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https://issues.apache.org/jira/browse/ARROW-584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884385#comment-15884385
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Wes McKinney commented on ARROW-584:
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I should add that building with {{-m32}} on Linux exposes many additional
warnings on platforms where {{sizeof(int)}} is 4 (like Win32)
> [C++] Fix compiler warnings exposed with -Wconversion
> -----------------------------------------------------
>
> Key: ARROW-584
> URL: https://issues.apache.org/jira/browse/ARROW-584
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
>
> We have a number of imprecise or implicit integer conversions -- it would be
> good to address all of these warnings, and additionally to build with
> {{-Wconversion}} in Travis CI so we keep the build clean going forward.
> Some of these warnings may so away as part of ARROW-493 but there are many
> others.
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