec
support filter pushdown, the filter will pushdown, otherwise it will not
pushdown. But for below case, pushdown filter is benefit
```
FilterExec: a@0 = foo
UnionExec
DataSourceExec: file_groups={1 group:
[[test.parquet]]},pushdown_supported=true
DataSourceExec: file_groups={1 group:
[[test.parquet]]},pushdown_supported=false
```
### Describe the solution you'd like
support pushdown filter though UnionExec, also even though all child do not
support pushdown filter, we also can pushdown filter under the UnionExec. for
example
```
FilterExec: a@0 = foo
UnionExec
DataSourceExec: file_groups={1 group: [[test.parquet]]},
pushdown_supported=false
DataSourceExec: file_groups={1 group: [[test.parquet]]},
pushdown_supported=false
```
after filter pushdown
```
UnionExec
FilterExec: a@0 = foo
DataSourceExec: file_groups={1 group: [[test.parquet]]},
pushdown_supported=false
FilterExec: a@0 = foo
DataSourceExec: file_groups={1 group: [[test.parquet]]},
pushdown_supported=false
```
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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