feat: support Iceberg v3 unknown type#662
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Please rebase on the latest main as well. |
Add an Iceberg unknown primitive type and JSON, Arrow, Avro, Parquet, projection, and data path support for null-only unknown fields. Enforce optionality invariants so required projections cannot be materialized from unknown/null-only fields. Co-authored-by: Codex <codex@openai.com>
Enforce unknown as a v3-only optional type in schema validation and update paths, allow schema-update promotion from unknown to primitive types, reject unknown-to-nested projection, and reject unsupported Parquet writes for unknown list or map leaves. Co-authored-by: Codex <codex@openai.com>
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Assert that promotion helpers reject nested type targets for unknown and regular primitive source types. Co-authored-by: Codex <codex@openai.com>
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Closes #665
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Validation
Co-authored-by: @codex