clone method
Implementation
BoxerQueryOption clone() {
BoxerQueryOption newOp = BoxerQueryOption();
newOp.distinct = this.distinct;
newOp.columns = this.columns;
newOp.where = this.where;
newOp.whereArgs = this.whereArgs;
newOp.groupBy = this.groupBy;
newOp.having = this.having;
newOp.orderBy = this.orderBy;
newOp.limit = this.limit;
newOp.offset = this.offset;
return newOp;
}