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| <section id="contributing-overview"> |
| <span id="contrib-overview"></span><h1>Contributing Overview<a class="headerlink" href="#contributing-overview" title="Permalink to this heading">#</a></h1> |
| <section id="local-git-conventions"> |
| <span id="git-conventions"></span><h2>Local git conventions<a class="headerlink" href="#local-git-conventions" title="Permalink to this heading">#</a></h2> |
| <p>If you are tracking the Arrow source repository locally, here is a |
| checklist for using <code class="docutils literal notranslate"><span class="pre">git</span></code>:</p> |
| <ul> |
| <li><p>Work off of your <strong>personal fork</strong> of <code class="docutils literal notranslate"><span class="pre">apache/arrow</span></code> and submit pull requests |
| “upstream”.</p></li> |
| <li><p>Keep your fork’s <strong>main branch synced</strong> with <code class="docutils literal notranslate"><span class="pre">upstream/main</span></code>.</p></li> |
| <li><p><strong>Develop on branches</strong>, rather than your own “main” branch.</p></li> |
| <li><p>It does not matter what you call your branch. Some people like to use the GitHub |
| issue number as branch name, others use descriptive names.</p></li> |
| <li><p><strong>Sync your branch</strong> with <code class="docutils literal notranslate"><span class="pre">upstream/main</span></code> <strong>regularly</strong>, as many commits are |
| merged to main every day.</p></li> |
| <li><p>It is recommended to use <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">rebase</span></code> rather than <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">merge</span></code>.</p></li> |
| <li><p>In case there are conflicts, and your local commit history has multiple commits, |
| you may simplify the conflict resolution process by <strong>squashing your local commits |
| into a single commit</strong>. Preserving the commit history isn’t as important because |
| when your feature branch is merged upstream, a squash happens automatically.</p> |
| <details class="sd-sphinx-override sd-dropdown sd-card sd-mb-3 sd-shadow-none sd-fade-in-slide-down"> |
| <summary class="sd-summary-title sd-card-header"> |
| How to squash local commits?<div class="sd-summary-down docutils"> |
| <svg version="1.1" width="1.5em" height="1.5em" class="sd-octicon sd-octicon-chevron-down" viewBox="0 0 24 24" aria-hidden="true"><path fill-rule="evenodd" d="M5.22 8.72a.75.75 0 000 1.06l6.25 6.25a.75.75 0 001.06 0l6.25-6.25a.75.75 0 00-1.06-1.06L12 14.44 6.28 8.72a.75.75 0 00-1.06 0z"></path></svg></div> |
| <div class="sd-summary-up docutils"> |
| <svg version="1.1" width="1.5em" height="1.5em" class="sd-octicon sd-octicon-chevron-up" viewBox="0 0 24 24" aria-hidden="true"><path fill-rule="evenodd" d="M18.78 15.28a.75.75 0 000-1.06l-6.25-6.25a.75.75 0 00-1.06 0l-6.25 6.25a.75.75 0 101.06 1.06L12 9.56l5.72 5.72a.75.75 0 001.06 0z"></path></svg></div> |
| </summary><div class="sd-summary-content sd-card-body docutils"> |
| <p class="sd-card-text">Abort the rebase with:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>rebase<span class="w"> </span>--abort |
| </pre></div> |
| </div> |
| <p class="sd-card-text">Following which, the local commits can be squashed interactively by running:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>rebase<span class="w"> </span>--interactive<span class="w"> </span>ORIG_HEAD~n |
| </pre></div> |
| </div> |
| <p class="sd-card-text">Where <code class="docutils literal notranslate"><span class="pre">n</span></code> is the number of commits you have in your local branch. After the squash, |
| you can try the merge again, and this time conflict resolution should be relatively |
| straightforward.</p> |
| <p class="sd-card-text">Once you have an updated local copy, you can push to your remote repo. Note, since your |
| remote repo still holds the old history, you would need to do a force push. Most pushes |
| should use <code class="docutils literal notranslate"><span class="pre">--force-with-lease</span></code>:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>push<span class="w"> </span>--force-with-lease<span class="w"> </span>origin<span class="w"> </span>branch |
| </pre></div> |
| </div> |
| <p class="sd-card-text">The option <code class="docutils literal notranslate"><span class="pre">--force-with-lease</span></code> will fail if the remote has commits that are not available |
| locally, for example if additional commits have been made by a colleague. By using |
| <code class="docutils literal notranslate"><span class="pre">--force-with-lease</span></code> instead of <code class="docutils literal notranslate"><span class="pre">--force</span></code>, you ensure those commits are not overwritten |
| and can fetch those changes if desired.</p> |
| </div> |
| </details><details class="sd-sphinx-override sd-dropdown sd-card sd-mb-3 sd-shadow-none sd-fade-in-slide-down"> |
| <summary class="sd-summary-title sd-card-header"> |
| Setting rebase to be default<div class="sd-summary-down docutils"> |
| <svg version="1.1" width="1.5em" height="1.5em" class="sd-octicon sd-octicon-chevron-down" viewBox="0 0 24 24" aria-hidden="true"><path fill-rule="evenodd" d="M5.22 8.72a.75.75 0 000 1.06l6.25 6.25a.75.75 0 001.06 0l6.25-6.25a.75.75 0 00-1.06-1.06L12 14.44 6.28 8.72a.75.75 0 00-1.06 0z"></path></svg></div> |
| <div class="sd-summary-up docutils"> |
| <svg version="1.1" width="1.5em" height="1.5em" class="sd-octicon sd-octicon-chevron-up" viewBox="0 0 24 24" aria-hidden="true"><path fill-rule="evenodd" d="M18.78 15.28a.75.75 0 000-1.06l-6.25-6.25a.75.75 0 00-1.06 0l-6.25 6.25a.75.75 0 101.06 1.06L12 9.56l5.72 5.72a.75.75 0 001.06 0z"></path></svg></div> |
| </summary><div class="sd-summary-content sd-card-body docutils"> |
| <p class="sd-card-text">If you set the following in your repo’s <code class="docutils literal notranslate"><span class="pre">.git/config</span></code>, the <code class="docutils literal notranslate"><span class="pre">--rebase</span></code> option can be |
| omitted from the <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">pull</span></code> command, as it is implied by default.</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">[pull]</span> |
| <span class="go"> rebase = true</span> |
| </pre></div> |
| </div> |
| </div> |
| </details></li> |
| </ul> |
| </section> |
| <section id="pull-request-and-review"> |
| <span id="id1"></span><h2>Pull request and review<a class="headerlink" href="#pull-request-and-review" title="Permalink to this heading">#</a></h2> |
| <p>When contributing a patch, use this list as a checklist of Apache Arrow workflow:</p> |
| <ul class="simple"> |
| <li><p>Submit the patch as a <strong>GitHub pull request</strong> against the <strong>main branch</strong>.</p></li> |
| <li><p>So that your pull request syncs with the GitHub issue, <strong>prefix your pull request |
| title with the GitHub issue id</strong> (ex: |
| <a class="reference external" href="https://github.com/apache/arrow/pull/14867">GH-14866: [C++] Remove internal GroupBy implementation</a>). |
| Similarly <strong>prefix your pull request name with the JIRA issue id</strong> (ex: |
| <a class="reference external" href="https://github.com/apache/arrow/pull/4225">ARROW-767: [C++] Filesystem abstraction</a>) |
| in case the issue is still located in Jira.</p></li> |
| <li><p>Give the pull request a <strong>clear, brief description</strong>: when the pull request is |
| merged, this will be retained in the extended commit message.</p></li> |
| <li><p>Make sure that your code <strong>passes the unit tests</strong>. You can find instructions how |
| to run the unit tests for each Arrow component in its respective README file.</p></li> |
| </ul> |
| <p>Core developers and others with a stake in the part of the project your change |
| affects will review, request changes, and hopefully indicate their approval |
| in the end. To make the review process smooth for everyone, try to</p> |
| <ul> |
| <li><p><strong>Break your work into small, single-purpose patches if possible.</strong></p> |
| <p>It’s much harder to merge in a large change with a lot of disjoint features, |
| and particularly if you’re new to the project, smaller changes are much easier |
| for maintainers to accept.</p> |
| </li> |
| <li><p><strong>Add new unit tests for your code.</strong></p></li> |
| <li><p><strong>Follow the style guides</strong> for the part(s) of the project you’re modifying.</p> |
| <p>Some languages (C++ and Python, for example) run a lint check in |
| continuous integration. For all languages, see their respective developer |
| documentation and READMEs for style guidance.</p> |
| </li> |
| <li><p>Try to make it look as if the codebase has a single author, |
| and emulate any conventions you see, whether or not they are officially |
| documented or checked.</p></li> |
| </ul> |
| <p>When tests are passing and the pull request has been approved by the interested |
| parties, a <a class="reference external" href="https://arrow.apache.org/committers/">committer</a> |
| will merge the pull request. This is done with a |
| <strong>command-line utility that does a squash merge</strong>.</p> |
| <details class="sd-sphinx-override sd-dropdown sd-card sd-mb-3 sd-shadow-none sd-fade-in-slide-down"> |
| <summary class="sd-summary-title sd-card-header"> |
| Details on squash merge<div class="sd-summary-down docutils"> |
| <svg version="1.1" width="1.5em" height="1.5em" class="sd-octicon sd-octicon-chevron-down" viewBox="0 0 24 24" aria-hidden="true"><path fill-rule="evenodd" d="M5.22 8.72a.75.75 0 000 1.06l6.25 6.25a.75.75 0 001.06 0l6.25-6.25a.75.75 0 00-1.06-1.06L12 14.44 6.28 8.72a.75.75 0 00-1.06 0z"></path></svg></div> |
| <div class="sd-summary-up docutils"> |
| <svg version="1.1" width="1.5em" height="1.5em" class="sd-octicon sd-octicon-chevron-up" viewBox="0 0 24 24" aria-hidden="true"><path fill-rule="evenodd" d="M18.78 15.28a.75.75 0 000-1.06l-6.25-6.25a.75.75 0 00-1.06 0l-6.25 6.25a.75.75 0 101.06 1.06L12 9.56l5.72 5.72a.75.75 0 001.06 0z"></path></svg></div> |
| </summary><div class="sd-summary-content sd-card-body docutils"> |
| <p class="sd-card-text">A pull request is merged with a squash merge so that all of your commits will be |
| registered as a single commit to the main branch; this simplifies the |
| connection between GitHub issues and commits, makes it easier to bisect |
| history to identify where changes were introduced, and helps us be able to |
| cherry-pick individual patches onto a maintenance branch.</p> |
| <p class="sd-card-text">Your pull request will appear in the GitHub interface to have been “merged”. |
| In the commit message of that commit, the merge tool adds the pull request |
| description, a link back to the pull request, and attribution to the contributor |
| and any co-authors.</p> |
| </div> |
| </details></section> |
| <section id="experimental-repositories"> |
| <h2>Experimental repositories<a class="headerlink" href="#experimental-repositories" title="Permalink to this heading">#</a></h2> |
| <p>Apache Arrow has an explicit policy over developing experimental repositories |
| in the context of |
| <a class="reference external" href="https://grep.codeconsult.ch/2020/04/07/rules-for-revolutionaries-2000-edition/">rules for revolutionaries</a>.</p> |
| <p>The main motivation for this policy is to offer a lightweight mechanism to |
| conduct experimental work, with the necessary creative freedom, within the ASF |
| and the Apache Arrow governance model. This policy allows committers to work on |
| new repositories, as they offer many important tools to manage it (e.g. github |
| issues, “watch”, “github stars” to measure overall interest).</p> |
| <section id="process"> |
| <h3>Process<a class="headerlink" href="#process" title="Permalink to this heading">#</a></h3> |
| <ul class="simple"> |
| <li><p>A committer <em>may</em> initiate experimental work by creating a separate git |
| repository within the Apache Arrow (e.g. via <a class="reference external" href="https://selfserve.apache.org/">selfserve</a>) |
| and announcing it on the mailing list, together with its goals, and a link to the |
| newly created repository.</p></li> |
| <li><p>The committer <em>must</em> initiate an email thread with the sole purpose of |
| presenting updates to the community about the status of the repo.</p></li> |
| <li><p>There <em>must not</em> be official releases from the repository.</p></li> |
| <li><p>Any decision to make the experimental repo official in any way, whether by merging or migrating, <em>must</em> be discussed and voted on in the mailing list.</p></li> |
| <li><p>The committer is responsible for managing issues, documentation, CI of the repository, |
| including licensing checks.</p></li> |
| <li><p>The committer decides when the repository is archived.</p></li> |
| </ul> |
| </section> |
| <section id="repository-management"> |
| <h3>Repository management<a class="headerlink" href="#repository-management" title="Permalink to this heading">#</a></h3> |
| <ul class="simple"> |
| <li><p>The repository <em>must</em> be under <code class="docutils literal notranslate"><span class="pre">apache/</span></code></p></li> |
| <li><p>The repository’s name <em>must</em> be prefixed by <code class="docutils literal notranslate"><span class="pre">arrow-experimental-</span></code></p></li> |
| <li><p>The committer has full permissions over the repository (within possible in ASF)</p></li> |
| <li><p>Push / merge permissions <em>must only</em> be granted to Apache Arrow committers</p></li> |
| </ul> |
| </section> |
| <section id="development-process"> |
| <h3>Development process<a class="headerlink" href="#development-process" title="Permalink to this heading">#</a></h3> |
| <ul class="simple"> |
| <li><p>The repository must follow the ASF requirements about 3rd party code.</p></li> |
| <li><p>The committer decides how to manage issues, PRs, etc.</p></li> |
| </ul> |
| </section> |
| <section id="divergences"> |
| <h3>Divergences<a class="headerlink" href="#divergences" title="Permalink to this heading">#</a></h3> |
| <ul class="simple"> |
| <li><p>If any of the “must” above fails to materialize and no correction measure |
| is taken by the committer upon request, the PMC <em>should</em> take ownership |
| and decide what to do.</p></li> |
| </ul> |
| </section> |
| </section> |
| <section id="guidance-for-specific-features"> |
| <span id="specific-features"></span><h2>Guidance for specific features<a class="headerlink" href="#guidance-for-specific-features" title="Permalink to this heading">#</a></h2> |
| <p>From time to time the community has discussions on specific types of features |
| and improvements that they expect to support. This section outlines decisions |
| that have been made in this regard.</p> |
| <section id="endianness"> |
| <h3>Endianness<a class="headerlink" href="#endianness" title="Permalink to this heading">#</a></h3> |
| <p>The Arrow format allows setting endianness. Due to the popularity of |
| little endian architectures most of implementation assume little endian by |
| default. There has been some effort to support big endian platforms as well. |
| Based on a <a class="reference external" href="https://mail-archives.apache.org/mod_mbox/arrow-dev/202009.mbox/%3cCAK7Z5T--HHhr9Dy43PYhD6m-XoU4qoGwQVLwZsG-kOxXjPTyZA@mail.gmail.com%3e">mailing-list discussion</a>, |
| the requirements for a new platform are:</p> |
| <ol class="arabic simple"> |
| <li><p>A robust (non-flaky, returning results in a reasonable time) Continuous |
| Integration setup.</p></li> |
| <li><p>Benchmarks for performance critical parts of the code to demonstrate |
| no regression.</p></li> |
| </ol> |
| <p>Furthermore, for big-endian support, there are two levels that an |
| implementation can support:</p> |
| <ol class="arabic simple"> |
| <li><p>Native endianness (all Arrow communication happens with processes of the |
| same endianness). This includes ancillary functionality such as reading |
| and writing various file formats, such as Parquet.</p></li> |
| <li><p>Cross endian support (implementations will do byte reordering when |
| appropriate for <a class="reference internal" href="../format/Columnar.html#format-ipc"><span class="std std-ref">IPC</span></a> and <a class="reference internal" href="../format/Flight.html#flight-rpc"><span class="std std-ref">Flight</span></a> |
| messages).</p></li> |
| </ol> |
| <p>The decision on what level to support is based on maintainers’ preferences for |
| complexity and technical risk. In general all implementations should be open |
| to native endianness support (provided the CI and performance requirements |
| are met). Cross endianness support is a question for individual maintainers.</p> |
| <p>The current implementations aiming for cross endian support are:</p> |
| <ol class="arabic simple"> |
| <li><p>C++</p></li> |
| </ol> |
| <p>Implementations that do not intend to implement cross endian support:</p> |
| <ol class="arabic simple"> |
| <li><p>Java</p></li> |
| </ol> |
| <p>For other libraries, a discussion to gather consensus on the mailing-list |
| should be had before submitting PRs.</p> |
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