Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18930#discussion_r133347400
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/json/JsonSuite.scala
---
@@ -2034,4 +2034,25 @@ class JsonSuite extends QueryTest with
SharedSQLContext with TestJsonData {
}
}
}
+
+ test("SPARK-21677: json_tuple throws NullPointException when column is
null as string type") {
--- End diff --
The end-to-end test at L2047 may not be able to move to
`JsonExpressionsSuite`. We can have some unit test cases similar to L2039 in
`JsonExpressionsSuite` as @gatorsmile suggested.
It is also good to have similar end-to-end tests in `json-functions.sql`.
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