BE-512: HashQL: Allow cross-backend transitions for SwitchInt terminators by indietyp · Pull Request #8696 · hashintel/hash

indietyp · 2026-05-04T12:52:27Z

🌟 What is the purpose of this PR?

SwitchInt terminators were previously blocked from generating cross-backend transitions during terminator placement, based on an assumption that coordinating branches across backends would be too complex. This restriction has been lifted, allowing SwitchInt to behave the same as Goto and permit cross-backend transitions. This enables more flexible execution placement for conditional branching logic.

🔍 What does this change?

SwitchInt now calls add_goto_transitions instead of being a no-op, enabling cross-backend edge costs to be populated for blocks ending with a SwitchInt terminator.
The test switchint_blocks_cross_backend has been renamed to switchint_allows_cross_backend and updated to assert that the Interpreter -> Embedding transition is now reachable with the expected cost.
The switchint_edge_targets_are_branch_specific test has been updated to assert that cross-backend transitions are present rather than absent.
The terminator placement snapshot has been updated to reflect the newly populated I->E and P->E transitions on edge[1].

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

do not affect the execution graph

🛡 What tests cover this?

Updated unit tests in terminator_placement/tests.rs covering SwitchInt cross-backend transition behaviour.
Updated snapshot test reflecting the new edge cost matrix output.

❓ How to test this?

Run cargo test in libs/@local/hashql/mir.
Confirm all terminator placement tests pass, including the renamed switchint_allows_cross_backend test.

vercel · 2026-05-04T12:52:32Z

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cursor · 2026-05-04T12:52:37Z

PR Summary

Medium Risk
Changes MIR execution planning by allowing additional backend transitions on SwitchInt edges, which can alter placement/cost decisions at runtime. Risk is limited to planning logic and is covered by updated unit + snapshot tests.

Overview
SwitchInt terminator edges are no longer restricted to same-backend / interpreter-only transitions; they now generate the same cross-backend transition matrix entries as Goto during terminator placement.

Updates terminator placement tests (including renaming the SwitchInt cross-backend test) and refreshes the snapshot to assert the newly populated I->E and P->E edge costs.

^{Reviewed by Cursor Bugbot for commit 2a95250. Bugbot is set up for automated code reviews on this repo. Configure here.}

indietyp · 2026-05-04T12:53:08Z

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augmentcode · 2026-05-04T12:53:57Z

🤖 Augment PR Summary

Summary: Enables cross-backend transitions for blocks ending in SwitchInt terminators, aligning their behavior with Goto during terminator placement.
Changes: Updates the edge-cost matrix population logic and adjusts unit/snapshot tests to assert newly reachable cross-backend paths with expected costs.

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codecov · 2026-05-04T12:58:15Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.84%. Comparing base (78f76e2) to head (2a95250).

Additional details and impacted files

@@                           Coverage Diff                           @@
##           bm/be-524-hashql-remove-island-dag    #8696       +/-   ##
=======================================================================
+ Coverage                               67.55%   80.84%   +13.29%     
=======================================================================
  Files                                     401      269      -132     
  Lines                                   44272    37711     -6561     
  Branches                                 2287     1199     -1088     
=======================================================================
+ Hits                                    29906    30487      +581     
+ Misses                                  14083     6941     -7142     
  Partials                                  283      283

Flag	Coverage Δ
apps.hash-ai-worker-ts	`?`
rust.hash-graph-api	`?`
rust.hashql-compiletest	`28.26% <ø> (?)`
rust.hashql-eval	`79.70% <ø> (ø)`
rust.hashql-mir	`91.83% <100.00%> (-0.01%)`	⬇️

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github-actions · 2026-05-04T14:13:25Z

Benchmark results

@rust/hash-graph-benches – Integrations

policy_resolution_large

Function	Value	Mean	Flame graphs
resolve_policies_for_actor	user: empty, selectivity: high, policies: 2002	$$26.9 \mathrm{ms} \pm 161 \mathrm{μs}\left({\color{gray}0.240 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: low, policies: 1	$$3.32 \mathrm{ms} \pm 17.4 \mathrm{μs}\left({\color{gray}-3.541 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: medium, policies: 1001	$$12.0 \mathrm{ms} \pm 79.7 \mathrm{μs}\left({\color{gray}0.089 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: high, policies: 3314	$$41.9 \mathrm{ms} \pm 366 \mathrm{μs}\left({\color{gray}0.874 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: low, policies: 1	$$13.6 \mathrm{ms} \pm 127 \mathrm{μs}\left({\color{lightgreen}-5.582 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: medium, policies: 1526	$$23.2 \mathrm{ms} \pm 197 \mathrm{μs}\left({\color{gray}0.118 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: high, policies: 2078	$$27.9 \mathrm{ms} \pm 223 \mathrm{μs}\left({\color{gray}0.340 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: low, policies: 1	$$3.62 \mathrm{ms} \pm 20.8 \mathrm{μs}\left({\color{gray}-3.641 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: medium, policies: 1033	$$13.0 \mathrm{ms} \pm 90.5 \mathrm{μs}\left({\color{gray}-0.217 \mathrm{\%}}\right) $$	Flame Graph

policy_resolution_medium

Function	Value	Mean	Flame graphs
resolve_policies_for_actor	user: empty, selectivity: high, policies: 102	$$3.69 \mathrm{ms} \pm 22.2 \mathrm{μs}\left({\color{gray}0.004 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: low, policies: 1	$$2.90 \mathrm{ms} \pm 17.1 \mathrm{μs}\left({\color{gray}0.131 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: medium, policies: 51	$$3.26 \mathrm{ms} \pm 17.8 \mathrm{μs}\left({\color{gray}-0.009 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: high, policies: 269	$$5.00 \mathrm{ms} \pm 21.5 \mathrm{μs}\left({\color{gray}-1.179 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: low, policies: 1	$$3.43 \mathrm{ms} \pm 17.4 \mathrm{μs}\left({\color{gray}-0.298 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: medium, policies: 107	$$4.03 \mathrm{ms} \pm 29.7 \mathrm{μs}\left({\color{gray}0.336 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: high, policies: 133	$$4.26 \mathrm{ms} \pm 22.8 \mathrm{μs}\left({\color{gray}-1.183 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: low, policies: 1	$$3.37 \mathrm{ms} \pm 17.8 \mathrm{μs}\left({\color{gray}0.290 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: medium, policies: 63	$$3.94 \mathrm{ms} \pm 25.4 \mathrm{μs}\left({\color{gray}-1.788 \mathrm{\%}}\right) $$	Flame Graph

policy_resolution_none

Function	Value	Mean	Flame graphs
resolve_policies_for_actor	user: empty, selectivity: high, policies: 2	$$2.61 \mathrm{ms} \pm 13.9 \mathrm{μs}\left({\color{gray}0.249 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: low, policies: 1	$$2.44 \mathrm{ms} \pm 17.5 \mathrm{μs}\left({\color{gray}-1.033 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: medium, policies: 1	$$2.56 \mathrm{ms} \pm 15.2 \mathrm{μs}\left({\color{gray}-0.494 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: high, policies: 8	$$2.85 \mathrm{ms} \pm 15.7 \mathrm{μs}\left({\color{gray}-0.909 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: low, policies: 1	$$2.65 \mathrm{ms} \pm 15.3 \mathrm{μs}\left({\color{gray}0.787 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: medium, policies: 3	$$2.85 \mathrm{ms} \pm 15.9 \mathrm{μs}\left({\color{gray}-0.291 \mathrm{\%}}\right) $$	Flame Graph

policy_resolution_small

Function	Value	Mean	Flame graphs
resolve_policies_for_actor	user: empty, selectivity: high, policies: 52	$$2.96 \mathrm{ms} \pm 19.1 \mathrm{μs}\left({\color{gray}-0.049 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: low, policies: 1	$$2.63 \mathrm{ms} \pm 13.2 \mathrm{μs}\left({\color{gray}-0.943 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: empty, selectivity: medium, policies: 25	$$2.87 \mathrm{ms} \pm 14.3 \mathrm{μs}\left({\color{gray}-0.764 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: high, policies: 94	$$3.33 \mathrm{ms} \pm 23.6 \mathrm{μs}\left({\color{gray}-0.394 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: low, policies: 1	$$2.86 \mathrm{ms} \pm 16.6 \mathrm{μs}\left({\color{gray}0.157 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: seeded, selectivity: medium, policies: 26	$$3.19 \mathrm{ms} \pm 19.9 \mathrm{μs}\left({\color{gray}0.018 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: high, policies: 66	$$3.22 \mathrm{ms} \pm 20.0 \mathrm{μs}\left({\color{gray}-0.953 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: low, policies: 1	$$2.84 \mathrm{ms} \pm 16.2 \mathrm{μs}\left({\color{gray}-0.866 \mathrm{\%}}\right) $$	Flame Graph
resolve_policies_for_actor	user: system, selectivity: medium, policies: 29	$$3.21 \mathrm{ms} \pm 16.6 \mathrm{μs}\left({\color{gray}-0.679 \mathrm{\%}}\right) $$	Flame Graph

read_scaling_complete

Function	Value	Mean	Flame graphs
entity_by_id;one_depth	1 entities	$$53.4 \mathrm{ms} \pm 354 \mathrm{μs}\left({\color{gray}0.021 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;one_depth	10 entities	$$44.4 \mathrm{ms} \pm 214 \mathrm{μs}\left({\color{gray}-1.467 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;one_depth	25 entities	$$48.9 \mathrm{ms} \pm 334 \mathrm{μs}\left({\color{gray}0.528 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;one_depth	5 entities	$$43.2 \mathrm{ms} \pm 247 \mathrm{μs}\left({\color{lightgreen}-6.236 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;one_depth	50 entities	$$61.0 \mathrm{ms} \pm 396 \mathrm{μs}\left({\color{gray}0.709 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;two_depth	1 entities	$$60.3 \mathrm{ms} \pm 278 \mathrm{μs}\left({\color{gray}-0.646 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;two_depth	10 entities	$$54.5 \mathrm{ms} \pm 324 \mathrm{μs}\left({\color{gray}-0.399 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;two_depth	25 entities	$$95.2 \mathrm{ms} \pm 436 \mathrm{μs}\left({\color{lightgreen}-5.003 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;two_depth	5 entities	$$45.0 \mathrm{ms} \pm 248 \mathrm{μs}\left({\color{gray}0.546 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;two_depth	50 entities	$$267 \mathrm{ms} \pm 892 \mathrm{μs}\left({\color{gray}-0.135 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;zero_depth	1 entities	$$19.1 \mathrm{ms} \pm 111 \mathrm{μs}\left({\color{gray}-0.042 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;zero_depth	10 entities	$$19.4 \mathrm{ms} \pm 109 \mathrm{μs}\left({\color{gray}-0.342 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;zero_depth	25 entities	$$19.7 \mathrm{ms} \pm 121 \mathrm{μs}\left({\color{gray}-0.560 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;zero_depth	5 entities	$$18.9 \mathrm{ms} \pm 102 \mathrm{μs}\left({\color{gray}0.379 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id;zero_depth	50 entities	$$24.3 \mathrm{ms} \pm 185 \mathrm{μs}\left({\color{gray}-1.394 \mathrm{\%}}\right) $$	Flame Graph

read_scaling_linkless

Function	Value	Mean	Flame graphs
entity_by_id	1 entities	$$18.8 \mathrm{ms} \pm 118 \mathrm{μs}\left({\color{gray}0.540 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	10 entities	$$18.9 \mathrm{ms} \pm 105 \mathrm{μs}\left({\color{gray}-0.499 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	100 entities	$$19.0 \mathrm{ms} \pm 96.2 \mathrm{μs}\left({\color{gray}-1.308 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	1000 entities	$$19.6 \mathrm{ms} \pm 110 \mathrm{μs}\left({\color{gray}-0.382 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	10000 entities	$$25.9 \mathrm{ms} \pm 184 \mathrm{μs}\left({\color{gray}-2.012 \mathrm{\%}}\right) $$	Flame Graph

representative_read_entity

Function	Value	Mean	Flame graphs
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/block/v/1`	$$33.9 \mathrm{ms} \pm 303 \mathrm{μs}\left({\color{gray}-1.762 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/book/v/1`	$$33.4 \mathrm{ms} \pm 274 \mathrm{μs}\left({\color{gray}-3.684 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/building/v/1`	$$33.6 \mathrm{ms} \pm 319 \mathrm{μs}\left({\color{gray}1.26 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/organization/v/1`	$$32.9 \mathrm{ms} \pm 282 \mathrm{μs}\left({\color{gray}-4.063 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/page/v/2`	$$34.0 \mathrm{ms} \pm 282 \mathrm{μs}\left({\color{gray}-3.274 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/person/v/1`	$$33.2 \mathrm{ms} \pm 285 \mathrm{μs}\left({\color{lightgreen}-5.189 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/playlist/v/1`	$$34.0 \mathrm{ms} \pm 285 \mathrm{μs}\left({\color{gray}-0.371 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/song/v/1`	$$34.2 \mathrm{ms} \pm 281 \mathrm{μs}\left({\color{gray}0.352 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: `https://blockprotocol.org/@alice/types/entity-type/uk-address/v/1`	$$34.0 \mathrm{ms} \pm 261 \mathrm{μs}\left({\color{gray}-3.264 \mathrm{\%}}\right) $$	Flame Graph

representative_read_entity_type

Function	Value	Mean	Flame graphs
get_entity_type_by_id	Account ID: `bf5a9ef5-dc3b-43cf-a291-6210c0321eba`	$$8.31 \mathrm{ms} \pm 45.6 \mathrm{μs}\left({\color{gray}-0.083 \mathrm{\%}}\right) $$	Flame Graph

representative_read_multiple_entities

Function	Value	Mean	Flame graphs
entity_by_property	traversal_paths=0	0	$$90.5 \mathrm{ms} \pm 450 \mathrm{μs}\left({\color{gray}0.013 \mathrm{\%}}\right) $$
entity_by_property	traversal_paths=255	1,resolve_depths=inherit:1;values:255;properties:255;links:127;link_dests:126;type:true	$$142 \mathrm{ms} \pm 489 \mathrm{μs}\left({\color{gray}-0.571 \mathrm{\%}}\right) $$
entity_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:0;properties:0;links:0;link_dests:0;type:false	$$97.3 \mathrm{ms} \pm 458 \mathrm{μs}\left({\color{gray}0.065 \mathrm{\%}}\right) $$
entity_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:0;properties:0;links:1;link_dests:0;type:true	$$109 \mathrm{ms} \pm 591 \mathrm{μs}\left({\color{gray}0.686 \mathrm{\%}}\right) $$
entity_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:0;properties:2;links:1;link_dests:0;type:true	$$115 \mathrm{ms} \pm 584 \mathrm{μs}\left({\color{gray}0.471 \mathrm{\%}}\right) $$
entity_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:2;properties:2;links:1;link_dests:0;type:true	$$123 \mathrm{ms} \pm 467 \mathrm{μs}\left({\color{gray}-0.052 \mathrm{\%}}\right) $$
link_by_source_by_property	traversal_paths=0	0	$$101 \mathrm{ms} \pm 469 \mathrm{μs}\left({\color{gray}0.302 \mathrm{\%}}\right) $$
link_by_source_by_property	traversal_paths=255	1,resolve_depths=inherit:1;values:255;properties:255;links:127;link_dests:126;type:true	$$130 \mathrm{ms} \pm 513 \mathrm{μs}\left({\color{gray}0.149 \mathrm{\%}}\right) $$
link_by_source_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:0;properties:0;links:0;link_dests:0;type:false	$$108 \mathrm{ms} \pm 422 \mathrm{μs}\left({\color{gray}0.128 \mathrm{\%}}\right) $$
link_by_source_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:0;properties:0;links:1;link_dests:0;type:true	$$116 \mathrm{ms} \pm 399 \mathrm{μs}\left({\color{gray}-0.722 \mathrm{\%}}\right) $$
link_by_source_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:0;properties:2;links:1;link_dests:0;type:true	$$119 \mathrm{ms} \pm 493 \mathrm{μs}\left({\color{gray}0.173 \mathrm{\%}}\right) $$
link_by_source_by_property	traversal_paths=2	1,resolve_depths=inherit:0;values:2;properties:2;links:1;link_dests:0;type:true	$$118 \mathrm{ms} \pm 524 \mathrm{μs}\left({\color{gray}0.032 \mathrm{\%}}\right) $$

scenarios

Function	Value	Mean	Flame graphs
full_test	query-limited	$$185 \mathrm{ms} \pm 851 \mathrm{μs}\left({\color{red}42.8 \mathrm{\%}}\right) $$	Flame Graph
full_test	query-unlimited	$$166 \mathrm{ms} \pm 2.37 \mathrm{ms}\left({\color{red}17.4 \mathrm{\%}}\right) $$	Flame Graph
linked_queries	query-limited	$$39.5 \mathrm{ms} \pm 224 \mathrm{μs}\left({\color{gray}-0.941 \mathrm{\%}}\right) $$	Flame Graph
linked_queries	query-unlimited	$$568 \mathrm{ms} \pm 1.24 \mathrm{ms}\left({\color{gray}2.42 \mathrm{\%}}\right) $$	Flame Graph

feat: allow for cross switch int transition

2a95250

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graphite-app Bot assigned indietyp May 4, 2026

github-actions Bot added area/libs Relates to first-party libraries/crates/packages (area) type/eng > backend Owned by the @backend team area/tests New or updated tests labels May 4, 2026

indietyp mentioned this pull request May 4, 2026

BE-524: HashQL: Remove island schedule module #8694

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indietyp mentioned this pull request May 4, 2026

BE-513: HashQL: Rework dynamic aggregate size estimation #8697

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BE-512: HashQL: Allow cross-backend transitions for SwitchInt terminators#8696

BE-512: HashQL: Allow cross-backend transitions for SwitchInt terminators#8696
indietyp wants to merge 1 commit into
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bm/be-512-hashql-switchint-allow-cross-backend-transitions

indietyp commented May 4, 2026

Uh oh!

vercel Bot commented May 4, 2026 •

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@rust/hash-graph-benches – Integrations

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indietyp commented May 4, 2026

🌟 What is the purpose of this PR?

🔍 What does this change?

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

📜 Does this require a change to the docs?

🕸️ Does this require a change to the Turbo Graph?

🛡 What tests cover this?

❓ How to test this?

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@rust/hash-graph-benches – Integrations

policy_resolution_large

policy_resolution_medium

policy_resolution_none

policy_resolution_small

read_scaling_complete

read_scaling_linkless

representative_read_entity

representative_read_entity_type

representative_read_multiple_entities

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