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<section id="lifecycle-of-a-pull-request">
<span id="pr-lifecycle"></span><h1>Lifecycle of a pull request<a class="headerlink" href="#lifecycle-of-a-pull-request" title="Permalink to this heading"></a></h1>
<p><a class="reference internal" href="set_up.html#set-up"><span class="std std-ref">As mentioned before</span></a>, the Arrow project uses Git
for version control and a workflow based on pull requests. That
means that you contribute the changes, or “patches”, to the code
by creating a branch in Git, make changes to the code, push the
changes to your <code class="docutils literal notranslate"><span class="pre">origin</span></code> which is your fork of the Arrow
repository on GitHub and then you create a <strong>pull request</strong> against
the official Arrow repository which is saved in your set up as
<code class="docutils literal notranslate"><span class="pre">upstream</span></code>.</p>
<p>You should have Git set up by now, have cloned the repository,
have successfully built Arrow and have a GitHub issue to work on.</p>
<p><strong>Before making changes to the code, you should create a new
branch in Git.</strong></p>
<ol class="arabic">
<li><p>Update your fork’s main branch with <code class="docutils literal notranslate"><span class="pre">upstream/main</span></code>.
Run this in the shell from the <code class="docutils literal notranslate"><span class="pre">arrow</span></code> directory.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>checkout<span class="w"> </span>main<span class="w"> </span><span class="c1"># select the main Arrow branch</span>
<span class="gp">$ </span>git<span class="w"> </span>fetch<span class="w"> </span>upstream<span class="w"> </span><span class="c1"># check for changes in upstream/main</span>
<span class="gp">$ </span>git<span class="w"> </span>pull<span class="w"> </span>--ff-only<span class="w"> </span>upstream<span class="w"> </span>main<span class="w"> </span><span class="c1"># save the changes from upstream/main</span>
</pre></div>
</div>
<p>Note: <code class="docutils literal notranslate"><span class="pre">--ff-only</span></code> applies changes only if they can be fast-forwarded
without conflicts or creating merge commits.</p>
</li>
<li><p>Create a new branch</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>checkout<span class="w"> </span>-b<span class="w"> </span>&lt;branch-name&gt;
</pre></div>
</div>
<p>or (does the same thing)</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>switch<span class="w"> </span>--create<span class="w"> </span>&lt;branch-name&gt;
</pre></div>
</div>
</li>
</ol>
<p>Now you can make changes to the code. To see the changes
made in the library use this two commands:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>status<span class="w"> </span><span class="c1"># to see what files are changed</span>
<span class="gp">$ </span>git<span class="w"> </span>diff<span class="w"> </span><span class="c1"># to see code change per file</span>
</pre></div>
</div>
<section id="creating-a-pull-request">
<span id="create-pr"></span><h2>Creating a pull request<a class="headerlink" href="#creating-a-pull-request" title="Permalink to this heading"></a></h2>
<p>Once you are satisfied with the changes, run the <a class="reference internal" href="testing.html#testing"><span class="std std-ref">tests</span></a>
and <a class="reference internal" href="styling.html#styling"><span class="std std-ref">linters</span></a> and then go ahead and commit the changes.</p>
<ol class="arabic" start="3">
<li><p>Add and commit the changes</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>add<span class="w"> </span>&lt;filenames&gt;
<span class="gp">$ </span>git<span class="w"> </span>commit<span class="w"> </span>-m<span class="w"> </span><span class="s2">&quot;&lt;message&gt;&quot;</span>
</pre></div>
</div>
<p>Alternatively, you can add and commit in one step, if all the files changed
are to be committed (-a to add all, -m for message)</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>commit<span class="w"> </span>-am<span class="w"> </span><span class="s2">&quot;&lt;message&gt;&quot;</span>
</pre></div>
</div>
</li>
<li><p>Then push your work to your Arrow fork</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>origin<span class="w"> </span>&lt;branch-name&gt;
</pre></div>
</div>
</li>
</ol>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Your work is now still under your watchful eye so it’s not a problem
if you see any errors you would like to correct. You can make an
additional commit to correct, and Git has lots of ways to
amend, delete, revise, etc. See <a class="reference external" href="https://git-scm.com/docs">https://git-scm.com/docs</a> for more
information.</p>
<p>Until you make the pull request, nothing is visible on the Arrow
repository and you are free to experiment.</p>
</div>
<p>If all is set, you can make the pull request!</p>
<ol class="arabic" start="5">
<li><p>Go to <code class="docutils literal notranslate"><span class="pre">https://github.com/&lt;your</span> <span class="pre">username&gt;/arrow</span></code> where you will see a box with
the name of the branch that you pushed and next to it a green button
<strong>Compare &amp; pull request</strong>. After clicking on it, you should add a
title and description of the pull request. Underneath you can check
once again the changes you have made.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p>Get more details on naming the pull request in Arrow repository
and other additional information <a class="reference internal" href="../../overview.html#pull-request-and-review"><span class="std std-ref">Pull request and review</span></a>
section.</p>
</div>
</li>
</ol>
<section id="continuous-integration-ci">
<h3>Continuous Integration (CI)<a class="headerlink" href="#continuous-integration-ci" title="Permalink to this heading"></a></h3>
<p>Continuous integration (CI) is an automated way to run tests and
builds on different environments with the changed code made by a
specific pull request. It serves as a stability check before it
gets merged or integrated into the main repository of the project.</p>
<p>Once the pull request is created, the CI will trigger checks on the
code. Depending on what part of the code was changed (documentation,
C++ or other languages for example) the CI is configured to run
the relevant checks.</p>
<p>You will see checks running at the bottom of the pull request page
on GitHub. In case of an error, click on the details and research the cause
of the failing build.</p>
<figure class="align-default" id="id1">
<a class="reference internal image-reference" href="../../../_images/ci_process_docs.jpeg"><img alt="CI window showing the status of the code checks in case of changes made to the documentation." src="../../../_images/ci_process_docs.jpeg" style="width: 625.8px; height: 244.79999999999998px;" /></a>
<figcaption>
<p><span class="caption-text">CI checks for changes made to the documentation.</span><a class="headerlink" href="#id1" title="Permalink to this image"></a></p>
</figcaption>
</figure>
<figure class="align-default" id="id2">
<a class="reference internal image-reference" href="../../../_images/ci_process_python.jpeg"><img alt="CI window showing the status of the code checks in case of changes made to the python files" src="../../../_images/ci_process_python.jpeg" style="width: 604.9399999999999px; height: 321.9px;" /></a>
<figcaption>
<p><span class="caption-text">CI checks for changes made to the python files.</span><a class="headerlink" href="#id2" title="Permalink to this image"></a></p>
</figcaption>
</figure>
<figure class="align-default" id="id3">
<a class="reference internal image-reference" href="../../../_images/ci_process_r.jpeg"><img alt="CI window showing the status of the code checks in case of changes made to the R files." src="../../../_images/ci_process_r.jpeg" style="width: 607.8399999999999px; height: 252.29999999999998px;" /></a>
<figcaption>
<p><span class="caption-text">CI checks for changes made to the R files.</span><a class="headerlink" href="#id3" title="Permalink to this image"></a></p>
</figcaption>
</figure>
<p>Besides the CI jobs that check the changes in GitHub repository
(opening or merging of a pull request) we also use CI for nightly
builds and releases of the Apache Arrow library.</p>
<p>Also, extended triggering jobs can be used in your pull request for
example adding a comment with <code class="docutils literal notranslate"><span class="pre">&#64;github-actions</span> <span class="pre">crossbow</span> <span class="pre">submit</span> <span class="pre">python</span></code>
will run PyArrow tests via GitHub actions. These are mostly used to run
tests on environments that are less common and are normally
not needed in first time contributions.</p>
<p>To read more about this topic visit <a class="reference internal" href="../../continuous_integration/overview.html#continuous-integration"><span class="std std-ref">Continuous Integration</span></a>.</p>
</section>
</section>
<section id="reviews-and-merge-of-the-pull-request">
<h2>Reviews and merge of the pull request<a class="headerlink" href="#reviews-and-merge-of-the-pull-request" title="Permalink to this heading"></a></h2>
<p>When the pull request is submitted it waits to get reviewed. One of
great things about open source is that your work can get lots of feedback and
so it gets perfected. Do not be discouraged by the time it takes for
the PR to get merged due to reviews and corrections. It is a process
that supports quality and with it you can learn a lot.</p>
<p>If it still takes too long to get merged, do not hesitate to remind
maintainers in the comment section of the pull request and post
reminders on the GitHub issue also.</p>
<section id="how-to-get-your-pull-request-to-be-reviewed">
<h3>How to get your pull request to be reviewed?<a class="headerlink" href="#how-to-get-your-pull-request-to-be-reviewed" title="Permalink to this heading"></a></h3>
<p>Arrow maintainers will be notified when a pull request is created and
they will get to it as soon as possible. If days pass and it still had
not been reviewed go ahead and mention the reporter of the GitHub issue
or a developer that you communicated with via mailing list or GitHub.</p>
<p>To put a <strong>mention</strong> in GitHub insert &#64; in the comment and select the
username from the list.</p>
</section>
<section id="commenting-on-a-pull-request">
<h3>Commenting on a pull request<a class="headerlink" href="#commenting-on-a-pull-request" title="Permalink to this heading"></a></h3>
<p>When a pull request is open in the repository you and other developers
can comment on the proposed solution.</p>
<p>To create a general comment navigate to the <strong>Conversation</strong> tab of
your pull request and start writing in the comment box at the bottom of
the page.</p>
<p>You can also comment on a section of the file to point out something
specific from your code. To do this navigate to <strong>Files changed</strong> tab and
select a line you want to insert the comment to. Hovering over the beginning
of the line you will see a <strong>blue plus icon</strong>. You can click on it or drag
it to select multiple lines and then click the icon to insert the comment.</p>
</section>
<section id="resolve-conversation">
<h3>Resolve conversation<a class="headerlink" href="#resolve-conversation" title="Permalink to this heading"></a></h3>
<p>You can resolve a conversion in a pull request review by clicking
<strong>Resolve conversation</strong> in the <strong>Files changed</strong> tab. This way the
conversation will be collapsed and marked as resolved which will make it
easier for you to organize what is done and what still needs to be addressed.</p>
</section>
<section id="updating-your-pull-request">
<h3>Updating your pull request<a class="headerlink" href="#updating-your-pull-request" title="Permalink to this heading"></a></h3>
<p>The procedure after getting reviews is similar to creating the initial pull request.
You need to update your code locally, make a commit, update the branch to sync
it with upstream and push your code to origin. It will automatically be updated
in your pull request as well.</p>
<p>The steps for updating the pull request would then be as follows:</p>
<ol class="arabic">
<li><p>Updating the code locally and making a commit as before:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>commit<span class="w"> </span>-am<span class="w"> </span><span class="s2">&quot;&lt;message&gt;&quot;</span><span class="w"> </span><span class="c1">#if all changed files are to be committed</span>
</pre></div>
</div>
</li>
<li><p><strong>Important!</strong> In case there are commits from other developers on the pull
request branch or if you committed suggestions from the GitHub you need
to update you code with <code class="docutils literal notranslate"><span class="pre">origin</span></code> before rebasing! To do this run:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>pull<span class="w"> </span>origin<span class="w"> </span>&lt;branch-name&gt;
</pre></div>
</div>
<p>Here we merge the new commits with our local branch and we do not rebase.</p>
</li>
<li><p>Now we have to update the branch to sync with upstream main Arrow branch.
This way the pull request will be able to get merged. We use rebase in this
case.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git<span class="w"> </span>pull<span class="w"> </span>upstream<span class="w"> </span>main<span class="w"> </span>--rebase
</pre></div>
</div>
<p>This will rebase your local commits on top of the tip of <code class="docutils literal notranslate"><span class="pre">upstream/main</span></code>.</p>
</li>
<li><p>Now you can push the changes by running:</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>origin<span class="w"> </span>&lt;branch-name&gt;<span class="w"> </span>--force
</pre></div>
</div>
<p><em>Note about force pushing to a branch that is being reviewed:</em> if you want
reviewers to look at your updates, please ensure you comment on the PR on
GitHub as simply force pushing does not trigger a notification in the
GitHub user interface.</p>
</li>
</ol>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p>See more about updating the branch (we use <code class="docutils literal notranslate"><span class="pre">rebase</span></code>, not <code class="docutils literal notranslate"><span class="pre">merge</span></code>)
and squashing local commits in <a class="reference internal" href="../../overview.html#git-conventions"><span class="std std-ref">Local git conventions</span></a>.</p>
</div>
<p>If the review process is successful your pull request will get merged.</p>
</section>
</section>
<section id="congratulations">
<h2>Congratulations! 🎉<a class="headerlink" href="#congratulations" title="Permalink to this heading"></a></h2>
</section>
</section>
</div>
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