You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: update_clauses.go
    path of file: ./repos/corteza/server/vendor/github.com/doug-martin/goqu/v9/exp
    
    the code of the file until where you have to start completion: package exp

type (
	UpdateClauses interface {
		HasTable() bool
		clone() *updateClauses

		CommonTables() []CommonTableExpression
		CommonTablesAppend(cte CommonTableExpression) UpdateClauses

		Table() Expression
		SetT
    
func (uc *updateClauses) WhereAppend(expressions ...Expression) UpdateClauses {
	if len(expressions) == 0 {
		return uc
	}
	ret := uc.clone()
	if ret.where == nil {
		ret.where = NewExpressionList(AndType, expressions...)
	} else {
		ret.where = ret.where.Append(expressions...)
	}
	return ret
}