korowa opened a new pull request #1781:
URL: https://github.com/apache/arrow-datafusion/pull/1781
# Which issue does this PR close?
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Closes #1509.
# Rationale for this change
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# What changes are included in this PR?
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Currently pushing predicates to union all inputs generates following plan:
```
Projection: #x.a
Union
Projection: #baz.a
Filter: #x.a = Int64(1)
TableScan: baz projection=Some([0])
Projection: #bar.a
Filter: #x.a = Int64(1)
TableScan: bar projection=Some([0])
```
which breaks on trying to filter bar/baz tables on x.a field.
Changes included in this PR remove qualifiers from predicates before pushing
them down to union inputs and modifiy projection plan step to make it able to
resolve unqualified column identifiers in filters (this could happen due to
predicate being rewritten in union step).
# Are there any user-facing changes?
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Fixed execution of queries with filters on CTE/subqueries containing UNION
clause
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