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https://issues.apache.org/jira/browse/ARROW-3676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16854415#comment-16854415
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Sebastien Binet commented on ARROW-3676:
----------------------------------------

one possible package to leverage and implement this (w/o reaching for, say, 
`math/big.Int`) could be: [https://github.com/lukechampine/uint128]

or just piggyback on what was implemented in C++:

- 
[https://github.com/apache/arrow/blob/master/cpp/src/arrow/util/basic_decimal.h]

> [Go] implement Decimal128 array
> -------------------------------
>
>                 Key: ARROW-3676
>                 URL: https://issues.apache.org/jira/browse/ARROW-3676
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Go
>            Reporter: Sebastien Binet
>            Priority: Major
>




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