Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/21582
@gatorsmile . [ORC-386](https://github.com/apache/orc/pull/290) is not
merged yet, but I've got the following from Hive's `DecimalBench`. For Spark
side, we can proceed after this BUILD PR.
```
Benchmark (version) Mode Cnt Score Error
Units
DecimalBench.read ORIGINAL avgt 5 10375991.566 ± 99751.161
us/op
DecimalBench.read USE_DECIMAL64 avgt 5 7368917.561 ± 39257.332
us/op
DecimalBench.write ORIGINAL avgt 5 211008.673 ± 30220.403
us/op
DecimalBench.write USE_DECIMAL64 avgt 5 33881.693 ± 216.601
us/op
```
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