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[SPARK-12662][SQL] Fix DataFrame.randomSplit to avoid creating overlapping splits #10626

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[SPARK-12662][SQL] Fix DataFrame.randomSplit to avoid creating overlapping splits #10626

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27288a3
Fix DataFrame.randomSplit to avoid creating overlapping splits
sameeragarwal Jan 7, 2016
6336832
Reynold's comments
sameeragarwal Jan 7, 2016
8c3293c
s/logicalPlanWithLocalSort/sorted
sameeragarwal Jan 7, 2016
be9630f
test for single seed
sameeragarwal Jan 7, 2016
56d9bd7
single seed + check for deterministic results across multiple runs
sameeragarwal Jan 7, 2016
3af6a2d
Remove size checks
sameeragarwal Jan 7, 2016
1b30119
Simplify test
sameeragarwal Jan 7, 2016
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Remove size checks
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@sameeragarwal
sameeragarwal committed Jan 7, 2016
commit 3af6a2db857e9140f0fc5683c3ce8fc6b5f73d64
6 changes: 0 additions & 6 deletions sql/core/src/test/scala/org/apache/spark/sql/DataFrameStatSuite.scala
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Expand Up @@ -80,12 +80,6 @@ class DataFrameStatSuite extends QueryTest with SharedSQLContext {
s"split $id overlaps with split ${(id + 1) % splits.length}")
}

// Verify sample sizes
val s = splits.map(_.count())
assert(math.abs(s(0) - 100) < 50) // std = 9.13
assert(math.abs(s(1) - 200) < 50) // std = 11.55
assert(math.abs(s(2) - 300) < 50) // std = 12.25

// Verify that the results are deterministic across multiple runs
val firstRun = splits.toSeq.map(_.collect().toSeq)
val secondRun = data.randomSplit(Array[Double](1, 2, 3), seed = 1).toSeq.map(_.collect().toSeq)
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