gengliangwang commented on pull request #31859:
URL: https://github.com/apache/spark/pull/31859#issuecomment-801955243


   > Shall we simply fail if there are multiple matches in the type collection? 
It's a bit tricky to define "closest"
   
   That sounds not reasonable. E.g., failing an input of Integer type for 
`TypeCollection[Long, Double]`.


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