Github user NathanHowell commented on a diff in the pull request: https://github.com/apache/spark/pull/16386#discussion_r100104738 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonParser.scala --- @@ -298,22 +312,22 @@ class JacksonParser( // Here, we pass empty `PartialFunction` so that this case can be // handled as a failed conversion. It will throw an exception as // long as the value is not null. - parseJsonToken(parser, dataType)(PartialFunction.empty[JsonToken, Any]) + parseJsonToken[AnyRef](parser, dataType)(PartialFunction.empty[JsonToken, AnyRef]) } /** * This method skips `FIELD_NAME`s at the beginning, and handles nulls ahead before trying * to parse the JSON token using given function `f`. If the `f` failed to parse and convert the * token, call `failedConversion` to handle the token. */ - private def parseJsonToken( + private def parseJsonToken[R >: Null]( --- End diff -- It states that `R` must be a nullable type. This enables `null: R` to compile and is preferable to the runtime cast `null.asInstanceOf[R]` because it is verified at compile time.
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