def _filter_is_defined(self, columns=None, negate=False):
if columns is None:
columns = range(len(self.domain.variables))
columns = [self.domain[i].to_sql() for i in columns]
t2 = self.copy()
t2.row_filters += (sql_filter.IsDefinedSql(columns, negate), )
return t2
def _filter_has_class(self, negate=False):
columns = [c.to_sql() for c in self.domain.class_vars]
t2 = self.copy()
t2.row_filters += (sql_filter.IsDefinedSql(columns, negate), )
return t2
