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| <section id="conversion-of-range-of-std-tuple-like-to-table-instances"> |
| <h1>Conversion of range of <code class="docutils literal notranslate"><span class="pre">std::tuple</span></code>-like to <code class="docutils literal notranslate"><span class="pre">Table</span></code> instances<a class="headerlink" href="#conversion-of-range-of-std-tuple-like-to-table-instances" title="Permalink to this heading">#</a></h1> |
| <p>While the above example shows a quite manual approach of a row to columnar |
| conversion, Arrow also provides some template logic to convert ranges of |
| <code class="docutils literal notranslate"><span class="pre">std::tuple<..></span></code>-like objects to tables.</p> |
| <p>In the most simple case, you only need to provide the input data and the |
| type conversion is then inferred at compile time.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n">tuple</span><span class="o"><</span><span class="kt">double</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">>></span><span class="w"> </span><span class="n">rows</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">..</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Table</span><span class="o">></span><span class="w"> </span><span class="n">table</span><span class="p">;</span> |
| |
| <span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="n">arrow</span><span class="o">::</span><span class="n">stl</span><span class="o">::</span><span class="n">TableFromTupleRange</span><span class="p">(</span> |
| <span class="w"> </span><span class="n">arrow</span><span class="o">::</span><span class="n">default_memory_pool</span><span class="p">(),</span> |
| <span class="w"> </span><span class="n">rows</span><span class="p">,</span><span class="w"> </span><span class="n">names</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">table</span><span class="p">).</span><span class="n">ok</span><span class="p">()</span> |
| <span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="c1">// Error handling code should go here.</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>In reverse, you can use <code class="docutils literal notranslate"><span class="pre">TupleRangeFromTable</span></code> to fill an already |
| pre-allocated range with the data from a <code class="docutils literal notranslate"><span class="pre">Table</span></code> instance.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// An important aspect here is that the table columns need to be in the</span> |
| <span class="c1">// same order as the columns will later appear in the tuple. As the tuple</span> |
| <span class="c1">// is unnamed, matching is done on positions.</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Table</span><span class="o">></span><span class="w"> </span><span class="n">table</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">..</span> |
| |
| <span class="c1">// The range needs to be pre-allocated to the respective amount of rows.</span> |
| <span class="c1">// This allows us to pass in an arbitrary range object, not only</span> |
| <span class="c1">// `std::vector`.</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="n">std</span><span class="o">::</span><span class="n">tuple</span><span class="o"><</span><span class="kt">double</span><span class="p">,</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">>></span><span class="w"> </span><span class="n">rows</span><span class="p">(</span><span class="mi">2</span><span class="p">);</span> |
| <span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">!</span><span class="n">arrow</span><span class="o">::</span><span class="n">stl</span><span class="o">::</span><span class="n">TupleRangeFromTable</span><span class="p">(</span><span class="o">*</span><span class="n">table</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">rows</span><span class="p">).</span><span class="n">ok</span><span class="p">())</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="c1">// Error handling code should go here.</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>Arrow itself already supports some C(++) data types for this conversion. If you |
| want to support additional data types, you need to implement a specialization |
| of <code class="docutils literal notranslate"><span class="pre">arrow::stl::ConversionTraits<T></span></code> and the more general |
| <code class="docutils literal notranslate"><span class="pre">arrow::CTypeTraits<T></span></code>.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">namespace</span><span class="w"> </span><span class="nn">arrow</span><span class="w"> </span><span class="p">{</span> |
| |
| <span class="k">template</span><span class="o"><></span> |
| <span class="k">struct</span><span class="w"> </span><span class="nc">CTypeTraits</span><span class="o"><</span><span class="n">boost</span><span class="o">::</span><span class="n">posix_time</span><span class="o">::</span><span class="n">ptime</span><span class="o">></span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">ArrowType</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">TimestampType</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><::</span><span class="n">arrow</span><span class="o">::</span><span class="n">DataType</span><span class="o">></span><span class="w"> </span><span class="n">type_singleton</span><span class="p">()</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">timestamp</span><span class="p">(</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">TimeUnit</span><span class="o">::</span><span class="n">MICRO</span><span class="p">);</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">};</span> |
| |
| <span class="p">}</span> |
| |
| <span class="k">namespace</span><span class="w"> </span><span class="nn">arrow</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">stl</span><span class="w"> </span><span class="p">{</span> |
| |
| <span class="k">template</span><span class="w"> </span><span class="o"><></span> |
| <span class="k">struct</span><span class="w"> </span><span class="nc">ConversionTraits</span><span class="o"><</span><span class="n">boost</span><span class="o">::</span><span class="n">posix_time</span><span class="o">::</span><span class="n">ptime</span><span class="o">></span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n">CTypeTraits</span><span class="o"><</span><span class="n">boost</span><span class="o">::</span><span class="n">posix_time</span><span class="o">::</span><span class="n">ptime</span><span class="o">></span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">nullable</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="c1">// This is the specialization to load a scalar value into an Arrow builder.</span> |
| <span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="n">Status</span><span class="w"> </span><span class="nf">AppendRow</span><span class="p">(</span> |
| <span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">TypeTraits</span><span class="o"><</span><span class="n">TimestampType</span><span class="o">>::</span><span class="n">BuilderType</span><span class="o">&</span><span class="w"> </span><span class="n">builder</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">boost</span><span class="o">::</span><span class="n">posix_time</span><span class="o">::</span><span class="n">ptime</span><span class="w"> </span><span class="n">cell</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">boost</span><span class="o">::</span><span class="n">posix_time</span><span class="o">::</span><span class="n">ptime</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">epoch</span><span class="p">({</span><span class="mi">1970</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">},</span><span class="w"> </span><span class="p">{</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">});</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">((</span><span class="n">cell</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">epoch</span><span class="p">).</span><span class="n">total_microseconds</span><span class="p">());</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="c1">// Specify how we can fill the tuple from the values stored in the Arrow</span> |
| <span class="w"> </span><span class="c1">// array.</span> |
| <span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="n">boost</span><span class="o">::</span><span class="n">posix_time</span><span class="o">::</span><span class="n">ptime</span><span class="w"> </span><span class="nf">GetEntry</span><span class="p">(</span> |
| <span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">TimestampArray</span><span class="o">&</span><span class="w"> </span><span class="n">array</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">j</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">psapp</span><span class="o">::</span><span class="n">arrow</span><span class="o">::</span><span class="n">internal</span><span class="o">::</span><span class="n">timestamp_epoch</span> |
| <span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">boost</span><span class="o">::</span><span class="n">posix_time</span><span class="o">::</span><span class="n">time_duration</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="n">array</span><span class="p">.</span><span class="n">Value</span><span class="p">(</span><span class="n">j</span><span class="p">));</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">};</span> |
| |
| <span class="p">}}</span> |
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