Yi Tian created SPARK-11990:
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Summary: DataFrame recompute UDF in some situation.
Key: SPARK-11990
URL: https://issues.apache.org/jira/browse/SPARK-11990
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.5.1
Reporter: Yi Tian
Here is codes for reproducing this problem:
{code}
val mkArrayUDF = org.apache.spark.sql.functions.udf[Array[String],String]
((s: String) => {
println("udf called")
Array[String](s+"_part1", s+"_part2")
})
val df = sc.parallelize(Seq(("a"))).toDF("a")
val df2 = df.withColumn("arr",mkArrayUDF(df("a")))
val df3 = df2.withColumn("e0", df2("arr")(0)).withColumn("e1", df2("arr")(1))
df3.collect().foreach(println)
{code}
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