doki23 commented on PR #2177:
URL: 
https://github.com/apache/arrow-datafusion/pull/2177#issuecomment-1113175672

   > I don't think it should return multiply columns, structures are usually 
used for this.
   
   I cannot agree. Result of *Table Function* represents a temporary table. 
Since it's a table, it shouldn't only have one column.  Of course, one column 
of type structure can solve the problem, but it's different. We cannot directly 
use `order by` or other sql statements on it if we don't extract the structure.


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