Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6570#discussion_r31492468
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala ---
@@ -453,6 +454,44 @@ class ColumnExpressionSuite extends QueryTest {
assert(row.getDouble(1) <= 1.0)
assert(row.getDouble(1) >= 0.0)
}
+
+ def checkNumProjects(df: DataFrame, expectedNumProjects: Int): Unit = {
+ val projects = df.queryExecution.executedPlan.collect {
+ case project: Project => project
+ }
+ assert(projects.size === expectedNumProjects)
+ }
+
+ // We first create a plan with two Projects.
+ // Project [rand + 1 AS rand1, rand - 1 AS rand2]
+ // Project [key, Rand 5 AS rand]
+ // LogicalRDD [key, value]
+ // Because Rand function is not deterministic, the column rand is not
deterministic.
+ // So, in the optimizer, we will not collapse Project [rand + 1 AS
rand1, rand - 1 AS rand2]
+ // and Project [key, Rand 5 AS rand]. The final plan still has two
Projects.
+ val dfWithTwoProjects =
+ testData
+ .select('key, rand(5L).as("rand"))
--- End diff --
let's make the base
(rand(5L) + 1)
to make sure we can catch nested nondeterministic things.
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