MaxGekk commented on issue #27836: [SPARK-31009][SQL] Support json_object_keys function URL: https://github.com/apache/spark/pull/27836#issuecomment-602044002 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) ```
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