Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15880#discussion_r97471739
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -1728,4 +1728,9 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
val df = spark.createDataFrame(spark.sparkContext.makeRDD(rows),
schema)
assert(df.filter($"array1" === $"array2").count() == 1)
}
+
+ test("SPARK-17913: compare long and string type column may return
confusing result") {
+ val df = Seq(123L -> "123", 19157170390056973L ->
"19157170390056971").toDF("i", "j")
--- End diff --
"returning null when not castable" is an existing behavior, this PR just
changes the target type of cast when comparing string and atomic types.
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