Yibo Cai created ARROW-13439:
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Summary: [C++] Unify BasicDecimal128 and BasicDecimal256 classes
Key: ARROW-13439
URL: https://issues.apache.org/jira/browse/ARROW-13439
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Yibo Cai
BasicDecimal128 uses two dedicated int64 (higher, lower) to store the value.
It's possible to use std::array<uint64, 2> to store the value, just like
BasicDecimal256 does, and to unify the two classes.
As decimal operations are quite expensive, guess this indirection won't cause
performance loss.
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