Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22775#discussion_r227239024
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -770,8 +776,17 @@ case class SchemaOfJson(
factory
}
- override def convert(v: UTF8String): UTF8String = {
- val dt =
Utils.tryWithResource(CreateJacksonParser.utf8String(jsonFactory, v)) { parser
=>
+ @transient
+ private lazy val json = child.eval().asInstanceOf[UTF8String]
--- End diff --
It is possible and that's one case I am trying to disallow here.
`from_json` only accepts `schema_of_json` when the input is literals. I can't
imagine a proper usecase by DDL formatted strings from a JSON column.
The main purpose of this expression was `from_json(..., schema =
schema_of_json(...))`. I was trying to allow what I need only.
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