Github user MaxGekk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21686#discussion_r199883857
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -744,11 +747,42 @@ case class StructsToJson(
override def inputTypes: Seq[AbstractDataType] =
TypeCollection(ArrayType, StructType) :: Nil
}
+/**
+ * A function infers schema of JSON string.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(json[, options]) - Returns schema in the DDL format of
JSON string.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_('[{"col":0}]');
+ array<struct<col:int>>
+ """)
+case class SchemaOfJson(child: Expression)
+ extends UnaryExpression with String2StringExpression with
CodegenFallback {
+
+ private val jsonOptions = new JSONOptions(Map.empty, "UTC")
+ private val jsonFactory = new JsonFactory()
--- End diff --
Thank you for pointing this out. I really didn't know that I have to call
the method.
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