Remove Generic from expressions#2750
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kevinjqliu merged 3 commits intoapache:mainfrom Nov 18, 2025
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From the beginning we had these Generic in the expressions system, but it really never worked as we hoped. It came from Java where Generics are much stronger, but the static typing of Python/mypy doesn't really follow the types.
kevinjqliu
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LGTM! mypy is happy too
sungwy
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Nov 18, 2025
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Thank you for the PR @Fokko !
I think @kevinjqliu beat me to the punch while I was reviewing it, but I left some comments. 😄
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| @abstractmethod | ||
| def visit_equal(self, term: BoundTerm[L], literal: Literal[L]) -> T: | ||
| def visit_equal(self, term: BoundTerm, literal: Literal[L]) -> T: |
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nit, but do you think it would make sense to align with your change in expressions/__init__.py and use LiteralValue here?
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| def visit_equal(self, term: BoundTerm, literal: Literal[L]) -> T: | |
| def visit_equal(self, term: BoundTerm, literal: LiteralValue) -> T: |
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| if TYPE_CHECKING: | ||
| LiteralValue = Literal[Any] | ||
| else: | ||
| LiteralValue = Literal |
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What are your thoughts on moving this to pyiceberg.typedef instead? I think that'll allow it to be reused by other modules for static type checking.
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good one! sorry i merged it before you got a chance to submit your reviews
Looks like Fokko has followed up with #2769 :)
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Rationale for this change
This is a big one, and was on my mind for a long time, but I think we should clean this up before a 1.x release.
I bumped into this once more when I tried to extend from the
IcebergBaseModel, but that did not work well with theGeneric.From the beginning we had these Generic in the expressions system, but it really never worked as we hoped. It came from Java where Generics are much stronger, but the static typing of Python/mypy doesn't really follow the types.
Are these changes tested?
Are there any user-facing changes?