Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18694#discussion_r128667716
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/SortMergeJoinExec.scala
---
@@ -649,6 +660,11 @@ private[joins] class SortMergeJoinScanner(
// Initialization (note: do _not_ want to advance streamed here).
advancedBufferedToRowWithNullFreeJoinKey()
+ def destruct(): Unit = {
+ while (streamedIter.advanceNext()) {}
+ while (bufferedIter.advanceNext()) {}
--- End diff --
can you explain more where is the memory leak? Why we have to exhaust the
iterators?
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