Github user liufengdb commented on a diff in the pull request:
https://github.com/apache/spark/pull/19394#discussion_r142290483
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala ---
@@ -280,13 +280,20 @@ abstract class SparkPlan extends QueryPlan[SparkPlan]
with Logging with Serializ
results.toArray
}
+ private[spark] def executeCollectIterator(): (Long,
Iterator[InternalRow]) = {
+ val countsAndBytes = getByteArrayRdd().collect()
--- End diff --
This still fetches all the compressed rows to the driver, before building
the hashed relation. Ideally, you should fetch the rows from executors
incrementally.
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