Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/993#discussion_r13479600
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Projection.scala
---
@@ -48,14 +48,19 @@ class Projection(expressions: Seq[Expression]) extends
(Row => Row) {
* each time an input row is added. This significatly reduces the cost of
calcuating the
* projection, but means that it is not safe
*/
-case class MutableProjection(expressions: Seq[Expression]) extends (Row =>
Row) {
+case class InterpretedMutableProjection(expressions: Seq[Expression])
extends MutableProjection {
def this(expressions: Seq[Expression], inputSchema: Seq[Attribute]) =
this(expressions.map(BindReferences.bindReference(_, inputSchema)))
private[this] val exprArray = expressions.toArray
- private[this] val mutableRow = new GenericMutableRow(exprArray.size)
+ private[this] var mutableRow: MutableRow = new
GenericMutableRow(exprArray.size)
def currentValue: Row = mutableRow
+ def target(row: MutableRow): MutableProjection = {
--- End diff --
maybe add some scaladoc to explain how this is used?
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