Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/11509#discussion_r55076507 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/types/DataType.scala --- @@ -103,7 +103,7 @@ object DataType { /** Given the string representation of a type, return its DataType */ private def nameToType(name: String): DataType = { - val FIXED_DECIMAL = """decimal\(\s*(\d+)\s*,\s*(\d+)\s*\)""".r + val FIXED_DECIMAL = """decimal\(\s*(\d+)\s*,\s*(\-?\d+)\s*\)""".r --- End diff -- [This test case](https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/json/JsonSuite.scala#L782) is hard coded to have a negative value here. I'm not actually sure if thats correct, but I would argue either way that we should be more permissive about parsing (otherwise the error message is `Unknown DataType`) and then throw a more sensible validation failure.
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