Found by the route harness (#2061, attenuation ledger) and the SNB sentinel at master 86de0f5.
What. polars_seeded_lane_admits (the polars seeded lane's shape gate) admits single-hop shapes whose alias collides with a column ([n({"id": 30}, name="m"), e_forward({"type": "HAS_CREATOR"}, name="type"), n(name="p")] and the other 9 alias-collision shapes in the collision matrix), but _try_seeded_chain_polars declines them in its body, so they run the full polars chain. The harness records each as xfail: admitted by the predicate, declined by the lane body; the serve-ratio pin passes only because the corpus has more served shapes than declined ones.
Cost. SNB point-latency sentinel (SF0.1, dgx-spark, run snb-sentinel-86de0f5d5-r2-r1): polars/native-hop-alias-collision 29.3 ms median (served=false) against pandas/native-hop-alias-collision 1.9 ms and polars/native-named-hop 6.7 ms. The point was a known error until #2046; pyg-bench now bounds it at 60 ms with this issue as the note.
Expected. Either the lane serves alias-collision shapes (the pandas/cuDF lane does, marker-authoritative after #2046) or the predicate declines them so the gate describes the lane. The harness cells flip from xfail to pass when the lane serves.
Pins. graphistry/tests/compute/gfql/routes/test_route_harness.py (polars-seeded × collision.served / routes.corpus alias shapes), pyg-bench benchmarks/snb_point_latency/thresholds.json (polars/native-hop-alias-collision).
Found by the route harness (#2061, attenuation ledger) and the SNB sentinel at master 86de0f5.
What.
polars_seeded_lane_admits(the polars seeded lane's shape gate) admits single-hop shapes whose alias collides with a column ([n({"id": 30}, name="m"), e_forward({"type": "HAS_CREATOR"}, name="type"), n(name="p")]and the other 9 alias-collision shapes in the collision matrix), but_try_seeded_chain_polarsdeclines them in its body, so they run the full polars chain. The harness records each asxfail: admitted by the predicate, declined by the lane body; the serve-ratio pin passes only because the corpus has more served shapes than declined ones.Cost. SNB point-latency sentinel (SF0.1, dgx-spark, run
snb-sentinel-86de0f5d5-r2-r1):polars/native-hop-alias-collision29.3 ms median (served=false) againstpandas/native-hop-alias-collision1.9 ms andpolars/native-named-hop6.7 ms. The point was a known error until #2046; pyg-bench now bounds it at 60 ms with this issue as the note.Expected. Either the lane serves alias-collision shapes (the pandas/cuDF lane does, marker-authoritative after #2046) or the predicate declines them so the gate describes the lane. The harness cells flip from xfail to pass when the lane serves.
Pins.
graphistry/tests/compute/gfql/routes/test_route_harness.py(polars-seeded × collision.served / routes.corpus alias shapes), pyg-benchbenchmarks/snb_point_latency/thresholds.json(polars/native-hop-alias-collision).