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| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.sqrt.html">pyarrow.compute.sqrt</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.bit_wise_or.html">pyarrow.compute.bit_wise_or</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.bit_wise_xor.html">pyarrow.compute.bit_wise_xor</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.ceil.html">pyarrow.compute.ceil</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.floor.html">pyarrow.compute.floor</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.round_to_multiple.html">pyarrow.compute.round_to_multiple</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.trunc.html">pyarrow.compute.trunc</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.ln.html">pyarrow.compute.ln</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.ln_checked.html">pyarrow.compute.ln_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.log10.html">pyarrow.compute.log10</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.log10_checked.html">pyarrow.compute.log10_checked</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.log2.html">pyarrow.compute.log2</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.log2_checked.html">pyarrow.compute.log2_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.logb.html">pyarrow.compute.logb</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.logb_checked.html">pyarrow.compute.logb_checked</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.acos_checked.html">pyarrow.compute.acos_checked</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.asin_checked.html">pyarrow.compute.asin_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.atan.html">pyarrow.compute.atan</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.atan2.html">pyarrow.compute.atan2</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.cos.html">pyarrow.compute.cos</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.cos_checked.html">pyarrow.compute.cos_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.sin.html">pyarrow.compute.sin</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.sin_checked.html">pyarrow.compute.sin_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.tan.html">pyarrow.compute.tan</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.tan_checked.html">pyarrow.compute.tan_checked</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../generated/pyarrow.compute.equal.html">pyarrow.compute.equal</a></li> |
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| <section id="integrating-pyarrow-with-r"> |
| <h1>Integrating PyArrow with R<a class="headerlink" href="#integrating-pyarrow-with-r" title="Permalink to this heading">#</a></h1> |
| <p>Arrow supports exchanging data within the same process through the |
| <a class="reference internal" href="../../format/CDataInterface.html#c-data-interface"><span class="std std-ref">The Arrow C data interface</span></a>.</p> |
| <p>This can be used to exchange data between Python and R functions and |
| methods so that the two languages can interact without any cost of |
| marshaling and unmarshaling data.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>The article takes for granted that you have a <code class="docutils literal notranslate"><span class="pre">Python</span></code> environment |
| with <code class="docutils literal notranslate"><span class="pre">pyarrow</span></code> correctly installed and an <code class="docutils literal notranslate"><span class="pre">R</span></code> environment with |
| <code class="docutils literal notranslate"><span class="pre">arrow</span></code> library correctly installed. |
| See <a class="reference external" href="https://arrow.apache.org/docs/python/install.html">Python Install Instructions</a> |
| and <a class="reference external" href="https://arrow.apache.org/docs/r/#installation">R Install instructions</a> |
| for further details.</p> |
| </div> |
| <section id="invoking-r-functions-from-python"> |
| <h2>Invoking R functions from Python<a class="headerlink" href="#invoking-r-functions-from-python" title="Permalink to this heading">#</a></h2> |
| <p>Suppose we have a simple R function receiving an Arrow Array to |
| add <code class="docutils literal notranslate"><span class="pre">3</span></code> to all its elements:</p> |
| <div class="highlight-R notranslate"><div class="highlight"><pre><span></span><span class="nf">library</span><span class="p">(</span><span class="n">arrow</span><span class="p">)</span> |
| |
| <span class="n">addthree</span><span class="w"> </span><span class="o"><-</span><span class="w"> </span><span class="nf">function</span><span class="p">(</span><span class="n">arr</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="nf">return</span><span class="p">(</span><span class="n">arr</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="m">3L</span><span class="p">)</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>We could save such a function in a <code class="docutils literal notranslate"><span class="pre">addthree.R</span></code> file so that we can |
| make it available for reuse.</p> |
| <p>Once the <code class="docutils literal notranslate"><span class="pre">addthree.R</span></code> file is created we can invoke any of its functions |
| from Python using the |
| <a class="reference external" href="https://rpy2.github.io/doc/latest/html/index.html">rpy2</a> library which |
| enables a R runtime within the Python interpreter.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">rpy2</span></code> can be installed using <code class="docutils literal notranslate"><span class="pre">pip</span></code> like most Python libraries</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>pip<span class="w"> </span>install<span class="w"> </span>rpy2 |
| </pre></div> |
| </div> |
| <p>The most basic thing we can do with our <code class="docutils literal notranslate"><span class="pre">addthree</span></code> function is to |
| invoke it from Python with a number and see how it will return the result.</p> |
| <p>To do so we can create an <code class="docutils literal notranslate"><span class="pre">addthree.py</span></code> file which uses <code class="docutils literal notranslate"><span class="pre">rpy2</span></code> to |
| import the <code class="docutils literal notranslate"><span class="pre">addthree</span></code> function from <code class="docutils literal notranslate"><span class="pre">addthree.R</span></code> file and invoke it:</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">rpy2.robjects</span> <span class="k">as</span> <span class="nn">robjects</span> |
| |
| <span class="c1"># Load the addthree.R file</span> |
| <span class="n">r_source</span> <span class="o">=</span> <span class="n">robjects</span><span class="o">.</span><span class="n">r</span><span class="p">[</span><span class="s2">"source"</span><span class="p">]</span> |
| <span class="n">r_source</span><span class="p">(</span><span class="s2">"addthree.R"</span><span class="p">)</span> |
| |
| <span class="c1"># Get a reference to the addthree function</span> |
| <span class="n">addthree</span> <span class="o">=</span> <span class="n">robjects</span><span class="o">.</span><span class="n">r</span><span class="p">[</span><span class="s2">"addthree"</span><span class="p">]</span> |
| |
| <span class="c1"># Invoke the function</span> |
| <span class="n">r</span> <span class="o">=</span> <span class="n">addthree</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span> |
| |
| <span class="c1"># Access the returned value</span> |
| <span class="n">value</span> <span class="o">=</span> <span class="n">r</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> |
| <span class="nb">print</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Running the <code class="docutils literal notranslate"><span class="pre">addthree.py</span></code> file will show how our Python code is able |
| to access the <code class="docutils literal notranslate"><span class="pre">R</span></code> function and print the expected result:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>addthree.py |
| <span class="m">6</span> |
| </pre></div> |
| </div> |
| <p>If instead of passing around basic data types we want to pass around |
| Arrow Arrays, we can do so relying on the |
| <a class="reference external" href="https://rpy2.github.io/rpy2-arrow/version/main/html/index.html">rpy2-arrow</a> |
| module which implements <code class="docutils literal notranslate"><span class="pre">rpy2</span></code> support for Arrow types.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">rpy2-arrow</span></code> can be installed through <code class="docutils literal notranslate"><span class="pre">pip</span></code>:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>pip<span class="w"> </span>install<span class="w"> </span>rpy2-arrow |
| </pre></div> |
| </div> |
| <p><code class="docutils literal notranslate"><span class="pre">rpy2-arrow</span></code> implements converters from PyArrow objects to R Arrow objects, |
| this is done without incurring any data copy cost as it relies on the |
| C Data interface.</p> |
| <p>To pass to the <code class="docutils literal notranslate"><span class="pre">addthree</span></code> function a PyArrow array, our <code class="docutils literal notranslate"><span class="pre">addthree.py</span></code> file needs to be modified |
| to enable <code class="docutils literal notranslate"><span class="pre">rpy2-arrow</span></code> converters and then pass the PyArrow array:</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">rpy2.robjects</span> <span class="k">as</span> <span class="nn">robjects</span> |
| <span class="kn">from</span> <span class="nn">rpy2_arrow.pyarrow_rarrow</span> <span class="kn">import</span> <span class="p">(</span><span class="n">rarrow_to_py_array</span><span class="p">,</span> |
| <span class="n">converter</span> <span class="k">as</span> <span class="n">arrowconverter</span><span class="p">)</span> |
| <span class="kn">from</span> <span class="nn">rpy2.robjects.conversion</span> <span class="kn">import</span> <span class="n">localconverter</span> |
| |
| <span class="n">r_source</span> <span class="o">=</span> <span class="n">robjects</span><span class="o">.</span><span class="n">r</span><span class="p">[</span><span class="s2">"source"</span><span class="p">]</span> |
| <span class="n">r_source</span><span class="p">(</span><span class="s2">"addthree.R"</span><span class="p">)</span> |
| |
| <span class="n">addthree</span> <span class="o">=</span> <span class="n">robjects</span><span class="o">.</span><span class="n">r</span><span class="p">[</span><span class="s2">"addthree"</span><span class="p">]</span> |
| |
| <span class="kn">import</span> <span class="nn">pyarrow</span> |
| |
| <span class="n">array</span> <span class="o">=</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">array</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span> |
| |
| <span class="c1"># Enable rpy2-arrow converter so that R can receive the array.</span> |
| <span class="k">with</span> <span class="n">localconverter</span><span class="p">(</span><span class="n">arrowconverter</span><span class="p">):</span> |
| <span class="n">r_result</span> <span class="o">=</span> <span class="n">addthree</span><span class="p">(</span><span class="n">array</span><span class="p">)</span> |
| |
| <span class="c1"># The result of the R function will be an R Environment</span> |
| <span class="c1"># we can convert the Environment back to a pyarrow Array</span> |
| <span class="c1"># using the rarrow_to_py_array function</span> |
| <span class="n">py_result</span> <span class="o">=</span> <span class="n">rarrow_to_py_array</span><span class="p">(</span><span class="n">r_result</span><span class="p">)</span> |
| <span class="nb">print</span><span class="p">(</span><span class="s2">"RESULT"</span><span class="p">,</span> <span class="nb">type</span><span class="p">(</span><span class="n">py_result</span><span class="p">),</span> <span class="n">py_result</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Running the newly modified <code class="docutils literal notranslate"><span class="pre">addthree.py</span></code> should now properly execute |
| the R function and print the resulting PyArrow Array:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>addthree.py |
| RESULT<span class="w"> </span><class<span class="w"> </span><span class="s1">'pyarrow.lib.Int64Array'</span>><span class="w"> </span><span class="o">[</span> |
| <span class="w"> </span><span class="m">4</span>, |
| <span class="w"> </span><span class="m">5</span>, |
| <span class="w"> </span><span class="m">6</span> |
| <span class="o">]</span> |
| </pre></div> |
| </div> |
| <p>For additional information you can refer to |
| <a class="reference external" href="https://rpy2.github.io/doc/latest/html/index.html">rpy2 Documentation</a> |
| and <a class="reference external" href="https://rpy2.github.io/rpy2-arrow/version/main/html/index.html">rpy2-arrow Documentation</a></p> |
| </section> |
| <section id="invoking-python-functions-from-r"> |
| <h2>Invoking Python functions from R<a class="headerlink" href="#invoking-python-functions-from-r" title="Permalink to this heading">#</a></h2> |
| <p>Exposing Python functions to R can be done through the <code class="docutils literal notranslate"><span class="pre">reticulate</span></code> |
| library. For example if we want to invoke <a class="reference internal" href="../generated/pyarrow.compute.add.html#pyarrow.compute.add" title="pyarrow.compute.add"><code class="xref py py-func docutils literal notranslate"><span class="pre">pyarrow.compute.add()</span></code></a> from |
| R on an Array created in R we can do so importing <code class="docutils literal notranslate"><span class="pre">pyarrow</span></code> in R |
| through <code class="docutils literal notranslate"><span class="pre">reticulate</span></code>.</p> |
| <p>A basic <code class="docutils literal notranslate"><span class="pre">addthree.R</span></code> script that invokes <code class="docutils literal notranslate"><span class="pre">add</span></code> to add <code class="docutils literal notranslate"><span class="pre">3</span></code> to |
| an R array would look like:</p> |
| <div class="highlight-R notranslate"><div class="highlight"><pre><span></span><span class="c1"># Load arrow and reticulate libraries</span> |
| <span class="nf">library</span><span class="p">(</span><span class="n">arrow</span><span class="p">)</span> |
| <span class="nf">library</span><span class="p">(</span><span class="n">reticulate</span><span class="p">)</span> |
| |
| <span class="c1"># Create a new array in R</span> |
| <span class="n">a</span><span class="w"> </span><span class="o"><-</span><span class="w"> </span><span class="n">Array</span><span class="o">$</span><span class="nf">create</span><span class="p">(</span><span class="nf">c</span><span class="p">(</span><span class="m">1</span><span class="p">,</span><span class="w"> </span><span class="m">2</span><span class="p">,</span><span class="w"> </span><span class="m">3</span><span class="p">))</span> |
| |
| <span class="c1"># Make pyarrow.compute available to R</span> |
| <span class="n">pc</span><span class="w"> </span><span class="o"><-</span><span class="w"> </span><span class="nf">import</span><span class="p">(</span><span class="s">"pyarrow.compute"</span><span class="p">)</span> |
| |
| <span class="c1"># Invoke pyarrow.compute.add with the array and 3</span> |
| <span class="c1"># This will add 3 to all elements of the array and return a new Array</span> |
| <span class="n">result</span><span class="w"> </span><span class="o"><-</span><span class="w"> </span><span class="n">pc</span><span class="o">$</span><span class="nf">add</span><span class="p">(</span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="m">3</span><span class="p">)</span> |
| |
| <span class="c1"># Print the result to confirm it's what we expect</span> |
| <span class="nf">print</span><span class="p">(</span><span class="n">result</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Invoking the <code class="docutils literal notranslate"><span class="pre">addthree.R</span></code> script will print the outcome of adding |
| <code class="docutils literal notranslate"><span class="pre">3</span></code> to all the elements of the original <code class="docutils literal notranslate"><span class="pre">Array$create(c(1,</span> <span class="pre">2,</span> <span class="pre">3))</span></code> array:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>R<span class="w"> </span>--silent<span class="w"> </span>-f<span class="w"> </span>addthree.R |
| Array |
| <double> |
| <span class="o">[</span> |
| <span class="w"> </span><span class="m">4</span>, |
| <span class="w"> </span><span class="m">5</span>, |
| <span class="w"> </span><span class="m">6</span> |
| <span class="o">]</span> |
| </pre></div> |
| </div> |
| <p>For additional information you can refer to |
| <a class="reference external" href="https://rstudio.github.io/reticulate/">Reticulate Documentation</a> |
| and to the <a class="reference external" href="https://arrow.apache.org/docs/r/articles/python.html#using">R Arrow documentation</a></p> |
| </section> |
| <section id="r-to-python-communication-using-the-c-data-interface"> |
| <h2>R to Python communication using the C Data Interface<a class="headerlink" href="#r-to-python-communication-using-the-c-data-interface" title="Permalink to this heading">#</a></h2> |
| <p>Both solutions described above use the Arrow C Data |
| interface under the hood.</p> |
| <p>In case we want to extend the previous <code class="docutils literal notranslate"><span class="pre">addthree</span></code> example to switch |
| from using <code class="docutils literal notranslate"><span class="pre">rpy2-arrow</span></code> to using the plain C Data interface we can |
| do so by introducing some modifications to our codebase.</p> |
| <p>To enable importing the Arrow Array from the C Data interface we have to |
| wrap our <code class="docutils literal notranslate"><span class="pre">addthree</span></code> function in a function that does the extra work |
| necessary to import an Arrow Array in R from the C Data interface.</p> |
| <p>That work will be done by the <code class="docutils literal notranslate"><span class="pre">addthree_cdata</span></code> function which invokes the |
| <code class="docutils literal notranslate"><span class="pre">addthree</span></code> function once the Array is imported.</p> |
| <p>Our <code class="docutils literal notranslate"><span class="pre">addthree.R</span></code> will thus have both the <code class="docutils literal notranslate"><span class="pre">addthree_cdata</span></code> and the |
| <code class="docutils literal notranslate"><span class="pre">addthree</span></code> functions:</p> |
| <div class="highlight-R notranslate"><div class="highlight"><pre><span></span><span class="nf">library</span><span class="p">(</span><span class="n">arrow</span><span class="p">)</span> |
| |
| <span class="n">addthree_cdata</span><span class="w"> </span><span class="o"><-</span><span class="w"> </span><span class="nf">function</span><span class="p">(</span><span class="n">array_ptr_s</span><span class="p">,</span><span class="w"> </span><span class="n">schema_ptr_s</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">a</span><span class="w"> </span><span class="o"><-</span><span class="w"> </span><span class="n">Array</span><span class="o">$</span><span class="nf">import_from_c</span><span class="p">(</span><span class="n">array_ptr</span><span class="p">,</span><span class="w"> </span><span class="n">schema_ptr</span><span class="p">)</span> |
| |
| <span class="w"> </span><span class="nf">return</span><span class="p">(</span><span class="nf">addthree</span><span class="p">(</span><span class="n">a</span><span class="p">))</span> |
| <span class="p">}</span> |
| |
| <span class="n">addthree</span><span class="w"> </span><span class="o"><-</span><span class="w"> </span><span class="nf">function</span><span class="p">(</span><span class="n">arr</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="nf">return</span><span class="p">(</span><span class="n">arr</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="m">3L</span><span class="p">)</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>We can now provide to R the array and its schema from Python through the |
| <code class="docutils literal notranslate"><span class="pre">array_ptr_s</span></code> and <code class="docutils literal notranslate"><span class="pre">schema_ptr_s</span></code> arguments so that R can build back |
| an <code class="docutils literal notranslate"><span class="pre">Array</span></code> from them and then invoke <code class="docutils literal notranslate"><span class="pre">addthree</span></code> with the array.</p> |
| <p>Invoking <code class="docutils literal notranslate"><span class="pre">addthree_cdata</span></code> from Python involves building the Array we |
| want to pass to <code class="docutils literal notranslate"><span class="pre">R</span></code>, exporting it to the C Data interface and then |
| passing the exported references to the <code class="docutils literal notranslate"><span class="pre">R</span></code> function.</p> |
| <p>Our <code class="docutils literal notranslate"><span class="pre">addthree.py</span></code> will thus become:</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># Get a reference to the addthree_cdata R function</span> |
| <span class="kn">import</span> <span class="nn">rpy2.robjects</span> <span class="k">as</span> <span class="nn">robjects</span> |
| <span class="n">r_source</span> <span class="o">=</span> <span class="n">robjects</span><span class="o">.</span><span class="n">r</span><span class="p">[</span><span class="s2">"source"</span><span class="p">]</span> |
| <span class="n">r_source</span><span class="p">(</span><span class="s2">"addthree.R"</span><span class="p">)</span> |
| <span class="n">addthree_cdata</span> <span class="o">=</span> <span class="n">robjects</span><span class="o">.</span><span class="n">r</span><span class="p">[</span><span class="s2">"addthree_cdata"</span><span class="p">]</span> |
| |
| <span class="c1"># Create the pyarrow array we want to pass to R</span> |
| <span class="kn">import</span> <span class="nn">pyarrow</span> |
| <span class="n">array</span> <span class="o">=</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">array</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span> |
| |
| <span class="c1"># Import the pyarrow module that provides access to the C Data interface</span> |
| <span class="kn">from</span> <span class="nn">pyarrow.cffi</span> <span class="kn">import</span> <span class="n">ffi</span> <span class="k">as</span> <span class="n">arrow_c</span> |
| |
| <span class="c1"># Allocate structures where we will export the Array data</span> |
| <span class="c1"># and the Array schema. They will be released when we exit the with block.</span> |
| <span class="k">with</span> <span class="n">arrow_c</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s2">"struct ArrowArray*"</span><span class="p">)</span> <span class="k">as</span> <span class="n">c_array</span><span class="p">,</span> \ |
| <span class="n">arrow_c</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s2">"struct ArrowSchema*"</span><span class="p">)</span> <span class="k">as</span> <span class="n">c_schema</span><span class="p">:</span> |
| <span class="c1"># Get the references to the C Data structures.</span> |
| <span class="n">c_array_ptr</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">arrow_c</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="s2">"uintptr_t"</span><span class="p">,</span> <span class="n">c_array</span><span class="p">))</span> |
| <span class="n">c_schema_ptr</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">arrow_c</span><span class="o">.</span><span class="n">cast</span><span class="p">(</span><span class="s2">"uintptr_t"</span><span class="p">,</span> <span class="n">c_schema</span><span class="p">))</span> |
| |
| <span class="c1"># Export the Array and its schema to the C Data structures.</span> |
| <span class="n">array</span><span class="o">.</span><span class="n">_export_to_c</span><span class="p">(</span><span class="n">c_array_ptr</span><span class="p">)</span> |
| <span class="n">array</span><span class="o">.</span><span class="n">type</span><span class="o">.</span><span class="n">_export_to_c</span><span class="p">(</span><span class="n">c_schema_ptr</span><span class="p">)</span> |
| |
| <span class="c1"># Invoke the R addthree_cdata function passing the references</span> |
| <span class="c1"># to the array and schema C Data structures.</span> |
| <span class="c1"># Those references are passed as strings as R doesn't have</span> |
| <span class="c1"># native support for 64bit integers, so the integers are</span> |
| <span class="c1"># converted to their string representation for R to convert it back.</span> |
| <span class="n">r_result_array</span> <span class="o">=</span> <span class="n">addthree_cdata</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">c_array_ptr</span><span class="p">),</span> <span class="nb">str</span><span class="p">(</span><span class="n">c_schema_ptr</span><span class="p">))</span> |
| |
| <span class="c1"># r_result will be an Environment variable that contains the</span> |
| <span class="c1"># arrow Array built from R as the return value of addthree.</span> |
| <span class="c1"># To make it available as a Python pyarrow array we need to export</span> |
| <span class="c1"># it as a C Data structure invoking the Array$export_to_c R method</span> |
| <span class="n">r_result_array</span><span class="p">[</span><span class="s2">"export_to_c"</span><span class="p">](</span><span class="nb">str</span><span class="p">(</span><span class="n">c_array_ptr</span><span class="p">),</span> <span class="nb">str</span><span class="p">(</span><span class="n">c_schema_ptr</span><span class="p">))</span> |
| |
| <span class="c1"># Once the returned array is exported to a C Data infrastructure</span> |
| <span class="c1"># we can import it back into pyarrow using Array._import_from_c</span> |
| <span class="n">py_array</span> <span class="o">=</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">Array</span><span class="o">.</span><span class="n">_import_from_c</span><span class="p">(</span><span class="n">c_array_ptr</span><span class="p">,</span> <span class="n">c_schema_ptr</span><span class="p">)</span> |
| |
| <span class="nb">print</span><span class="p">(</span><span class="s2">"RESULT"</span><span class="p">,</span> <span class="n">py_array</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Running the newly changed <code class="docutils literal notranslate"><span class="pre">addthree.py</span></code> will now print the Array resulting |
| from adding <code class="docutils literal notranslate"><span class="pre">3</span></code> to all the elements of the original |
| <code class="docutils literal notranslate"><span class="pre">pyarrow.array((1,</span> <span class="pre">2,</span> <span class="pre">3))</span></code> array:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>addthree.py |
| R<span class="o">[</span>write<span class="w"> </span>to<span class="w"> </span>console<span class="o">]</span>:<span class="w"> </span>Attaching<span class="w"> </span>package:<span class="w"> </span>‘arrow’ |
| RESULT<span class="w"> </span><span class="o">[</span> |
| <span class="w"> </span><span class="m">4</span>, |
| <span class="w"> </span><span class="m">5</span>, |
| <span class="w"> </span><span class="m">6</span> |
| <span class="o">]</span> |
| </pre></div> |
| </div> |
| </section> |
| </section> |
| |
| |
| </article> |
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