docs: public String getColumnTypeName(int column) throws SQLException
      {
          sourceResultSet.checkColumnBounds(column);
          VoltType type = sourceResultSet.table.getColumnType(column - 1);
          String result = type.toSQLString().toUpperCase();
          if (result == null) {
              // Types unknown to JDBC will return null, no other good
              // answer to give
              throw SQLError.get(SQLError.TRANSLATION_NOT_FOUND, type);
          }
          return type.toSQLString().toUpperCase();
      }