pathwaycom/pathway · error · ValueError

Unsupported direction: {self._direction}

Error message

Unsupported direction: {self._direction}

What it means

Error "Unsupported direction: {self._direction}" thrown in pathwaycom/pathway.

Source

Thrown at python/pathway/stdlib/temporal/_asof_join.py:328

                        prev_id,
                        pw.if_else(
                            cur_t - pw.unwrap(prev_t) < pw.unwrap(next_t) - cur_t,
                            prev_id,
                            next_id,
                        ),
                    ),
                )

            peer_elem = select_nearest(
                m.t,
                m.prev_diff,
                m.next_diff,
                m.ix(m.prev_diff, optional=True).t,
                m.ix(m.next_diff, optional=True).t,
            )

        else:
            raise ValueError(f"Unsupported direction: {self._direction}")
        m += m.select(peer_elem=peer_elem)

        def fill_self(m_self: pw.Table, side: bool):
            return {
                req.output_name: m_self[req.internal_name]
                for req in self._all_cols
                if req.side == side
            }

        def fill_peer(m_self: pw.Table, side: bool):
            reqs = [req for req in self._all_cols if req.side != side]

            reqs_with_default = [req for req in reqs if req.default is not None]
            reqs_wo_default = [req for req in reqs if req.default is None]
            m_with_peer = m_self.filter(m_self.peer_elem.is_not_none())

            res_default = m_self.select(
                **{req.output_name: req.default for req in reqs_with_default}

View on GitHub (pinned to fa2f74a464)

Solutions

1. Use one of Direction.BACKWARD, Direction.FORWARD, or Direction.NEAREST for the asof join.

Example fix

t1.asof_join(t2, t1.t, t2.t, direction=pw.temporal.Direction.BACKWARD)

When it happens

Trigger: Thrown at python/pathway/stdlib/temporal/_asof_join.py:328 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of pathwaycom/pathway@fa2f74a464 (2026-08-15). Data as JSON: /api/errors/46da1b4491305785. Report an issue: GitHub.