case sqlFnDateAdd:
		return handleDateAdd(r, e.DateAdd, tableAlias)

	case sqlFnDateDiff:
		return handleDateDiff(r, e.DateDiff, tableAlias)

	}

	// For all simple argument functions, we evaluate the arguments here
	argVals := make([]*Value, len(e.SFunc.ArgsList))
	for i, arg := range e.SFunc.ArgsList {
		argVals[i], err = arg.evalNode(r, tableAlias)
		if err != nil {
			return nil, err
		}
	}