rdblue commented on issue #20826: [Spark-2489][SQL] Unsupported parquet 
datatype optional fixed_len_byte_array
URL: https://github.com/apache/spark/pull/20826#issuecomment-520627192
 
 
   I think it is fine to use BinaryType to read fixed_len_byte_array. That's 
the best mapping, even though the type is technically wider because it includes 
shorter and longer binary sequences. This only allows reading that data, not 
writing values with a fixed length. All writes would use BinaryType regardless.

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