aihuaxu opened a new pull request, #509:
URL: https://github.com/apache/parquet-format/pull/509

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   ### Rationale for this change
   Per Parquet's requirements, we need at least two reference implementations 
to finalize the Variant logical type specification and here are the current 
status:
   
   Java already has the encoding and shredding implementations in place:
   https://github.com/apache/parquet-java/pull/3197
   https://github.com/apache/parquet-java/pull/3202
   https://github.com/apache/parquet-java/issues/3223
   https://github.com/apache/parquet-java/issues/3211
   
   Go also includes encoding and shredding support:
   https://github.com/apache/arrow-go/pull/344
   https://github.com/apache/arrow-go/pull/434
   
   Rust is currently working on the shredding implementation. In addition to 
these, we already have a full Variant implementation in Apache Iceberg, as well 
as in some closed-source engines. At this point, I think we have enough 
implementation coverage to move forward with finalizing the Variant spec.
   
   ### What changes are included in this PR?
   Remove "under active development" notes from the doc.
   
   ### Do these changes have PoC implementations?
   
   
   <!-- Please uncomment the line below and replace ${GITHUB_ISSUE_ID} with the 
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   Closes #508 
   


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