iRakson commented on issue #27836: [SPARK-31009][SQL] Support json_object_keys function URL: https://github.com/apache/spark/pull/27836#issuecomment-602163070 > The function works for literals but I got NPE on a column with JSON objects: > > ```scala > test("json_object_keys") { > spark.sql("""select json_object_keys('{"a": 1, "b": 2, "c": 3}')""").show(false) > val df = Seq( > """{"a":1}""", > """{"a":1, "b":2}""", > """{"a": 1, "b": 2, "c": 3}""").toDF("json") > df.show(false) > val dfKeys = df.selectExpr("json_object_keys(json)") > dfKeys.show(false) > } > ``` > > ``` > +------------------------------------------+ > |json_object_keys({"a": 1, "b": 2, "c": 3})| > +------------------------------------------+ > |[a, b, c] | > +------------------------------------------+ > > +------------------------+ > |json | > +------------------------+ > |{"a":1} | > |{"a":1, "b":2} | > |{"a": 1, "b": 2, "c": 3}| > +------------------------+ > > 06:28:11.089 ERROR org.apache.spark.executor.Executor: Exception in task 0.0 in stage 3.0 (TID 3) > java.lang.NullPointerException > at org.apache.spark.sql.catalyst.InternalRow$.$anonfun$getAccessor$16(InternalRow.scala:152) > ... > Caused by: java.lang.NullPointerException > at org.apache.spark.sql.catalyst.InternalRow$.$anonfun$getAccessor$16(InternalRow.scala:152) > at org.apache.spark.sql.catalyst.InternalRow$.$anonfun$getAccessor$16$adapted(InternalRow.scala:151) > at org.apache.spark.sql.catalyst.expressions.BoundReference.eval(BoundAttribute.scala:41) > at org.apache.spark.sql.catalyst.expressions.JsonObjectKeys.json$lzycompute(jsonExpressions.scala:812) > at org.apache.spark.sql.catalyst.expressions.JsonObjectKeys.json(jsonExpressions.scala:812) > ``` I fixed this issue and also added a new test case for this particular issue.
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