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
		}
	}

	switch e.getFunctionName() {
	case sqlFnCoalesce:
		return coalesce(argVals)

	case sqlFnNullIf:
		return nullif(argVals[0], argVals[1])