func (field *Field) Expand(oDataExpand string) *Field {
	field.modifiers.AddExpand(oDataExpand)
	return field
}
Expand adds $expand OData modifier
package api
import (
	"encoding/json"
)
func (field *Field) Conf(config *RequestConfig) *Field {
	field.config = config
	return field
}
func (field *Field) Select(oDataSelect string) *Field {
	field.modifiers.AddSelect(oDataSelect)
	return field
}