Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/9977#issuecomment-159790792
Narrowed down to the following code in jsonExpressions.scala:
```scala
val output = new ByteArrayOutputStream()
val matched = Utils.tryWithResource(
jsonFactory.createGenerator(output, JsonEncoding.UTF8)) {
generator =>
parser.nextToken()
evaluatePath(parser, generator, RawStyle, parsed.get)
}
```
So far, our parser returns the same results `output` for the following two
cases. Both results are `"null"`:
```scala
val tuple: Seq[(String, String)] = ("5", """{"f1": null}""") :: Nil
val df: DataFrame = tuple.toDF("key", "jstring")
val res = df.select(functions.get_json_object($"jstring",
"$.f1")).collect()
```
```scala
val tuple2: Seq[(String, String)] = ("5", """{"f1": "null"}""") :: Nil
val df2: DataFrame = tuple2.toDF("key", "jstring")
val res3 = df2.select(functions.get_json_object($"jstring",
"$.f1")).collect()
```
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