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Pushdown filter though UnionExec when some child support pushdown and some child do not support #20144
Description
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
Activity
haohuaijin commentedon Feb 4, 2026
take
feat: Pushdown filters through `UnionExec` nodes (#20145)
feat: Pushdown filters through `UnionExec` nodes (apache#20145)
feat: Pushdown filters through `UnionExec` nodes (apache#20145)