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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