Method has_sequence

lib/sqlalchemy/dialects/postgresql/base.py:3836–3844

(self, connection, sequence_name, schema=None, **kw)

    @reflection.cache
    def has_sequence(self, connection, sequence_name, schema=None, **kw):
        query = select(pg_catalog.pg_class.c.relname).where(
            pg_catalog.pg_class.c.relkind == "S",
            pg_catalog.pg_class.c.relname == sequence_name,
        )
        query = self._pg_class_filter_scope_schema(
            query, schema, scope=ObjectScope.ANY
        )
        return bool(connection.scalar(query))

    @reflection.cache
    def has_type(self, connection, type_name, schema=None, **kw):