Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9040#issuecomment-146974600
@davies I am doing benchmark for this one. At first I was hoping to see
noticeable performance gain for binary backed decimals, but later I found that
`PARQUET_1_0` simply doesn't support dictionary encoding for
`FIXED_LEN_BYTE_ARRAY`. So I think only binary decimals written in
`PARQUET_2_0` formats benefit significantly from this one, since it avoids both
`Decimal` instantiation and decoding the binary values.
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