MaxGekk commented on a change in pull request #25410: [SPARK-28690][SQL] Add 
the `date_part` function for timestamps and dates
URL: https://github.com/apache/spark/pull/25410#discussion_r312787565
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
 ##########
 @@ -1876,3 +1876,38 @@ case class Decade(child: Expression) extends 
UnaryExpression with ImplicitCastIn
     defineCodeGen(ctx, ev, c => s"$dtu.getDecade($c)")
   }
 }
+
+case class DatePart(field: Expression, source: Expression, child: Expression)
 
 Review comment:
   I added the description. Just in case, can I run the check locally and get 
the error earlier?

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