feat(python): Python binding for iceberg-rust Schema#3
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May 24, 2026 16:45
Add serde_json dep (needed for from_json/to_json in schema.rs) and register the schema submodule in lib.rs alongside the existing modules.
Parse once via Schema.from_json(); Arc<Schema> shared across callers. Exposes schema_id, highest_field_id, column_names, identifier_field_ids, find_field_by_name, field_by_id, to_json, to_arrow_schema, __arrow_c_schema__ (Arrow PyCapsule Interface), and _capsule (Rust→Rust handoff via PyCapsule named "iceberg_core_schema").
Covers all public methods with full docstrings, including the __arrow_c_schema__ PyCapsule dunder and the _capsule() Rust handoff.
Covers construction (V1/V2 JSON, error cases), all getter methods, case-sensitive field lookup, to_json round-trips, PyCapsule lifecycle, __arrow_c_schema__ PyCapsule Interface, and to_arrow_schema with PARQUET:field_id preservation.
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Status:
Deferred fork-only draft.
Summary:
Adds a Python binding for iceberg-rust Schema as an opaque pyiceberg_core schema handle constructed from Iceberg schema JSON.
Scope:
Runtime binding only. Typing stubs are handled separately.
No external issue references.