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https://issues.apache.org/jira/browse/ARROW-17938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17612921#comment-17612921
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Antoine Pitrou commented on ARROW-17938:
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Yes, I filed a PR for this: https://github.com/apache/arrow/pull/14321
> [Python][CI] python_test.cc build failure
> -----------------------------------------
>
> Key: ARROW-17938
> URL: https://issues.apache.org/jira/browse/ARROW-17938
> Project: Apache Arrow
> Issue Type: Bug
> Components: Continuous Integration, Python
> Reporter: Antoine Pitrou
> Assignee: Antoine Pitrou
> Priority: Major
>
> Just saw this on Crossbow CI, for example on the
> {{conda-linux-gcc-py39-cuda}} job:
> {code}
> 2022-10-04T12:24:11.3370140Z
> /build/arrow-cpp-ext_1664884270503/work/python/pyarrow/src/python_test.cc:116:5:
> required from here
> 2022-10-04T12:24:11.3372155Z
> /build/arrow-cpp-ext_1664884270503/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pla/include/arrow/util/string_builder.h:49:10:
> error: ambiguous overload for 'operator<<' (operand types are 'std::ostream
> {aka std::basic_ostream<char>}' and 'std::nullptr_t')
> 2022-10-04T12:24:11.3373600Z stream << head;
> 2022-10-04T12:24:11.3374077Z ~~~~~~~^~~~~~~
> {code}
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