omegablitz commented on issue #1064:
URL:
https://github.com/apache/arrow-datafusion/issues/1064#issuecomment-931949821
This issue is actually reproducible with the following (simpler) query:
```
SELECT SUM(d)
FROM (
SELECT c, c AS d FROM table_1
UNION ALL
SELECT c, c AS d FROM table_1
)
```
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