rdblue commented on PR #10831:
URL: https://github.com/apache/iceberg/pull/10831#issuecomment-2436457533

   @aihuaxu, I think there are a couple of things missing:
   * The Avro appendix should be updated to state that a Variant is stored as a 
Record with two fields, a required binary `metadata` and a required binary 
`value`. Shredding is not supported in Avro.
   * The ORC appendix should be updated to state that a Variant is stored as a 
struct with two fields, a required binary `metadata` and a required binary 
`value`. Type attribute should be `iceberg.struct-type=variant`. Shredding is 
not supported in ORC.


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