Hello,
Recently some issues have been opened for big-endian support (i.e. support for big-endian *hosts*), and a couple patches submitted, thanks to Kazuaki Ishizaki. See e.g.: https://issues.apache.org/jira/browse/ARROW-8457 https://issues.apache.org/jira/browse/ARROW-8467 https://issues.apache.org/jira/browse/ARROW-8486 https://issues.apache.org/jira/browse/ARROW-8506 https://issues.apache.org/jira/browse/PARQUET-1845 Achieving big-endian support support accross the C++ Arrow and Parquet codebases is likely to be a very significant effort, potentially requiring cooperation between multiple developers. An additional problem is that, without any Continuous Integration set up, it will be impossible to ensure progress and be notified of regressions. If other people are seriously interested in the desired outcome, they should probably team up with Kazuaki Ishizaki and discuss a practical plan to avoid drowning in the difficulties. Regards Antoine.