Github user harsha2010 commented on a diff in the pull request:
https://github.com/apache/spark/pull/5714#discussion_r29155350
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -71,6 +71,26 @@ class SQLQuerySuite extends QueryTest with
BeforeAndAfterAll {
)
}
+ test("SPARK-7158 collect and take return different results") {
+ import java.util.UUID
+ import org.apache.spark.sql.types._
+ val rdd = sparkContext.parallelize(List(1,2,3), 2)
+ val schema = StructType(List(StructField("index",IntegerType,true)))
+ val df = createDataFrame(rdd.map(p => Row(p)), schema)
+ def id:() => String = () => {UUID.randomUUID().toString()}
+ def square:Int => Int = (x: Int) => {x * x}
+ //expect the ID to have materialized at this point
+ val dfWithId = df.withColumn("id",callUDF(id, StringType)).cache()
+ val d1 = dfWithId.collect()
+
+ // ID should not be changed, as we will take the data from the cache
directly
--- End diff --
this test could be simpler... no need for the additional dfWithIdAndSquare
column or the square function...
if we were not reading from cache, two consecutive invocations of
dfWithId.collect will yield different IDs.
Makes the test simpler.
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