Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/8953#discussion_r41454294
--- 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
--- End diff --
This comment is quite verbose. I think you can just say
```
It exposes a `target` method, which is used to set the row that will be
updated. The internal
[[MutableRow]] object created internally is used only when `target` is not
used.
```
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