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[Java] nullable arrow schema write to parquet error #89

@zhangkre

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@zhangkre

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.

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