LLKV Query Expression AST

Work in Progress

A buffer-level, allocator-friendly predicate AST over borrowed byte slices (&[u8]), built for the LLKV toolkit.

This crate intentionally ships without an evaluator or planner.

Expressions can be used with llkv-table for querying.

Currently supports

• Generic field IDs: Expr<'a, F> and Filter<'a, F> work with any F (e.g., u32, &'static str).
• Logical composition: And(Vec<Expr>), Or(Vec<Expr>), Not(Box<Expr>).
• Predicates over bytes:
  • Equality: Equals(&[u8])
  • Ranges with precise bounds: Range { lower: Bound<&[u8]>, upper: Bound<&[u8]> }
  • Comparisons: GreaterThan, GreaterThanOrEquals, LessThan, LessThanOrEquals
  • Sets & patterns: In(&[&[u8]]), StartsWith, EndsWith, Contains
• Ergonomic builders: Expr::all_of, Expr::any_of, Expr::not
• Zero-copy friendly: operands are borrowed; no implicit allocation or decoding is performed here.

License

Licensed under the Apache-2.0 License.