Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/15354#discussion_r85248522
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonUtils.scala
---
@@ -29,4 +31,28 @@ object JacksonUtils {
case x => x != stopOn
}
}
+
+ /**
+ * Verify if the schema is supported in JSON parsing.
+ */
+ def verifySchema(schema: StructType): Unit = {
+ def verifyType(dataType: DataType): Unit = dataType match {
+ case NullType | BooleanType | ByteType | ShortType | IntegerType |
LongType | FloatType |
+ DoubleType | StringType | TimestampType | DateType | BinaryType
| _: DecimalType =>
+
+ case st: StructType => st.map(_.dataType).foreach(verifyType)
+
+ case at: ArrayType => verifyType(at.elementType)
+
+ case mt: MapType => verifyType(mt.keyType)
+
+ case udt: UserDefinedType[_] => verifyType(udt.sqlType)
+
+ case _ =>
+ throw new UnsupportedOperationException(
+ s"JSON conversion does not support to process
${dataType.simpleString} type.")
--- End diff --
`does not support to process` is a little hard to parse. Maybe `Unable to
convert column ${name} of type ${dataType.simpleString} to JSON.`
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