Accept Arrow null (Iceberg v3 unknown) physical types in Parquet schema validation and add test#12
Accept Arrow null (Iceberg v3 unknown) physical types in Parquet schema validation and add test#12manuzhang wants to merge 1 commit into
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Codex Review: Didn't find any major issues. Chef's kiss. ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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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>
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Motivation
unknownvalues as nulls in physical Parquet files, so schema-evolution validation must treat Arrow null physical types as compatible with any projected Iceberg type.Description
ValidateParquetSchemaEvolutioninparquet_schema_util.ccto allow Arrownull(::arrow::Type::NA) physical types and return success for them.ProjectNestedto keep helper functions organized.ValidateParquetSchemaEvolutiondeclaration inparquet_schema_util_internal.hso it is available where needed.ValidateSchemaEvolutionAllowsNullPhysicalTypeinparquet_schema_test.ccthat verifies a Parquet field with::arrow::null()is accepted.Testing
ParquetSchemaProjectionTestsuite including the newValidateSchemaEvolutionAllowsNullPhysicalTypetest, and all tests passed.Codex Task