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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def execute(self, expr, params=None, limit='default', **kwargs):
 """ Compile and execute Ibis expression using this backend client interface, returning results in-memory in the appropriate object type Parameters expr : Expr limit : int, default None For expressions yielding result yets; retrieve at most this number of values/rows. Overrides any limit already set on the expression. params : not yet implemented Returns ------- output : input type dependent Table expressions: pandas.DataFrame Array expressions: pandas.Series Scalar expressions: Python scalar value """

        query_ast = self._build_ast_ensure_limit(expr, limit, params=params)
        result = self._execute_query(query_ast, **kwargs)
        return result