Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/7774#discussion_r36039842
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/BroadcastHashJoin.scala
---
@@ -58,13 +58,26 @@ case class BroadcastHashJoin(
override def requiredChildDistribution: Seq[Distribution] =
UnspecifiedDistribution :: UnspecifiedDistribution :: Nil
+ /**
+ * Use lazy so that we won't do broadcast when calling explain but still
cache the broadcast value
+ * for the same query.
+ */
@transient
- private val broadcastFuture = future {
- // Note that we use .execute().collect() because we don't want to
convert data to Scala types
- val input: Array[InternalRow] =
buildPlan.execute().map(_.copy()).collect()
- val hashed = HashedRelation(input.iterator, buildSideKeyGenerator,
input.size)
- sparkContext.broadcast(hashed)
- }(BroadcastHashJoin.broadcastHashJoinExecutionContext)
+ private lazy val broadcastFuture = {
+ // broadcastFuture is used in "doExecute". Therefore we can get the
execution id correctly here.
+ val executionId =
sparkContext.getLocalProperty(SparkSQLExecution.EXECUTION_ID_KEY)
+ Future {
--- End diff --
The old code used lower case `future`. Does this change anything? (probably
not, but just wondering)
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