WaterKnight1998 opened a new issue, #3774:
URL: https://github.com/apache/arrow-rs/issues/3774

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   
   I am trying to convert Parquet data written using Avro Parquet Writer of 
Java. This parquet includes the Avro Schema inside the key 
`parquet.avro.schema` of the metadata, I want to convert this parquet data back 
to Avro using this schema and programmed in Rust.
   
   I have tried to solve this challenge by converting Parquet into a json with 
string `arrow_json::LineDelimitedWriter` and then read this data with 
`serde_json` and serialise to Avro. In Avro Serializer I need that nullable 
fields are provided as `Option<T>`. The problem is that when I write the data 
into JSON null fields are skipped and I can't recover them as Options with 
`serde_json`
   
   **Describe the solution you'd like**
   
   I would like that `arrow_json` has a parameter for specifying if you want to 
output the null field.
   
   


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