Add lifetime to token #2112
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Add lifetime to token #2112
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This change introduces a lifetime parameter 'a to BorrowedToken enum
to prepare for zero-copy tokenization support. This is a foundational
step toward reducing memory allocations during SQL parsing.
Changes:
- Added lifetime parameter to BorrowedToken<'a> enum
- Added _Phantom(Cow<'a, str>) variant to carry the lifetime
- Implemented Visit and VisitMut traits for Cow<'a, str> to support
the visitor pattern with the new lifetime parameter
- Fixed lifetime issues in visitor tests by using tokenized_owned()
instead of tokenize() where owned tokens are required
- Type alias Token = BorrowedToken<'static> maintains backward
compatibility
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his PR adds a lifetime parameter to the Token enum to enable zero-copy tokenization in the future.
Backward Compatibility:
To maintain backward compatibility, we renamed Token to BorrowedToken<'a> and introduced Token as a type alias for BorrowedToken<'static>. This allows existing consumers of the library to continue using Token without needing to handle
lifetimes throughout their code.
New API:
This PR also adds a tokenized_owned() method for use cases where consumers prefer to pay the cost of copying in exchange for owned tokens.
Current State:
This commit does not yet change the tokenizer's behavior—all string allocations remain in place. The goal of the following commits is to replace String with Cow<'a, str> in as many places as possible, leveraging the Borrowed variant to
achieve zero-copy tokenization where feasible.