Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18483#discussion_r124978458
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -1047,7 +1047,7 @@ case class Cast(child: Expression, dataType:
DataType, timeZoneId: Option[String
final $rowClass $result = new $rowClass(${fieldsCasts.length});
final InternalRow $tmpRow = $c;
$fieldsEvalCode
- $evPrim = $result.copy();
--- End diff --
this copy is not needed, because we already do the copy when setting
columns to this row.
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