dongjoon-hyun commented on a change in pull request #28226: [SPARK-31452][SQL]
Do not create partition spec for 0-size partitions in AQE
URL: https://github.com/apache/spark/pull/28226#discussion_r409596216
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File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/adaptive/AdaptiveQueryExecSuite.scala
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@@ -156,17 +156,17 @@ class AdaptiveQueryExecSuite
val localShuffleRDD0 =
localReaders(0).execute().asInstanceOf[ShuffledRowRDD]
val localShuffleRDD1 =
localReaders(1).execute().asInstanceOf[ShuffledRowRDD]
// The pre-shuffle partition size is [0, 0, 0, 72, 0]
- // And the partitionStartIndices is [0, 3, 4], so advisoryParallelism =
3.
+ // We exclude the 0-size partitions, so only one partition,
advisoryParallelism = 1
// the final parallelism is
- // math.max(1, advisoryParallelism / numMappers): math.max(1, 3/2) = 1
+ // math.max(1, advisoryParallelism / numMappers): math.max(1, 1/2) = 1
// and the partitions length is 1 * numMappers = 2
assert(localShuffleRDD0.getPartitions.length == 2)
// The pre-shuffle partition size is [0, 72, 0, 72, 126]
- // And the partitionStartIndices is [0, 1, 2, 3, 4], so
advisoryParallelism = 5.
+ // We exclude the 0-size partitions, so only 3 partition,
advisoryParallelism = 3
// the final parallelism is
- // math.max(1, advisoryParallelism / numMappers): math.max(1, 5/2) = 2
- // and the partitions length is 2 * numMappers = 4
- assert(localShuffleRDD1.getPartitions.length == 4)
+ // math.max(1, advisoryParallelism / numMappers): math.max(1, 3/2) = 1
+ // and the partitions length is 2 * numMappers = 2
Review comment:
`2 * numMappers = 2` -> `1 * numMappers = 2`?
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