mofeiatwork opened a new issue #12459:
URL: https://github.com/apache/arrow/issues/12459


   I'm working on a project that convert parquet to JSON format through apache 
arrow, but got confused about it.
   
   One intuitive way is to iterate several types of `Array` directly, and 
construct a JSON object from it. For `PrimitiveArray` it's easy, but seems very 
hard for `NestArray`, since it does not provide any `Iterator` interface to get 
an `Struct`, `List`, `Map`, but only the underlying stored array. 
   
   I have investigate the examples and documents to solve this problem but got 
no result.
   
   To conclude, is there interface to iterate nested structure in row-oriented 
style, instead of operate on the underlying array? Or existed interface to 
convert arrow array to JSON format?
   
   Thanks!


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