feat: support Iceberg v3 unknown type#662
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wgtmac
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May 22, 2026
wgtmac
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wgtmac
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Please rebase on the latest main as well. |
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Could you please rebase to resolve conflicts? PR for v3 nano precision timestamp types has been merged. |
zhjwpku
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| constexpr std::string_view json = | ||
| R"({"fields":[{"id":1,"name":"mysteries","required":false,"type":{"key":"unknown","key-id":2,"type":"map","value":"string","value-id":3,"value-required":false}}],"schema-id":1,"type":"struct"})"; | ||
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| auto schema_result = SchemaFromJson(nlohmann::json::parse(json)); |
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From the spec: Map keys are required and map values can be either optional or required. So I'm wondering should we report something like Map 'key' can not be unknown type rather than the current error msg?
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@manuzhang Do you have time to revive this? |
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@wgtmac Yes, I'm on a trip this week and will update a bit later. |
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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> test: cover forbidden nested type promotions 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