Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/8953#discussion_r41454228 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateMutableProjection.scala --- @@ -26,7 +26,10 @@ abstract class BaseMutableProjection extends MutableProjection /** * Generates byte code that produces a [[MutableRow]] object that can update itself based on a new - * input [[InternalRow]] for a fixed set of [[Expression Expressions]]. + * input [[InternalRow]] for a fixed set of [[Expression Expressions]]. It exposes a `target` + * method. This method is used to set the row that will be updated. So, when `target` is used, the + * [[MutableRow]] object created internally will not be used. If `target` is not used, the + * [[MutableRow]] object created internally will be used. --- End diff -- oh got it
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