mapleFU commented on issue #46555:
URL: https://github.com/apache/arrow/issues/46555#issuecomment-2905035400

   Yeah:
   1. for array and object, size is unknown before `finishObject`
   2. For element in array and object, an "arena" like object is likely used
   
   I found the parquet-java uses nested impl [1], and velocypack uses internal 
arena stack [2]. [1] is more easy to implement, [2] is more efficient for me
   
   [1] 
https://github.com/apache/parquet-java/blob/1f1e07bbf750fba228851c2d63470c3da5726831/parquet-variant/src/main/java/org/apache/parquet/variant/VariantBuilder.java#L437
   [2] 
https://github.com/arangodb/velocypack/blob/8f0fc652e7641046a9f12b7d8a9917dcc507a5c2/include/velocypack/Builder.h#L98-L99
   


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