BE-525: HashQL: Remove implicit type-widening from Integer operations, and make comparison size aware#8693
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PR SummaryMedium Risk Overview The Reviewed by Cursor Bugbot for commit bf3b42f. Bugbot is set up for automated code reviews on this repo. Configure here. |
🤖 Augment PR SummarySummary: This PR fixes HashQL MIR interpreter integer semantics by removing implicit type-widening on overflow and making comparisons size-aware. Changes:
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #8693 +/- ##
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- Coverage 59.02% 59.00% -0.03%
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Files 1341 1341
Lines 129299 129178 -121
Branches 5823 5803 -20
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- Hits 76317 76219 -98
+ Misses 52085 52074 -11
+ Partials 897 885 -12
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Merging this PR will not alter performance
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Merge activity
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Benchmark results
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| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| resolve_policies_for_actor | user: empty, selectivity: high, policies: 2002 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: medium, policies: 1001 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: high, policies: 3314 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: medium, policies: 1526 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: high, policies: 2078 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: medium, policies: 1033 | Flame Graph |
policy_resolution_medium
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| resolve_policies_for_actor | user: empty, selectivity: high, policies: 102 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: medium, policies: 51 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: high, policies: 269 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: medium, policies: 107 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: high, policies: 133 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: medium, policies: 63 | Flame Graph |
policy_resolution_none
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| resolve_policies_for_actor | user: empty, selectivity: high, policies: 2 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: medium, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: high, policies: 8 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: medium, policies: 3 | Flame Graph |
policy_resolution_small
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| resolve_policies_for_actor | user: empty, selectivity: high, policies: 52 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: empty, selectivity: medium, policies: 25 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: high, policies: 94 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: seeded, selectivity: medium, policies: 26 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: high, policies: 66 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: low, policies: 1 | Flame Graph | |
| resolve_policies_for_actor | user: system, selectivity: medium, policies: 29 | Flame Graph |
read_scaling_complete
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| entity_by_id;one_depth | 1 entities | Flame Graph | |
| entity_by_id;one_depth | 10 entities | Flame Graph | |
| entity_by_id;one_depth | 25 entities | Flame Graph | |
| entity_by_id;one_depth | 5 entities | Flame Graph | |
| entity_by_id;one_depth | 50 entities | Flame Graph | |
| entity_by_id;two_depth | 1 entities | Flame Graph | |
| entity_by_id;two_depth | 10 entities | Flame Graph | |
| entity_by_id;two_depth | 25 entities | Flame Graph | |
| entity_by_id;two_depth | 5 entities | Flame Graph | |
| entity_by_id;two_depth | 50 entities | Flame Graph | |
| entity_by_id;zero_depth | 1 entities | Flame Graph | |
| entity_by_id;zero_depth | 10 entities | Flame Graph | |
| entity_by_id;zero_depth | 25 entities | Flame Graph | |
| entity_by_id;zero_depth | 5 entities | Flame Graph | |
| entity_by_id;zero_depth | 50 entities | Flame Graph |
read_scaling_linkless
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| entity_by_id | 1 entities | Flame Graph | |
| entity_by_id | 10 entities | Flame Graph | |
| entity_by_id | 100 entities | Flame Graph | |
| entity_by_id | 1000 entities | Flame Graph | |
| entity_by_id | 10000 entities | 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
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/book/v/1
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/building/v/1
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/organization/v/1
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/page/v/2
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/person/v/1
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/playlist/v/1
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/song/v/1
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| entity_by_id | entity type ID: https://blockprotocol.org/@alice/types/entity-type/uk-address/v/1
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representative_read_entity_type
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| get_entity_type_by_id | Account ID: bf5a9ef5-dc3b-43cf-a291-6210c0321eba
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representative_read_multiple_entities
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| entity_by_property | traversal_paths=0 | 0 | |
| entity_by_property | traversal_paths=255 | 1,resolve_depths=inherit:1;values:255;properties:255;links:127;link_dests:126;type:true | |
| entity_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:0;properties:0;links:0;link_dests:0;type:false | |
| entity_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:0;properties:0;links:1;link_dests:0;type:true | |
| entity_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:0;properties:2;links:1;link_dests:0;type:true | |
| entity_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:2;properties:2;links:1;link_dests:0;type:true | |
| link_by_source_by_property | traversal_paths=0 | 0 | |
| link_by_source_by_property | traversal_paths=255 | 1,resolve_depths=inherit:1;values:255;properties:255;links:127;link_dests:126;type:true | |
| link_by_source_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:0;properties:0;links:0;link_dests:0;type:false | |
| link_by_source_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:0;properties:0;links:1;link_dests:0;type:true | |
| link_by_source_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:0;properties:2;links:1;link_dests:0;type:true | |
| link_by_source_by_property | traversal_paths=2 | 1,resolve_depths=inherit:0;values:2;properties:2;links:1;link_dests:0;type:true |
scenarios
| Function | Value | Mean | Flame graphs |
|---|---|---|---|
| full_test | query-limited | Flame Graph | |
| full_test | query-unlimited | Flame Graph | |
| linked_queries | query-limited | Flame Graph | |
| linked_queries | query-unlimited | Flame Graph |

🌟 What is the purpose of this PR?
Integer arithmetic in the MIR interpreter previously silently promoted overflowing
i128operations to floating-point results via aNumericenum. This was semantically incorrect: the language specifies arbitrary-precision integers, and silently widening tof64loses precision and masks errors. This PR replaces that silent promotion with explicit overflow detection, surfacing a user-facingIntegerOverflowruntime error when addition, subtraction, or negation exceeds the 128-bit range supported by the interpreter.As a side effect, the
Inttype's equality, ordering, and hashing semantics are corrected so that booleans (1-bit integers) are treated as a distinct type from integers (128-bit), rather than comparing equal to numeric integers with the same value. This restores type-level correctness forBoolvsIntcomparisons throughout the value layer.🔍 What does this change?
RuntimeError::IntegerOverflowvariant with anoperationfield, and a correspondinginteger_overflowdiagnostic emitted under theRuntimeLimitcategory with a note that the interpreter supports up to 128-bit integers.Neg,Add<Int>, andSub<Int>operator impls onInt(which returnedNumericand silently promoted tof64on overflow) withchecked_neg,checked_add, andchecked_submethods that returnOption<Int>.Numericenum entirely, along with theFrom<Numeric> for Valueconversion and all associated forwarding impls.RuntimeError::IntegerOverflowonNone.Int'sPartialEq,Ord, andHashimplementations to include thesizefield, so thatInt::from(true)(1-bit) andInt::from(1_i32)(128-bit) are no longer considered equal.PartialEq<Int> for Num,PartialOrd<Int> for Num, and their reverses to returnfalse/Nonewhen theIntis a boolean, since booleans are not a subtype ofNumber.Value::Ordto guard the cross-typeInteger/Numberordering arms with!this.is_bool()/!other.is_bool().InstSimplifyVisitor::eval_un_opto returnOption<Int>and skip constant folding for negation ofi128::MIN.inst_simplifytest confirming thatneg(i128::MIN)is not folded.int.rsandmod.rsto reflect the corrected bool/int distinction.Pre-Merge Checklist 🚀
🚢 Has this modified a publishable library?
This PR:
📜 Does this require a change to the docs?
The changes in this PR:
🕸️ Does this require a change to the Turbo Graph?
The changes in this PR:
🛡 What tests cover this?
integer_add_overflow,integer_sub_overflow,integer_neg_overflow— each confirms aRuntimeLimitdiagnostic is produced.inst_simplifytest:const_fold_neg_overflow— confirms that negation ofi128::MINis left unfolded.IntandValuecovering corrected equality, ordering, hashing, and cross-typeNum/Intcomparisons.❓ How to test this?
cargo test -p hashql-mirand confirm all tests pass.const_fold_neg_overflow.snapmatches the expected unfold output.RuntimeLimitand a message referencing the 128-bit limit.