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| |
| <section id="arrays"> |
| <h1>Arrays<a class="headerlink" href="#arrays" title="Permalink to this heading">¶</a></h1> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <p><a class="reference internal" href="api/array.html"><span class="doc">Array API reference</span></a></p> |
| </div> |
| <p>The central type in Arrow is the class <a class="reference internal" href="api/array.html#_CPPv4N5arrow5ArrayE" title="arrow::Array"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Array</span></code></a>. An array |
| represents a known-length sequence of values all having the same type. |
| Internally, those values are represented by one or several buffers, the |
| number and meaning of which depend on the array’s data type, as documented |
| in <a class="reference internal" href="../format/Columnar.html#format-layout"><span class="std std-ref">the Arrow data layout specification</span></a>.</p> |
| <p>Those buffers consist of the value data itself and an optional bitmap buffer |
| that indicates which array entries are null values. The bitmap buffer |
| can be entirely omitted if the array is known to have zero null values.</p> |
| <p>There are concrete subclasses of <a class="reference internal" href="api/array.html#_CPPv4N5arrow5ArrayE" title="arrow::Array"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Array</span></code></a> for each data type, |
| that help you access individual values of the array.</p> |
| <section id="building-an-array"> |
| <h2>Building an array<a class="headerlink" href="#building-an-array" title="Permalink to this heading">¶</a></h2> |
| <section id="available-strategies"> |
| <h3>Available strategies<a class="headerlink" href="#available-strategies" title="Permalink to this heading">¶</a></h3> |
| <p>As Arrow objects are immutable, they cannot be populated directly like for |
| example a <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>. Instead, several strategies can be used:</p> |
| <ul> |
| <li><p>if the data already exists in memory with the right layout, you can wrap |
| said memory inside <a class="reference internal" href="api/memory.html#_CPPv4N5arrow6BufferE" title="arrow::Buffer"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Buffer</span></code></a> instances and then construct |
| a <a class="reference internal" href="api/array.html#_CPPv4N5arrow9ArrayDataE" title="arrow::ArrayData"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::ArrayData</span></code></a> describing the array;</p> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <p><a class="reference internal" href="memory.html#cpp-memory-management"><span class="std std-ref">Memory Management</span></a></p> |
| </div> |
| </li> |
| <li><p>otherwise, the <a class="reference internal" href="api/builder.html#_CPPv4N5arrow12ArrayBuilderE" title="arrow::ArrayBuilder"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::ArrayBuilder</span></code></a> base class and its concrete |
| subclasses help building up array data incrementally, without having to |
| deal with details of the Arrow format yourself.</p></li> |
| </ul> |
| </section> |
| <section id="using-arraybuilder-and-its-subclasses"> |
| <h3>Using ArrayBuilder and its subclasses<a class="headerlink" href="#using-arraybuilder-and-its-subclasses" title="Permalink to this heading">¶</a></h3> |
| <p>To build an <code class="docutils literal notranslate"><span class="pre">Int64</span></code> Arrow array, we can use the <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Int64Builder</span></code> |
| class. In the following example, we build an array of the range 1 to 8 where |
| the element that should hold the value 4 is nulled:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">arrow</span><span class="o">::</span><span class="n">Int64Builder</span><span class="w"> </span><span class="n">builder</span><span class="p">;</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">2</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">AppendNull</span><span class="p">();</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">7</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">8</span><span class="p">);</span> |
| |
| <span class="k">auto</span><span class="w"> </span><span class="n">maybe_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="n">Finish</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">maybe_array</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">// ... do something on array building failure</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">arrow</span><span class="o">::</span><span class="n">Array</span><span class="o">></span><span class="w"> </span><span class="n">array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">*</span><span class="n">maybe_array</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>The resulting Array (which can be casted to the concrete <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Int64Array</span></code> |
| subclass if you want to access its values) then consists of two |
| <a class="reference internal" href="api/memory.html#_CPPv4N5arrow6BufferE" title="arrow::Buffer"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Buffer</span></code></a>s. |
| The first buffer holds the null bitmap, which consists here of a single byte with |
| the bits <code class="docutils literal notranslate"><span class="pre">1|1|1|1|0|1|1|1</span></code>. As we use <a class="reference external" href="https://en.wikipedia.org/wiki/Bit_numbering">least-significant bit (LSB) numbering</a>, |
| this indicates that the fourth entry in the array is null. The second |
| buffer is simply an <code class="docutils literal notranslate"><span class="pre">int64_t</span></code> array containing all the above values. |
| As the fourth entry is null, the value at that position in the buffer is |
| undefined.</p> |
| <p>Here is how you could access the concrete array’s contents:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// Cast the Array to its actual type to access its data</span> |
| <span class="k">auto</span><span class="w"> </span><span class="n">int64_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">static_pointer_cast</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">Int64Array</span><span class="o">></span><span class="p">(</span><span class="n">array</span><span class="p">);</span> |
| |
| <span class="c1">// Get the pointer to the null bitmap</span> |
| <span class="k">const</span><span class="w"> </span><span class="kt">uint8_t</span><span class="o">*</span><span class="w"> </span><span class="n">null_bitmap</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">int64_array</span><span class="o">-></span><span class="n">null_bitmap_data</span><span class="p">();</span> |
| |
| <span class="c1">// Get the pointer to the actual data</span> |
| <span class="k">const</span><span class="w"> </span><span class="kt">int64_t</span><span class="o">*</span><span class="w"> </span><span class="n">data</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">int64_array</span><span class="o">-></span><span class="n">raw_values</span><span class="p">();</span> |
| |
| <span class="c1">// Alternatively, given an array index, query its null bit and value directly</span> |
| <span class="kt">int64_t</span><span class="w"> </span><span class="n">index</span><span class="w"> </span><span class="o">=</span><span class="w"> </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">int64_array</span><span class="o">-></span><span class="n">IsNull</span><span class="p">(</span><span class="n">index</span><span class="p">))</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="kt">int64_t</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">int64_array</span><span class="o">-></span><span class="n">Value</span><span class="p">(</span><span class="n">index</span><span class="p">);</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Int64Array</span></code> (respectively <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::Int64Builder</span></code>) is |
| just a <code class="docutils literal notranslate"><span class="pre">typedef</span></code>, provided for convenience, of <code class="docutils literal notranslate"><span class="pre">arrow::NumericArray<Int64Type></span></code> |
| (respectively <code class="docutils literal notranslate"><span class="pre">arrow::NumericBuilder<Int64Type></span></code>).</p> |
| </div> |
| </section> |
| <section id="performance"> |
| <h3>Performance<a class="headerlink" href="#performance" title="Permalink to this heading">¶</a></h3> |
| <p>While it is possible to build an array value-by-value as in the example above, |
| to attain highest performance it is recommended to use the bulk appending |
| methods (usually named <code class="docutils literal notranslate"><span class="pre">AppendValues</span></code>) in the concrete <a class="reference internal" href="api/builder.html#_CPPv4N5arrow12ArrayBuilderE" title="arrow::ArrayBuilder"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::ArrayBuilder</span></code></a> |
| subclasses.</p> |
| <p>If you know the number of elements in advance, it is also recommended to |
| presize the working area by calling the <a class="reference internal" href="api/builder.html#_CPPv4N5arrow12ArrayBuilder6ResizeE7int64_t" title="arrow::ArrayBuilder::Resize"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">Resize()</span></code></a> |
| or <a class="reference internal" href="api/builder.html#_CPPv4N5arrow12ArrayBuilder7ReserveE7int64_t" title="arrow::ArrayBuilder::Reserve"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">Reserve()</span></code></a> methods.</p> |
| <p>Here is how one could rewrite the above example to take advantage of those |
| APIs:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">arrow</span><span class="o">::</span><span class="n">Int64Builder</span><span class="w"> </span><span class="n">builder</span><span class="p">;</span> |
| <span class="c1">// Make place for 8 values in total</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Reserve</span><span class="p">(</span><span class="mi">8</span><span class="p">);</span> |
| <span class="c1">// Bulk append the given values (with a null in 4th place as indicated by the</span> |
| <span class="c1">// validity vector)</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="kt">bool</span><span class="o">></span><span class="w"> </span><span class="n">validity</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="nb">true</span><span class="p">,</span><span class="w"> </span><span class="nb">true</span><span class="p">,</span><span class="w"> </span><span class="nb">true</span><span class="p">,</span><span class="w"> </span><span class="nb">false</span><span class="p">,</span><span class="w"> </span><span class="nb">true</span><span class="p">,</span><span class="w"> </span><span class="nb">true</span><span class="p">,</span><span class="w"> </span><span class="nb">true</span><span class="p">,</span><span class="w"> </span><span class="nb">true</span><span class="p">};</span> |
| <span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="kt">int64_t</span><span class="o">></span><span class="w"> </span><span class="n">values</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</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">5</span><span class="p">,</span><span class="w"> </span><span class="mi">6</span><span class="p">,</span><span class="w"> </span><span class="mi">7</span><span class="p">,</span><span class="w"> </span><span class="mi">8</span><span class="p">};</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">AppendValues</span><span class="p">(</span><span class="n">values</span><span class="p">,</span><span class="w"> </span><span class="n">validity</span><span class="p">);</span> |
| |
| <span class="k">auto</span><span class="w"> </span><span class="n">maybe_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="n">Finish</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| <p>If you still must append values one by one, some concrete builder subclasses |
| have methods marked “Unsafe” that assume the working area has been correctly |
| presized, and offer higher performance in exchange:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">arrow</span><span class="o">::</span><span class="n">Int64Builder</span><span class="w"> </span><span class="n">builder</span><span class="p">;</span> |
| <span class="c1">// Make place for 8 values in total</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Reserve</span><span class="p">(</span><span class="mi">8</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppend</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppend</span><span class="p">(</span><span class="mi">2</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppend</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppendNull</span><span class="p">();</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppend</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppend</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppend</span><span class="p">(</span><span class="mi">7</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">UnsafeAppend</span><span class="p">(</span><span class="mi">8</span><span class="p">);</span> |
| |
| <span class="k">auto</span><span class="w"> </span><span class="n">maybe_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">builder</span><span class="p">.</span><span class="n">Finish</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| </section> |
| </section> |
| <section id="size-limitations-and-recommendations"> |
| <h2>Size Limitations and Recommendations<a class="headerlink" href="#size-limitations-and-recommendations" title="Permalink to this heading">¶</a></h2> |
| <p>Some array types are structurally limited to 32-bit sizes. This is the case |
| for list arrays (which can hold up to 2^31 elements), string arrays and binary |
| arrays (which can hold up to 2GB of binary data), at least. Some other array |
| types can hold up to 2^63 elements in the C++ implementation, but other Arrow |
| implementations can have a 32-bit size limitation for those array types as well.</p> |
| <p>For these reasons, it is recommended that huge data be chunked in subsets of |
| more reasonable size.</p> |
| </section> |
| <section id="chunked-arrays"> |
| <h2>Chunked Arrays<a class="headerlink" href="#chunked-arrays" title="Permalink to this heading">¶</a></h2> |
| <p>A <a class="reference internal" href="api/array.html#_CPPv4N5arrow12ChunkedArrayE" title="arrow::ChunkedArray"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::ChunkedArray</span></code></a> is, like an array, a logical sequence of values; |
| but unlike a simple array, a chunked array does not require the entire sequence |
| to be physically contiguous in memory. Also, the constituents of a chunked array |
| need not have the same size, but they must all have the same data type.</p> |
| <p>A chunked array is constructed by aggregating any number of arrays. Here we’ll |
| build a chunked array with the same logical values as in the example above, |
| but in two separate chunks:</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">shared_ptr</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">Array</span><span class="o">>></span><span class="w"> </span><span class="n">chunks</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">arrow</span><span class="o">::</span><span class="n">Array</span><span class="o">></span><span class="w"> </span><span class="n">array</span><span class="p">;</span> |
| |
| <span class="c1">// Build first chunk</span> |
| <span class="n">arrow</span><span class="o">::</span><span class="n">Int64Builder</span><span class="w"> </span><span class="n">builder</span><span class="p">;</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">2</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">3</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">builder</span><span class="p">.</span><span class="n">Finish</span><span class="p">(</span><span class="o">&</span><span class="n">array</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">// ... do something on array building failure</span> |
| <span class="p">}</span> |
| <span class="n">chunks</span><span class="p">.</span><span class="n">push_back</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">array</span><span class="p">));</span> |
| |
| <span class="c1">// Build second chunk</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Reset</span><span class="p">();</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">AppendNull</span><span class="p">();</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">7</span><span class="p">);</span> |
| <span class="n">builder</span><span class="p">.</span><span class="n">Append</span><span class="p">(</span><span class="mi">8</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">builder</span><span class="p">.</span><span class="n">Finish</span><span class="p">(</span><span class="o">&</span><span class="n">array</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">// ... do something on array building failure</span> |
| <span class="p">}</span> |
| <span class="n">chunks</span><span class="p">.</span><span class="n">push_back</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">array</span><span class="p">));</span> |
| |
| <span class="k">auto</span><span class="w"> </span><span class="n">chunked_array</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">make_shared</span><span class="o"><</span><span class="n">arrow</span><span class="o">::</span><span class="n">ChunkedArray</span><span class="o">></span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">move</span><span class="p">(</span><span class="n">chunks</span><span class="p">));</span> |
| |
| <span class="n">assert</span><span class="p">(</span><span class="n">chunked_array</span><span class="o">-></span><span class="n">num_chunks</span><span class="p">()</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">2</span><span class="p">);</span> |
| <span class="c1">// Logical length in number of values</span> |
| <span class="n">assert</span><span class="p">(</span><span class="n">chunked_array</span><span class="o">-></span><span class="n">length</span><span class="p">()</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">8</span><span class="p">);</span> |
| <span class="n">assert</span><span class="p">(</span><span class="n">chunked_array</span><span class="o">-></span><span class="n">null_count</span><span class="p">()</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="slicing"> |
| <h2>Slicing<a class="headerlink" href="#slicing" title="Permalink to this heading">¶</a></h2> |
| <p>Like for physical memory buffers, it is possible to make zero-copy slices |
| of arrays and chunked arrays, to obtain an array or chunked array referring |
| to some logical subsequence of the data. This is done by calling the |
| <a class="reference internal" href="api/array.html#_CPPv4NK5arrow5Array5SliceE7int64_t7int64_t" title="arrow::Array::Slice"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::Array::Slice()</span></code></a> and <a class="reference internal" href="api/array.html#_CPPv4NK5arrow12ChunkedArray5SliceE7int64_t7int64_t" title="arrow::ChunkedArray::Slice"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::ChunkedArray::Slice()</span></code></a> methods, |
| respectively.</p> |
| </section> |
| </section> |
| |
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