perf(gfql): route engine=auto to native polars for polars-frame graphs#1743
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perf(gfql): route engine=auto to native polars for polars-frame graphs#1743lmeyerov wants to merge 3 commits into
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resolve_engine(AUTO) maps polars frames to PANDAS (it predates Engine.POLARS), so g.gfql(query) on a polars-frame graph silently bridged to the generic pandas path: ~3-13x slower on cypher point queries and pandas frames out. Route AUTO to the native polars engine; an honest NotImplementedError (unsupported shape) falls back to the legacy AUTO path — allowed because the user did not pin an engine. Frames in = frames out: AUTO results on polars graphs are now polars. Repro: 2k-node polars graph, seeded 1-hop cypher — AUTO 25.0ms/pandas out before, 9.3ms/polars out after (engine='polars' = 8.8ms); polars-NIE shapes (shortestPath) still answer via the pandas fallback. Fixes the q5 finding in plans/gfql-benchmark-numbers (inferred-engine 13x penalty). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Y6dQEcjdazEnzuvuwf73ZL
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Y6dQEcjdazEnzuvuwf73ZL
…c records The dual-path guards checked hasattr(out, 'to_dict') first, but polars DataFrame HAS to_dict (without orient) — so the polars branch was unreachable and these tests only ever ran because auto silently returned pandas. With auto routing polars-frame graphs natively they now receive polars frames; probe to_dicts first. Assertions (record values) unchanged and still pass on both engines. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Y6dQEcjdazEnzuvuwf73ZL
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July 21, 2026 08:51
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Summary
resolve_engine(AUTO)maps polars frames toEngine.PANDAS(that branch predatesEngine.POLARS), sog.gfql(query)on a polars-frame graph silently bridges to the generic pandas path — measured ~3× on a small seeded cypher query and ~13× on the q5 graph-benchmark shape (seeplans/gfql-benchmark-numbers), with pandas frames coming back out.This routes
engine='auto'(the default) to the native polars engine when both bound frames are polars, with an honest-NotImplementedErrorfallback to the legacy AUTO path — the fallback is permitted here because the user did not pin an engine (the no-silent-fallback contract applies to explicitengine=).gfql()): changingresolve_engineitself would ripple into plotting/util paths that only handle pandas/cudf.Measurements (2k-node polars graph, seeded 1-hop cypher, warm)
'polars'(explicit)Tests
TestAutoEngineRoutesPolarsNative: auto == explicit-polars result (frame-equal, native frames); shortestPath NIEs when pinned but answers via auto fallback.🤖 Generated with Claude Code
https://claude.ai/code/session_01Y6dQEcjdazEnzuvuwf73ZL