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| <section id="upgrade-guides"> |
| <h1>Upgrade Guides<a class="headerlink" href="#upgrade-guides" title="Link to this heading">#</a></h1> |
| <section id="datafusion-54-0-0"> |
| <h2>DataFusion 54.0.0<a class="headerlink" href="#datafusion-54-0-0" title="Link to this heading">#</a></h2> |
| <p>The <code class="docutils literal notranslate"><span class="pre">Config</span></code> class has been removed. It was a standalone wrapper around |
| <code class="docutils literal notranslate"><span class="pre">ConfigOptions</span></code> that could not be connected to a <code class="docutils literal notranslate"><span class="pre">SessionContext</span></code>, making it |
| effectively unusable. Use <a class="reference internal" href="../autoapi/datafusion/context/index.html#datafusion.context.SessionConfig" title="datafusion.context.SessionConfig"><code class="xref py py-class docutils literal notranslate"><span class="pre">SessionConfig</span></code></a> instead, |
| which is passed directly to <code class="docutils literal notranslate"><span class="pre">SessionContext</span></code>.</p> |
| <p>Before:</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">datafusion</span><span class="w"> </span><span class="kn">import</span> <span class="n">Config</span> |
| |
| <span class="n">config</span> <span class="o">=</span> <span class="n">Config</span><span class="p">()</span> |
| <span class="n">config</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"datafusion.execution.batch_size"</span><span class="p">,</span> <span class="s2">"4096"</span><span class="p">)</span> |
| <span class="c1"># config could not be passed to SessionContext</span> |
| </pre></div> |
| </div> |
| <p>After:</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">datafusion</span><span class="w"> </span><span class="kn">import</span> <span class="n">SessionConfig</span><span class="p">,</span> <span class="n">SessionContext</span> |
| |
| <span class="n">config</span> <span class="o">=</span> <span class="n">SessionConfig</span><span class="p">()</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"datafusion.execution.batch_size"</span><span class="p">,</span> <span class="s2">"4096"</span><span class="p">)</span> |
| <span class="n">ctx</span> <span class="o">=</span> <span class="n">SessionContext</span><span class="p">(</span><span class="n">config</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>The aggregate functions <a class="reference internal" href="../autoapi/datafusion/functions/index.html#datafusion.functions.sum" title="datafusion.functions.sum"><code class="xref py py-func docutils literal notranslate"><span class="pre">sum()</span></code></a> and |
| <a class="reference internal" href="../autoapi/datafusion/functions/index.html#datafusion.functions.avg" title="datafusion.functions.avg"><code class="xref py py-func docutils literal notranslate"><span class="pre">avg()</span></code></a> now accept a <code class="docutils literal notranslate"><span class="pre">distinct</span></code> argument, matching |
| the other aggregate functions. <code class="docutils literal notranslate"><span class="pre">distinct</span></code> is inserted <em>before</em> <code class="docutils literal notranslate"><span class="pre">filter</span></code> in the |
| argument list, so any code that passed <code class="docutils literal notranslate"><span class="pre">filter</span></code> positionally must be updated to |
| pass it as a keyword argument. The types are distinct so a type checker should flag this.</p> |
| <p>Before:</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">f</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">column</span><span class="p">(</span><span class="s2">"a"</span><span class="p">),</span> <span class="n">my_filter</span><span class="p">)</span> |
| <span class="n">f</span><span class="o">.</span><span class="n">avg</span><span class="p">(</span><span class="n">column</span><span class="p">(</span><span class="s2">"a"</span><span class="p">),</span> <span class="n">my_filter</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Now:</p> |
| <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">f</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">column</span><span class="p">(</span><span class="s2">"a"</span><span class="p">),</span> <span class="nb">filter</span><span class="o">=</span><span class="n">my_filter</span><span class="p">)</span> |
| <span class="n">f</span><span class="o">.</span><span class="n">avg</span><span class="p">(</span><span class="n">column</span><span class="p">(</span><span class="s2">"a"</span><span class="p">),</span> <span class="nb">filter</span><span class="o">=</span><span class="n">my_filter</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="datafusion-53-0-0"> |
| <h2>DataFusion 53.0.0<a class="headerlink" href="#datafusion-53-0-0" title="Link to this heading">#</a></h2> |
| <p>This version includes an upgraded version of <code class="docutils literal notranslate"><span class="pre">pyo3</span></code>, which changed the way to extract an FFI |
| object. Example:</p> |
| <p>Before:</p> |
| <div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span><span class="w"> </span><span class="n">codec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">unsafe</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">capsule</span><span class="p">.</span><span class="n">reference</span><span class="p">::</span><span class="o"><</span><span class="n">FFI_LogicalExtensionCodec</span><span class="o">></span><span class="p">()</span><span class="w"> </span><span class="p">};</span> |
| </pre></div> |
| </div> |
| <p>Now:</p> |
| <div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="kd">let</span><span class="w"> </span><span class="n">data</span><span class="p">:</span><span class="w"> </span><span class="nc">NonNull</span><span class="o"><</span><span class="n">FFI_LogicalExtensionCodec</span><span class="o">></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">capsule</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">pointer_checked</span><span class="p">(</span><span class="nb">Some</span><span class="p">(</span><span class="n">c_str</span><span class="o">!</span><span class="p">(</span><span class="s">"datafusion_logical_extension_codec"</span><span class="p">)))</span><span class="o">?</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">cast</span><span class="p">();</span> |
| <span class="kd">let</span><span class="w"> </span><span class="n">codec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">unsafe</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">data</span><span class="p">.</span><span class="n">as_ref</span><span class="p">()</span><span class="w"> </span><span class="p">};</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="datafusion-52-0-0"> |
| <h2>DataFusion 52.0.0<a class="headerlink" href="#datafusion-52-0-0" title="Link to this heading">#</a></h2> |
| <p>This version includes a major update to the <a class="reference internal" href="../contributor-guide/ffi.html#ffi"><span class="std std-ref">Python Extensions</span></a> due to upgrades |
| to the <a class="reference external" href="https://doc.rust-lang.org/nomicon/ffi.html">Foreign Function Interface</a>. |
| Users who contribute their own <code class="docutils literal notranslate"><span class="pre">CatalogProvider</span></code>, <code class="docutils literal notranslate"><span class="pre">SchemaProvider</span></code>, |
| <code class="docutils literal notranslate"><span class="pre">TableProvider</span></code> or <code class="docutils literal notranslate"><span class="pre">TableFunction</span></code> via FFI must now provide access to a |
| <code class="docutils literal notranslate"><span class="pre">LogicalExtensionCodec</span></code> and a <code class="docutils literal notranslate"><span class="pre">TaskContextProvider</span></code>. The function signatures |
| for the methods to get these <code class="docutils literal notranslate"><span class="pre">PyCapsule</span></code> objects now requires an additional |
| parameter, which is a Python object that can be used to extract the |
| <code class="docutils literal notranslate"><span class="pre">FFI_LogicalExtensionCodec</span></code> that is necessary.</p> |
| <p>A complete example can be found in the <a class="reference external" href="https://github.com/apache/datafusion-python/tree/main/examples/datafusion-ffi-example">FFI example</a>. |
| Your FFI hook methods — <code class="docutils literal notranslate"><span class="pre">__datafusion_catalog_provider__</span></code>, |
| <code class="docutils literal notranslate"><span class="pre">__datafusion_schema_provider__</span></code>, <code class="docutils literal notranslate"><span class="pre">__datafusion_table_provider__</span></code>, and |
| <code class="docutils literal notranslate"><span class="pre">__datafusion_table_function__</span></code> — need to be updated to accept an additional |
| <code class="docutils literal notranslate"><span class="pre">session:</span> <span class="pre">Bound<PyAny></span></code> parameter, as shown in this example.</p> |
| <div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="cp">#[pymethods]</span> |
| <span class="k">impl</span><span class="w"> </span><span class="n">MyCatalogProvider</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">pub</span><span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="nf">__datafusion_catalog_provider__</span><span class="o"><'</span><span class="na">py</span><span class="o">></span><span class="p">(</span> |
| <span class="w"> </span><span class="o">&</span><span class="bp">self</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">py</span><span class="p">:</span><span class="w"> </span><span class="nc">Python</span><span class="o"><'</span><span class="na">py</span><span class="o">></span><span class="p">,</span> |
| <span class="w"> </span><span class="n">session</span><span class="p">:</span><span class="w"> </span><span class="nc">Bound</span><span class="o"><</span><span class="n">PyAny</span><span class="o">></span><span class="p">,</span> |
| <span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="nc">PyResult</span><span class="o"><</span><span class="n">Bound</span><span class="o"><'</span><span class="na">py</span><span class="p">,</span><span class="w"> </span><span class="n">PyCapsule</span><span class="o">>></span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">cr</span><span class="s">"datafusion_catalog_provider"</span><span class="p">.</span><span class="n">into</span><span class="p">();</span> |
| |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">provider</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Arc</span><span class="p">::</span><span class="n">clone</span><span class="p">(</span><span class="o">&</span><span class="bp">self</span><span class="p">.</span><span class="n">inner</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="n">Arc</span><span class="o"><</span><span class="k">dyn</span><span class="w"> </span><span class="n">CatalogProvider</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="nb">Send</span><span class="o">></span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">codec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ffi_logical_codec_from_pycapsule</span><span class="p">(</span><span class="n">session</span><span class="p">)</span><span class="o">?</span><span class="p">;</span> |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">provider</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">FFI_CatalogProvider</span><span class="p">::</span><span class="n">new_with_ffi_codec</span><span class="p">(</span><span class="n">provider</span><span class="p">,</span><span class="w"> </span><span class="nb">None</span><span class="p">,</span><span class="w"> </span><span class="n">codec</span><span class="p">);</span> |
| |
| <span class="w"> </span><span class="n">PyCapsule</span><span class="p">::</span><span class="n">new</span><span class="p">(</span><span class="n">py</span><span class="p">,</span><span class="w"> </span><span class="n">provider</span><span class="p">,</span><span class="w"> </span><span class="nb">Some</span><span class="p">(</span><span class="n">name</span><span class="p">))</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>To extract the logical extension codec FFI object from the provided object you |
| can implement a helper method such as:</p> |
| <div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="k">pub</span><span class="p">(</span><span class="k">crate</span><span class="p">)</span><span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="nf">ffi_logical_codec_from_pycapsule</span><span class="p">(</span> |
| <span class="w"> </span><span class="n">obj</span><span class="p">:</span><span class="w"> </span><span class="nc">Bound</span><span class="o"><</span><span class="n">PyAny</span><span class="o">></span><span class="p">,</span> |
| <span class="p">)</span><span class="w"> </span><span class="p">-></span><span class="w"> </span><span class="nc">PyResult</span><span class="o"><</span><span class="n">FFI_LogicalExtensionCodec</span><span class="o">></span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">attr_name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"__datafusion_logical_extension_codec__"</span><span class="p">;</span> |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">capsule</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">obj</span><span class="p">.</span><span class="n">hasattr</span><span class="p">(</span><span class="n">attr_name</span><span class="p">)</span><span class="o">?</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">obj</span><span class="p">.</span><span class="n">getattr</span><span class="p">(</span><span class="n">attr_name</span><span class="p">)</span><span class="o">?</span><span class="p">.</span><span class="n">call0</span><span class="p">()</span><span class="o">?</span> |
| <span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">obj</span> |
| <span class="w"> </span><span class="p">};</span> |
| |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">capsule</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">capsule</span><span class="p">.</span><span class="n">downcast</span><span class="p">::</span><span class="o"><</span><span class="n">PyCapsule</span><span class="o">></span><span class="p">()</span><span class="o">?</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">validate_pycapsule</span><span class="p">(</span><span class="n">capsule</span><span class="p">,</span><span class="w"> </span><span class="s">"datafusion_logical_extension_codec"</span><span class="p">)</span><span class="o">?</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="kd">let</span><span class="w"> </span><span class="n">codec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">unsafe</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">capsule</span><span class="p">.</span><span class="n">reference</span><span class="p">::</span><span class="o"><</span><span class="n">FFI_LogicalExtensionCodec</span><span class="o">></span><span class="p">()</span><span class="w"> </span><span class="p">};</span> |
| |
| <span class="w"> </span><span class="nb">Ok</span><span class="p">(</span><span class="n">codec</span><span class="p">.</span><span class="n">clone</span><span class="p">())</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>The DataFusion FFI interface updates no longer depend directly on the |
| <code class="docutils literal notranslate"><span class="pre">datafusion</span></code> core crate. You can improve your build times and potentially |
| reduce your library binary size by removing this dependency and instead |
| using the specific datafusion project crates.</p> |
| <p>For example, instead of including expressions like:</p> |
| <div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="k">use</span><span class="w"> </span><span class="n">datafusion</span><span class="p">::</span><span class="n">catalog</span><span class="p">::</span><span class="n">MemTable</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>Instead you can now write:</p> |
| <div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="k">use</span><span class="w"> </span><span class="n">datafusion_catalog</span><span class="p">::</span><span class="n">MemTable</span><span class="p">;</span> |
| </pre></div> |
| </div> |
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