Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16067#discussion_r90177275
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -1697,6 +1697,12 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
expr = "cast((_1 + _2) as boolean)", expectedNonNullableColumns =
Seq("_1", "_2"))
}
+ test("SPARK-17897: Fixed IsNotNull Constraint Inference Rule") {
+ val data = Seq[java.lang.Integer](1, null).toDF("key")
+ checkAnswer(data.filter("not key is not null"), Row(null))
--- End diff --
shall we use DataFrame API? i.e. `data.filter(!$"key".isNotNull)`. The
string version looks weird...
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