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| <section id="changing-the-apache-arrow-format-specification"> |
| <h1>Changing the Apache Arrow Format Specification<a class="headerlink" href="#changing-the-apache-arrow-format-specification" title="Permalink to this heading">#</a></h1> |
| <p><strong>Cross-language</strong> compatibility is important in Apache Arrow. To |
| maintain it, we use the following process when dealing with changes to |
| the format (files in |
| <a class="github reference external" href="https://github.com/apache/arrow/tree/main/format">apache/arrow</a>):</p> |
| <ul class="simple"> |
| <li><p>We must discuss and vote on the changes on the public mailing list</p></li> |
| <li><p>We must have at least two reference implementations and associated |
| integration tests</p></li> |
| </ul> |
| <p>These do not have to be done in order. In most cases, having at least |
| one draft reference implementation is helpful for design discussion.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>We must update the corresponding documentation (files in |
| <a class="github reference external" href="https://github.com/apache/arrow/tree/main/docs/source/format">apache/arrow</a>) |
| too.</p> |
| </div> |
| <section id="discussion-and-voting-process"> |
| <h2>Discussion and Voting Process<a class="headerlink" href="#discussion-and-voting-process" title="Permalink to this heading">#</a></h2> |
| <p>Changes to the format should be discussed on the public mailing list. |
| Anyone can join the discussion. The discussion should be started by a |
| thread in <a class="reference external" href="mailto:dev%40arrow.apache.org">dev<span>@</span>arrow<span>.</span>apache<span>.</span>org</a> with the <code class="docutils literal notranslate"><span class="pre">[DISCUSS]</span></code> prefixed |
| subject.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>We sometimes use <code class="docutils literal notranslate"><span class="pre">[Discuss]</span></code>, <code class="docutils literal notranslate"><span class="pre">DISCUSS:</span></code> or something similar but |
| <code class="docutils literal notranslate"><span class="pre">[DISCUSS]</span></code> is recommended.</p> |
| </div> |
| <p>Here are some examples:</p> |
| <ul class="simple"> |
| <li><p><a class="reference external" href="https://lists.apache.org/thread/9ynjmjlxm44j2pt443mcr2hmdl7m43yz">[Discuss][Format] Add 32-bit and 64-bit Decimals</a></p></li> |
| <li><p><a class="reference external" href="https://lists.apache.org/thread/dccj1qrozo88qsxx133kcy308qwfwpfm">[DISCUSS][Format] Starting to do some concrete work on the new “StringView” columnar data type</a></p></li> |
| </ul> |
| <p>The voting process is used to verify we have reached consensus. We can |
| start a vote for the format changes after we reach consensus in the |
| preceding DISCUSS mailing list thread. Similar to discussion threads, |
| voting thread must have the subject prefix <code class="docutils literal notranslate"><span class="pre">[VOTE]</span></code>.</p> |
| <p>See also: <a class="reference external" href="https://www.apache.org/foundation/voting.html">Apache Voting Process</a></p> |
| </section> |
| <section id="at-least-two-reference-implementations"> |
| <h2>At Least Two Reference Implementations<a class="headerlink" href="#at-least-two-reference-implementations" title="Permalink to this heading">#</a></h2> |
| <p>We must have at least two reference implementations and associated |
| integration tests to confirm whether the format changes are compatible |
| across languages and consistent.</p> |
| <p>Reference implementations must be within complete Arrow |
| implementations. For example, the C++ library is acceptable but the |
| Python library is not, since it is a wrapper around the C++ |
| library. Here are candidate implementations:</p> |
| <ul class="simple"> |
| <li><p>The C++ implementation</p></li> |
| <li><p>The Java implementation</p></li> |
| <li><p>The Rust (arrow-rs) implementation</p></li> |
| <li><p>The Go implementation</p></li> |
| </ul> |
| <p>We can discuss and vote to add more implementations to the list. We |
| may use <a class="reference internal" href="../status.html"><span class="doc">Implementation Status</span></a> to determine which implementations are |
| complete.</p> |
| </section> |
| <section id="versioning"> |
| <h2>Versioning<a class="headerlink" href="#versioning" title="Permalink to this heading">#</a></h2> |
| <p>The format version (which is separate from the library versions) must |
| also be incremented as new changed are made. See <a class="reference internal" href="Versioning.html"><span class="doc">Format Versioning and Stability</span></a>.</p> |
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