code: private void parseSetItem(UpdateQueryBuilder query)
    {
      Token token;
  
      if ((token = scanToken()) != Token.IDENTIFIER) {
        throw error(L.l("expected identifier at '{0}'", token));
      }
  
      String columnName = _lexeme;
  
      if ((token = scanToken()) != Token.EQ) {
        throw error("expected '=' at {0}", token);
      }
  
      ExprKraken expr = parseExpr();
  
      query.addItem(columnName, expr);
    }
docs: Parses a set item.