Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/18641#discussion_r150839052
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -2158,4 +2158,21 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
val mean = result.select("DecimalCol").where($"summary" === "mean")
assert(mean.collect().toSet ===
Set(Row("0.0345678900000000000000000000000000000")))
}
+
+ testQuietly("SPARK-21413: Multiple projections with CASE WHEN fails") {
+ val schema = StructType(StructField("a", IntegerType) :: Nil)
+ val df = spark.createDataFrame(sparkContext.parallelize(Seq(Row(1))),
schema)
+ val df1 =
+ df.withColumn("a", when($"a" === 0, null).otherwise($"a"))
--- End diff --
Sure, the following code can throw an exception
```
...
var df1 = df
for (i <- 1 to 10) {
df1 = df1.withColumn("a", when($"a" === 0, null).otherwise($"a"))
}
...
```
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