public Builder addIntegerDerivedColumn(String columnName,DateTimeFieldType type){
  derivedColumns.add(new DerivedColumn(columnName,ColumnType.Integer,null,null,type));
  return this;
}

public Builder addIntegerDerivedColumn ( String columnName , DateTimeFieldType type ) { derivedColumns . add ( new DerivedColumn ( columnName , ColumnType . Integer , null , null , type ) ) ; return this ; }
add an integer derived column - for example , the hour of day , etc . uses timezone from the time column metadata
