dgvj-work opened a new pull request, #1242:
URL: https://github.com/apache/arrow-go/pull/1242

   ### Rationale for this change
   
   Consensus in apache/parquet-format#591 is that the Variant `value` field is 
mandatory for writers. arrow-go currently omits it when a shredded schema has 
only `metadata` + `typed_value`.
   
   Reading files that already omit `value` should still work.
   
   Fixes #1204
   
   ### What changes are included in this PR?
   
   - `ToParquet` errors if a Variant extension type has no `value` field
   - `FromParquet` still accepts Variant groups without `value`
   
   ### Are these changes tested?
   
   - `go test ./parquet/pqarrow -run 
'TestVariantValueRequiredOnWrite|TestReadVariantWithoutValueField|TestConvertSchemaParquetVariant|TestShreddedVariantSchema'`
   
   ### Are there any user-facing changes?
   
   Yes — writing a Variant schema without a `value` field now returns 
`arrow.ErrInvalid`. Reading such files is unchanged.
   
   
   Made with [Cursor](https://cursor.com)


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