HyukjinKwon commented on pull request #31306:
URL: https://github.com/apache/spark/pull/31306#issuecomment-766466106


   Actually, why is `regexp_extract_all` added into `functions.scala` 
@cloud-fan and @beliefer? This function more looks for SQL compliance instead 
of language friendly APIs. Can we instead remove the Scala function version? 
It's also described here: 
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L41-L59
   
   


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