apache/tajo — pull request #246 by charsyam (2014-11-15 16:55:51+00:00)
Title: TAJO-1180: digitValue should throw Exception when char is not in valid range

digitValue in TextUtils
it returns numeric value for hex data.
and. it should handle [0-9a-zA-Z].
but it returns some digit for other ranges.
so. I think it is better throw exception if it is not in valid range.