[ty] Optimize `IntersectionType` for the common case of a single negated element by AlexWaygood · Pull Request #22344 · astral-sh/ruff

AlexWaygood · 2026-01-02T19:10:06Z

Summary

We call Type::negate() a lot across the codebase. In most cases, it creates an intersection type with 0 positive elements and a single negative element.

Our representation of IntersectionType is currently not very well optimised for this very common case, however: no matter how many negative elements are in the intersection, we always use an FxOrderSet to store these negative elements. I believe that, like most generic Rust collections, OrderSet does not allocate if it has 0 elements contained inside it, but performs a heap allocation as soon as a single element is allocated.

This PR gets rid of the heap allocation for the common case of a single negative element. This leads to across-the-board speedups of 1-4%, including a 4-5% speedup on colour-science, one of the benchmarks on which we currently do worst.

Test Plan

Existing tests all pass and the primer report is clean (except for the known set of flakes).

astral-sh-bot · 2026-01-02T19:11:43Z

Diagnostic diff on typing conformance tests

No changes detected when running ty on typing conformance tests ✅

astral-sh-bot · 2026-01-02T19:12:58Z

`mypy_primer` results

Changes were detected when running on open source projects

pydantic (https://github.com/pydantic/pydantic)
- pydantic/fields.py:943:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`
+ pydantic/fields.py:943:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`
- pydantic/fields.py:983:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`
+ pydantic/fields.py:983:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`
- pydantic/fields.py:1026:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`
+ pydantic/fields.py:1026:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`
- pydantic/fields.py:1066:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`
+ pydantic/fields.py:1066:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`
- pydantic/fields.py:1109:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`
+ pydantic/fields.py:1109:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`
- pydantic/fields.py:1148:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`
+ pydantic/fields.py:1148:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`
- pydantic/fields.py:1188:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`
+ pydantic/fields.py:1188:5: error[invalid-parameter-default] Default value of type `PydanticUndefinedType` is not assignable to annotated parameter type `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`
- pydantic/fields.py:1567:13: error[invalid-argument-type] Argument is incorrect: Expected `dict[str, Divergent] | ((dict[str, Divergent], /) -> None) | None`, found `Top[dict[Unknown, Unknown]] | (((dict[str, Divergent], /) -> None) & ~Top[dict[Unknown, Unknown]]) | None`
+ pydantic/fields.py:1567:13: error[invalid-argument-type] Argument is incorrect: Expected `dict[str, int | float | str | ... omitted 3 union elements] | ((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) | None`, found `Top[dict[Unknown, Unknown]] | (((dict[str, int | float | str | ... omitted 3 union elements], /) -> None) & ~Top[dict[Unknown, Unknown]]) | None`

scikit-build-core (https://github.com/scikit-build/scikit-build-core)
- src/scikit_build_core/build/wheel.py:98:20: error[no-matching-overload] No overload of bound method `__init__` matches arguments
- Found 48 diagnostics
+ Found 47 diagnostics

prefect (https://github.com/PrefectHQ/prefect)
- src/integrations/prefect-dbt/prefect_dbt/core/settings.py:94:28: error[invalid-assignment] Object of type `T@resolve_block_document_references | dict[str, Any]` is not assignable to `dict[str, Any]`
+ src/integrations/prefect-dbt/prefect_dbt/core/settings.py:94:28: error[invalid-assignment] Object of type `T@resolve_block_document_references | dict[str, Any] | str | ... omitted 4 union elements` is not assignable to `dict[str, Any]`
- src/integrations/prefect-dbt/prefect_dbt/core/settings.py:99:28: error[invalid-assignment] Object of type `T@resolve_variables | dict[str, Any]` is not assignable to `dict[str, Any]`
+ src/integrations/prefect-dbt/prefect_dbt/core/settings.py:99:28: error[invalid-assignment] Object of type `T@resolve_variables | str | int | ... omitted 4 union elements` is not assignable to `dict[str, Any]`
- src/prefect/cli/deploy/_core.py:86:21: error[invalid-assignment] Object of type `T@resolve_block_document_references | dict[str, Any]` is not assignable to `dict[str, Any]`
+ src/prefect/cli/deploy/_core.py:86:21: error[invalid-assignment] Object of type `T@resolve_block_document_references | dict[str, Any] | str | ... omitted 4 union elements` is not assignable to `dict[str, Any]`
- src/prefect/cli/deploy/_core.py:87:21: error[invalid-assignment] Object of type `T@resolve_variables` is not assignable to `dict[str, Any]`
+ src/prefect/cli/deploy/_core.py:87:21: error[invalid-assignment] Object of type `T@resolve_variables | str | int | ... omitted 4 union elements` is not assignable to `dict[str, Any]`
- src/prefect/deployments/steps/core.py:137:38: error[invalid-argument-type] Argument is incorrect: Expected `T@resolve_variables`, found `T@resolve_block_document_references | dict[str, Any]`
+ src/prefect/deployments/steps/core.py:137:38: error[invalid-argument-type] Argument is incorrect: Expected `T@resolve_variables`, found `T@resolve_block_document_references | dict[str, Any] | str | ... omitted 4 union elements`
- src/prefect/utilities/templating.py:320:13: error[invalid-assignment] Invalid subscript assignment with key of type `object` and value of type `T@resolve_block_document_references | dict[str, Any]` on object of type `dict[str, Any]`
+ src/prefect/utilities/templating.py:320:13: error[invalid-assignment] Invalid subscript assignment with key of type `object` and value of type `T@resolve_block_document_references | dict[str, Any] | str | ... omitted 4 union elements` on object of type `dict[str, Any]`
- src/prefect/utilities/templating.py:323:16: error[invalid-return-type] Return type does not match returned value: expected `T@resolve_block_document_references | dict[str, Any]`, found `list[T@resolve_block_document_references | dict[str, Any] | Unknown]`
+ src/prefect/utilities/templating.py:323:16: error[invalid-return-type] Return type does not match returned value: expected `T@resolve_block_document_references | dict[str, Any]`, found `list[T@resolve_block_document_references | dict[str, Any] | str | ... omitted 5 union elements]`
- src/prefect/utilities/templating.py:437:16: error[invalid-return-type] Return type does not match returned value: expected `T@resolve_variables`, found `dict[object, T@resolve_variables | Unknown]`
+ src/prefect/utilities/templating.py:437:16: error[invalid-return-type] Return type does not match returned value: expected `T@resolve_variables`, found `dict[object, T@resolve_variables | str | int | ... omitted 5 union elements]`
- src/prefect/utilities/templating.py:442:16: error[invalid-return-type] Return type does not match returned value: expected `T@resolve_variables`, found `list[T@resolve_variables | Unknown]`
+ src/prefect/utilities/templating.py:442:16: error[invalid-return-type] Return type does not match returned value: expected `T@resolve_variables`, found `list[T@resolve_variables | str | int | ... omitted 5 union elements]`
- src/prefect/workers/base.py:232:13: error[invalid-argument-type] Argument is incorrect: Expected `T@resolve_variables`, found `T@resolve_block_document_references | dict[str, Any]`
+ src/prefect/workers/base.py:232:13: error[invalid-argument-type] Argument is incorrect: Expected `T@resolve_variables`, found `T@resolve_block_document_references | dict[str, Any] | str | ... omitted 4 union elements`
- src/prefect/workers/base.py:234:20: error[invalid-argument-type] Argument expression after ** must be a mapping type: Found `T@resolve_variables`
+ src/prefect/workers/base.py:234:20: error[invalid-argument-type] Argument expression after ** must be a mapping type: Found `T@resolve_variables | str | int | ... omitted 4 union elements`

static-frame (https://github.com/static-frame/static-frame)
- static_frame/core/bus.py:671:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemLocReduces[Bus[Any], object_]`, found `InterGetItemLocReduces[Top[Index[Any]] | TypeBlocks | Top[Bus[Any]] | ... omitted 6 union elements, object_]`
+ static_frame/core/bus.py:671:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemLocReduces[Bus[Any], object_]`, found `InterGetItemLocReduces[Top[Index[Any]] | Top[Series[Any, Any]] | TypeBlocks | ... omitted 6 union elements, object_]`
- static_frame/core/index.py:580:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemLocReduces[TVContainer_co@loc, TVDtype@Index]`, found `InterGetItemLocReduces[Any | Bottom[Series[Any, Any]], TVDtype@Index]`
+ static_frame/core/index.py:580:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemLocReduces[TVContainer_co@loc, TVDtype@Index]`, found `InterGetItemLocReduces[Top[Series[Any, Any]] | Any, TVDtype@Index]`
- static_frame/core/node_selector.py:526:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemLocReduces[TVContainer_co@InterfaceSelectQuartet, Any]`, found `InterGetItemLocReduces[Unknown | Bottom[Series[Any, Any]], Any]`
+ static_frame/core/node_selector.py:526:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemLocReduces[TVContainer_co@InterfaceSelectQuartet, Any]`, found `InterGetItemLocReduces[Top[Series[Any, Any]] | Unknown, Any]`
- static_frame/core/series.py:772:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemILocReduces[Series[Any, Any], TVDtype@Series]`, found `InterGetItemILocReduces[Top[Index[Any]] | TypeBlocks | Top[Bus[Any]] | ... omitted 6 union elements, generic[object]]`
+ static_frame/core/series.py:772:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemILocReduces[Series[Any, Any], TVDtype@Series]`, found `InterGetItemILocReduces[Series[Any, Any] | TypeBlocks | Batch | ... omitted 6 union elements, generic[object]]`
- static_frame/core/series.py:4072:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemILocReduces[SeriesHE[Any, Any], TVDtype@SeriesHE]`, found `InterGetItemILocReduces[Top[Index[Any]] | TypeBlocks | Top[Bus[Any]] | ... omitted 7 union elements, generic[object]]`
+ static_frame/core/series.py:4072:16: error[invalid-return-type] Return type does not match returned value: expected `InterGetItemILocReduces[SeriesHE[Any, Any], TVDtype@SeriesHE]`, found `InterGetItemILocReduces[Bottom[Series[Any, Any]] | TypeBlocks | Batch | ... omitted 7 union elements, generic[object]]`

pandas-stubs (https://github.com/pandas-dev/pandas-stubs)
+ pandas-stubs/_typing.pyi:1232:16: warning[unused-ignore-comment] Unused blanket `type: ignore` directive
+ tests/frame/test_groupby.py:229:15: error[type-assertion-failure] Type `Series[Any]` does not match asserted type `Series[str | bytes | int | ... omitted 12 union elements]`
+ tests/frame/test_groupby.py:625:15: error[type-assertion-failure] Type `Series[Any]` does not match asserted type `Series[str | bytes | int | ... omitted 12 union elements]`
- Found 5153 diagnostics
+ Found 5156 diagnostics

rotki (https://github.com/rotki/rotki)
- rotkehlchen/chain/decoding/tools.py:97:13: error[invalid-argument-type] Argument to function `decode_transfer_direction` is incorrect: Expected `(A@BaseDecoderTools & BTCAddress) | (A@BaseDecoderTools & ChecksumAddress) | (A@BaseDecoderTools & SubstrateAddress) | (A@BaseDecoderTools & SolanaAddress)`, found `A@BaseDecoderTools`
+ rotkehlchen/chain/decoding/tools.py:99:13: error[invalid-argument-type] Argument to function `decode_transfer_direction` is incorrect: Expected `Sequence[A@BaseDecoderTools]`, found `Unknown | tuple[BTCAddress, ...] | tuple[ChecksumAddress, ...] | tuple[SubstrateAddress, ...] | tuple[SolanaAddress, ...]`
- rotkehlchen/chain/decoding/tools.py:98:13: error[invalid-argument-type] Argument to function `decode_transfer_direction` is incorrect: Expected `(A@BaseDecoderTools & BTCAddress) | (A@BaseDecoderTools & ChecksumAddress) | (A@BaseDecoderTools & SubstrateAddress) | (A@BaseDecoderTools & SolanaAddress) | None`, found `A@BaseDecoderTools | None`
- rotkehlchen/chain/decoding/tools.py:99:13: error[invalid-argument-type] Argument to function `decode_transfer_direction` is incorrect: Expected `Sequence[(A@BaseDecoderTools & BTCAddress) | (A@BaseDecoderTools & ChecksumAddress) | (A@BaseDecoderTools & SubstrateAddress) | (A@BaseDecoderTools & SolanaAddress)]`, found `Unknown | tuple[BTCAddress, ...] | tuple[ChecksumAddress, ...] | tuple[SubstrateAddress, ...] | tuple[SolanaAddress, ...]`
- Found 2095 diagnostics
+ Found 2093 diagnostics

No memory usage changes detected ✅

codspeed-hq · 2026-01-02T19:20:02Z

CodSpeed Performance Report

Merging #22344 will not alter performance

_{Comparing alex/optimize-intersections-single-neg (e1cbb79) with main (24dd149)}

Summary

✅ 23 untouched
⏩ 30 skipped¹

30 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

AlexWaygood · 2026-01-03T10:10:24Z

#22353 applies the same optimisation to IntersectionType::positive(). It might provide an additional speedup on top of the changes in this PR. But the effect of applying the optimisation to IntersectionType::positive looks to be much smaller than the effect of applying it to IntersectionType::negative, and the change adds further complexity. So I'd prefer to consider that as a standalone change after this lands (if this PR is accepted).

MichaReiser

Nice find.

I would be interested in exploring if we can use a Box<[Type<'db>]> in IntersectionType either by:

Use a dedicated union with a Slice (empty or more than one element) and Single (exactly one element)
Use a SmallVec instead

The advantage of using a slice is that it doesn't increase the complexity of the read methods (they can all be abstracted by implementing Deref where the Target is a [T] (use std::slice::from_ref to create a slice from a single element). The ordered set can be converted into a boxed slice using https://docs.rs/ordermap/latest/ordermap/set/struct.OrderSet.html#method.into_boxed_slice (which I believe is as expensive as calling Vec::into_boxed_slice)).

The IntersectionBuilder would keep your existing enum

AlexWaygood · 2026-01-03T17:10:29Z

I would be interested in exploring if we can use a Box<[Type<'db>]> in IntersectionType

I think this might degrade the performance of intersection.negative(db).contains(...), which is called in some very hot methods. But I can try it!

MichaReiser · 2026-01-03T17:35:27Z

I think this might degrade the performance of intersection.negative(db).contains(...), which is called in some very hot methods. But I can try it!

I also just noticed that into_boxed_slice doesn't return &[T] but a custom Slice type... So what I suggested won't work

AlexWaygood · 2026-01-03T17:36:24Z

I also just noticed that into_boxed_slice doesn't return &[T] but a custom Slice type... So what I suggested won't work

right. But I'm trying out your suggestion of a smallvec, just for comparison.

MichaReiser · 2026-01-03T17:38:57Z

right. But I'm trying out your suggestion of a smallvec, just for comparison.

Doesn't that mean that we need to copy (and create a new allocation) for the many elements case?

AlexWaygood · 2026-01-03T17:40:39Z

Doesn't that mean that we need to copy (and create a new allocation) for the many elements case?

Yes. Which is why I didn't go for that in this PR 😄

AlexWaygood · 2026-01-03T18:01:36Z

The codspeed report on the smallvec version does actually seem to indicate a similar level of speedup, and it seems to indicate that a broader range of benchmarks benefit? https://codspeed.io/astral-sh/ruff/branches/alex%2Foptimize-intersections-single-neg-slice?utm_source=github&utm_medium=check&utm_content=details

MichaReiser

This looks good. But I think we have to manually implement PartialEq, Eq and Hash

crates/ty_python_semantic/src/types.rs

…ted element

Co-authored-by: Micha Reiser <[email protected]>

…rsectionElements::recursive_type_normalized_impl`

AlexWaygood · 2026-01-05T15:27:29Z

#22353 applies the same optimisation to IntersectionType::positive(). It might provide an additional speedup on top of the changes in this PR. But the effect of applying the optimisation to IntersectionType::positive looks to be much smaller than the effect of applying it to IntersectionType::negative, and the change adds further complexity. So I'd prefer to consider that as a standalone change after this lands (if this PR is accepted).

I rebased #22353 on main after this landed, and the performance impact was not impressive: #22353 (comment). So it looks like this is best kept as only an optimisation for IntersectionType::negative.

AlexWaygood added performance Potential performance improvement ty Multi-file analysis & type inference labels Jan 2, 2026

AlexWaygood mentioned this pull request Jan 2, 2026

[ty] Optimize Type::negate() by caching expensive invocations of the IntersectionBuilder #22341

Closed

AlexWaygood marked this pull request as ready for review January 2, 2026 19:49

AlexWaygood requested review from carljm, dcreager and sharkdp as code owners January 2, 2026 19:49

AlexWaygood mentioned this pull request Jan 3, 2026

alex/more intersection opt #22353

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MichaReiser reviewed Jan 3, 2026

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MichaReiser self-requested a review January 3, 2026 17:35

AlexWaygood mentioned this pull request Jan 3, 2026

[ty] Optimize IntersectionType for the common case of a single negated element (v2) #22360

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MichaReiser reviewed Jan 4, 2026

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AlexWaygood force-pushed the alex/optimize-intersections-single-neg branch 2 times, most recently from 1dab95e to e17e2c0 Compare January 4, 2026 20:28

AlexWaygood requested a review from MichaReiser January 4, 2026 20:29

MichaReiser reviewed Jan 5, 2026

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crates/ty_python_semantic/src/types.rs Outdated Show resolved Hide resolved

crates/ty_python_semantic/src/types.rs Outdated Show resolved Hide resolved

crates/ty_python_semantic/src/types.rs Outdated Show resolved Hide resolved

AlexWaygood added 2 commits January 5, 2026 12:43

[ty] Optimize IntersectionType for the common case of a single nega…

6e50ec4

…ted element

Use an inner Option

982f0c7

AlexWaygood and others added 7 commits January 5, 2026 12:43

Revert "Use an inner `Option"

252cdd3

improve insert impl

59db58f

fix is_empty impl and add comments

ff410a5

Update crates/ty_python_semantic/src/types.rs

8c6cbdc

Co-authored-by: Micha Reiser <[email protected]>

custom implementations for Eq, PartialEq, Hash

88793d7

improve docs

195b56c

Add NegativeIntersectionElements::normalized_impl and `NegativeInte…

a293de8

…rsectionElements::recursive_type_normalized_impl`

AlexWaygood force-pushed the alex/optimize-intersections-single-neg branch from f929cbc to a293de8 Compare January 5, 2026 12:56

Simplify Eq and Hash

157e840

AlexWaygood requested a review from MichaReiser January 5, 2026 13:05

map and try_map

e1cbb79

AlexWaygood force-pushed the alex/optimize-intersections-single-neg branch from 2d3ca48 to e1cbb79 Compare January 5, 2026 13:26

MichaReiser approved these changes Jan 5, 2026

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AlexWaygood merged commit f3dea6e into main Jan 5, 2026
48 checks passed

AlexWaygood deleted the alex/optimize-intersections-single-neg branch January 5, 2026 13:41

AlexWaygood mentioned this pull request Jan 5, 2026

[ty] Improve performance of Eq and Hash for NegativeIntersectionElements #22397

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CodSpeed Performance Report

Merging #22344 will not alter performance

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