mingmwang commented on PR #5111:
URL:
https://github.com/apache/arrow-datafusion/pull/5111#issuecomment-1407939628
`Union` allows its inputs to have different schema names or even different
types. For example:
`select a1， b1 from tab_a1 UNION ALL select a2， b2 from tab_a2`
In case the `tab_a1` is sorted by (`'a1', 'b1')` and `tab_a2` is sorted by
`('a2', 'b2')`, we can safely derive the output ordering is (`'a1', 'b1')`. But
I think you can leave it for future since the current implementation is already
quite sophisticated.
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