(self, ixreader)
Returns an estimate of how many documents this query could
        potentially match (for example, the estimated size of a simple term
        query is the document frequency of the term). It is permissible to
        overestimate, but not to underestimate.
Returns an estimate of how many documents this query could
        potentially match (for example, the estimated size of a simple term
        query is the document frequency of the term). It is permissible to
        overestimate, but not to underestimate.
Returns an estimate of how many documents this query could potentially match ( for example the estimated size of a simple term query is the document frequency of the term ) . It is permissible to overestimate but not to underestimate .
def estimate_size(self, ixreader):
        """Returns an estimate of how many documents this query could
        potentially match (for example, the estimated size of a simple term
        query is the document frequency of the term). It is permissible to
        overestimate, but not to underestimate.
        """
        raise NotImplementedError
def estimate_size ( self , ixreader ) : raise NotImplementedError