Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/3217#discussion_r20414930
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Row.scala
---
@@ -42,6 +42,14 @@ object Row {
* This method can be used to construct a [[Row]] from a [[Seq]] of
values.
*/
def fromSeq(values: Seq[Any]): Row = new GenericRow(values.toArray)
+
+ /**
+ * This method can be used to construct a [[MutableRow]] from a [[Row]]
+ */
+ def toMutableRow(row: Row): MutableRow = row match {
--- End diff --
Exposing the mutable row is required in #3247, we want to reuse the row
object as `aggregation buffer`, but you're right, we should make it as instance
method on Row itself.
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