Github user wgtmac commented on the issue:
https://github.com/apache/orc/pull/245
As ORC v2 specs may takes a long time to finalize, develop and test with a
non-trivial structural change to be production-ready. We have a very large
amount of data of decimal types in production awaiting this optimization. I'd
propose to optimize the decimal encoding/statistics in 1.5 or probably 1.6. We
can extend RLEv1 to support 128-bit integer with little effort. And replace it
with RLEv3 in ORC 2.0. Will elaborate this in the next patch.
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