String evalPop(HplsqlParser.DtypeContext type, HplsqlParser.Dtype_lenContext len) {
    if (isConvert(exec.conf.defaultConnection)) {
      return exec.converter.dataType(type, len);
    }
    return getText(type, type.getStart(), len == null ? type.getStop() : len.getStop());
  }
Evaluate the data type and length
hplsql/src/main/java/org/apache/hive/hplsql/Exec.java