WinkerDu edited a comment on issue #1818:
URL: 
https://github.com/apache/arrow-datafusion/issues/1818#issuecomment-1081045098


   @xudong963 Sorry for late report to this issue since I'm quite busy last 
week.
   I have a raw fix #2108 :
   
   1. force all `Projection` under `Union` alias with column index like 
`column0`
   2. change field names match check to field type compatible check.


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