code: public static byte schemaToColumnType(String s) {
          switch (s.toLowerCase()) {
              case "boolean":
              case "smallint":
              case "tinyint":
              case "bigint":  // FIXME: make sure this is fixed by Tomas.
              case "int":
              case "float":
              case "double":
              case "decimal":
                  return Vec.T_NUM;
              case "timestamp":
              case "date":
                  return Vec.T_TIME;
              case "enum":
                  return Vec.T_CAT;
              case "string":
              case "varchar":
  //      case "binary":  // Removed binary column type support for now
              case "char":
                  return Vec.T_STR;
              default:
                  throw new IllegalArgumentException("Unsupported Orc schema type: " + s);
          }
      }
docs: Transform Orc column types into H2O type.
  
  @param s  Orc data type
  @return  a byte representing H2O column type
  @throws IllegalArgumentException  if schema is not supported