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[SPARK-22144][SQL] ExchangeCoordinator combine the partitions of an 0 sized pre-shuffle to 0 #19364

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[SPARK-22144][SQL] ExchangeCoordinator combine the partitions of an 0 sized pre-shuffle to 0 #19364

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[SPARK-22144][SQL] ExchangeCoordinator combine the partitions of an 0… 
… sized pre-shuffle to 0
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@liutang123
liutang123 committed Oct 14, 2017
commit f0de287a503ed89f27678a25001e7f9514ef3888
6 changes: 3 additions & 3 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ExchangeCoordinator.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -232,16 +232,16 @@ class ExchangeCoordinator(
// number of post-shuffle partitions.
val partitionStartIndices =
if (mapOutputStatistics.length == 0) {
None
Array.empty[Int]
} else {
Some(estimatePartitionStartIndices(mapOutputStatistics))
estimatePartitionStartIndices(mapOutputStatistics)
}

var k = 0
while (k < numExchanges) {
val exchange = exchanges(k)
val rdd =
exchange.preparePostShuffleRDD(shuffleDependencies(k), partitionStartIndices)
exchange.preparePostShuffleRDD(shuffleDependencies(k), Some(partitionStartIndices))
newPostShuffleRDDs.put(exchange, rdd)

k += 1
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