Github user tianyi commented on a diff in the pull request:
https://github.com/apache/spark/pull/3375#discussion_r21519366
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashOuterJoin.scala
---
@@ -68,62 +68,59 @@ case class HashOuterJoin(
@transient private[this] lazy val DUMMY_LIST = Seq[Row](null)
@transient private[this] lazy val EMPTY_LIST = Seq.empty[Row]
+ @transient private[this] lazy val joinedRow = new JoinedRow()
--- End diff --
to @marmbrus
I move `joinedRow`, `rightNullRow`, `boundCondition` to the beginning of
`leftOuterIterator`, and ran my benchmark again, the result is :
```
CSV: 9935 ms
CSV: 6989 ms
CSV: 7045 ms
Current Mem Usage:508094480
```
without move, the result is :
```
CSV: 10590 ms
CSV: 7022 ms
CSV: 7086 ms
Current Mem Usage:402470616
```
(I don't know why the costs of memory is not around 208145728 in my last
test, maybe something related to my laptop environment.)
Apparently, the costs of memory increased 25%, and the speed is almost the
same.
Is it acceptable?
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