Github user jmchung commented on a diff in the pull request:
https://github.com/apache/spark/pull/18930#discussion_r133116488
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/json/JsonSuite.scala
---
@@ -2034,4 +2034,13 @@ class JsonSuite extends QueryTest with
SharedSQLContext with TestJsonData {
}
}
}
+
+ test("SPARK-21677: json_tuple throws NullPointException when column is
null as string type") {
+ checkAnswer(sql(
+ """
+ |SELECT json_tuple('{"a" : 1, "b" : 2}'
+ |, cast(NULL AS STRING), 'b'
+ |, cast(NULL AS STRING), 'a')
+ """.stripMargin), Row(null, "2", null, "1"))
--- End diff --
@viirya Done, the added test case contains column name, constant field
name, and null field name.
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