[I] [Java] nullable arrow schema write to parquet error [arrow-java]

[via GitHub]

zhangkre opened a new issue, #89:
URL: https://github.com/apache/arrow-java/issues/89

   ### Describe the usage question you have. Please include as many useful 
details as  possible.
   
   
   When I convert nullable avro schema to nullable arrow schema and write as 
parquet file， meet a exception 
   
   "Unhandled type for Arrow to Parquet schema conversion: sparse_union<bigint: 
int64 not null=5, null: null=0>"
   
   It seems arrow-avro not support SPARE_UNION
   
   how can I use nullable schema in arrow, please help me.
   
   
   ### Component(s)
   
   Java


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