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| |
| <div class="section" id="streaming-execution-engine"> |
| <h1>Streaming execution engine<a class="headerlink" href="#streaming-execution-engine" title="Permalink to this headline">¶</a></h1> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>The streaming execution engine is experimental, and a stable API |
| is not yet guaranteed.</p> |
| </div> |
| <div class="section" id="motivation"> |
| <h2>Motivation<a class="headerlink" href="#motivation" title="Permalink to this headline">¶</a></h2> |
| <p>For many complex computations, successive direct <a class="reference internal" href="compute.html#invoking-compute-functions"><span class="std std-ref">invocation of |
| compute functions</span></a> is not feasible |
| in either memory or computation time. Doing so causes all intermediate |
| data to be fully materialized. To facilitate arbitrarily large inputs |
| and more efficient resource usage, Arrow also provides a streaming query |
| engine with which computations can be formulated and executed.</p> |
| <img alt="An example graph of a streaming execution workflow." src="../_images/simple_graph.svg" /><p><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> is provided to reify the graph of operations in a query. |
| Batches of data (<code class="xref cpp cpp-struct docutils literal notranslate"><span class="pre">ExecBatch</span></code>) flow along edges of the graph from |
| node to node. Structuring the API around streams of batches allows the |
| working set for each node to be tuned for optimal performance independent |
| of any other nodes in the graph. Each <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> processes batches |
| as they are pushed to it along an edge of the graph by upstream nodes |
| (its inputs), and pushes batches along an edge of the graph to downstream |
| nodes (its outputs) as they are finalized.</p> |
| <p>..seealso:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span>`SHAIKHHA, A., DASHTI, M., & KOCH, C. |
| (2018). Push versus pull-based loop fusion in query engines. |
| Journal of Functional Programming, 28. |
| <https://doi.org/10.1017/s0956796818000102>`_ |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="overview"> |
| <h2>Overview<a class="headerlink" href="#overview" title="Permalink to this headline">¶</a></h2> |
| <dl class="simple"> |
| <dt><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code></dt><dd><p>Each node in the graph is an implementation of the <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> interface.</p> |
| </dd> |
| <dt><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code></dt><dd><p>A set of <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> is contained and (to an extent) coordinated by an |
| <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code>.</p> |
| </dd> |
| <dt><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecFactoryRegistry</span></code></dt><dd><p>Instances of <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> are constructed by factory functions held |
| in a <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecFactoryRegistry</span></code>.</p> |
| </dd> |
| <dt><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNodeOptions</span></code></dt><dd><p>Heterogenous parameters for factories of <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> are bundled in an |
| <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNodeOptions</span></code>.</p> |
| </dd> |
| <dt><code class="xref cpp cpp-struct docutils literal notranslate"><span class="pre">Declaration</span></code></dt><dd><p><code class="docutils literal notranslate"><span class="pre">dplyr</span></code>-inspired helper for efficient construction of an <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code>.</p> |
| </dd> |
| <dt><code class="xref cpp cpp-struct docutils literal notranslate"><span class="pre">ExecBatch</span></code></dt><dd><p>A lightweight container for a single chunk of data in the Arrow format. In |
| contrast to <a class="reference internal" href="api/table.html#_CPPv4N5arrow11RecordBatchE" title="arrow::RecordBatch"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RecordBatch</span></code></a>, <code class="xref cpp cpp-struct docutils literal notranslate"><span class="pre">ExecBatch</span></code> is intended for use |
| exclusively in a streaming execution context (for example, it doesn’t have a |
| corresponding Python binding). Furthermore columns which happen to have a |
| constant value may be represented by a <a class="reference internal" href="api/scalar.html#_CPPv4N5arrow6ScalarE" title="arrow::Scalar"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">Scalar</span></code></a> instead of an |
| <a class="reference internal" href="api/array.html#_CPPv4N5arrow5ArrayE" title="arrow::Array"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">Array</span></code></a>. In addition, <code class="xref cpp cpp-struct docutils literal notranslate"><span class="pre">ExecBatch</span></code> may carry |
| execution-relevant properties including a guaranteed-true-filter |
| for <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">Expression</span></code> simplification.</p> |
| </dd> |
| </dl> |
| <p>An example <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> implementation which simply passes all input batches |
| through unchanged:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">PassthruNode</span> <span class="o">:</span> <span class="k">public</span> <span class="n">ExecNode</span> <span class="p">{</span> |
| <span class="k">public</span><span class="o">:</span> |
| <span class="c1">// InputReceived is the main entry point for ExecNodes. It is invoked</span> |
| <span class="c1">// by an input of this node to push a batch here for processing.</span> |
| <span class="kt">void</span> <span class="n">InputReceived</span><span class="p">(</span><span class="n">ExecNode</span><span class="o">*</span> <span class="n">input</span><span class="p">,</span> <span class="n">ExecBatch</span> <span class="n">batch</span><span class="p">)</span> <span class="k">override</span> <span class="p">{</span> |
| <span class="c1">// Since this is a passthru node we simply push the batch to our</span> |
| <span class="c1">// only output here.</span> |
| <span class="n">outputs_</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-></span><span class="n">InputReceived</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="n">batch</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="c1">// ErrorReceived is called by an input of this node to report an error.</span> |
| <span class="c1">// ExecNodes should always forward errors to their outputs unless they</span> |
| <span class="c1">// are able to fully handle the error (this is rare).</span> |
| <span class="kt">void</span> <span class="n">ErrorReceived</span><span class="p">(</span><span class="n">ExecNode</span><span class="o">*</span> <span class="n">input</span><span class="p">,</span> <span class="n">Status</span> <span class="n">error</span><span class="p">)</span> <span class="k">override</span> <span class="p">{</span> |
| <span class="n">outputs_</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-></span><span class="n">ErrorReceived</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="n">error</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="c1">// InputFinished is used to signal how many batches will ultimately arrive.</span> |
| <span class="c1">// It may be called with any ordering relative to InputReceived/ErrorReceived.</span> |
| <span class="kt">void</span> <span class="n">InputFinished</span><span class="p">(</span><span class="n">ExecNode</span><span class="o">*</span> <span class="n">input</span><span class="p">,</span> <span class="kt">int</span> <span class="n">total_batches</span><span class="p">)</span> <span class="k">override</span> <span class="p">{</span> |
| <span class="n">outputs_</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-></span><span class="n">InputFinished</span><span class="p">(</span><span class="k">this</span><span class="p">,</span> <span class="n">total_batches</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="c1">// ExecNodes may request that their inputs throttle production of batches</span> |
| <span class="c1">// until they are ready for more, or stop production if no further batches</span> |
| <span class="c1">// are required. These signals should typically be forwarded to the inputs</span> |
| <span class="c1">// of the ExecNode.</span> |
| <span class="kt">void</span> <span class="n">ResumeProducing</span><span class="p">(</span><span class="n">ExecNode</span><span class="o">*</span> <span class="n">output</span><span class="p">)</span> <span class="k">override</span> <span class="p">{</span> <span class="n">inputs_</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-></span><span class="n">ResumeProducing</span><span class="p">(</span><span class="k">this</span><span class="p">);</span> <span class="p">}</span> |
| <span class="kt">void</span> <span class="n">PauseProducing</span><span class="p">(</span><span class="n">ExecNode</span><span class="o">*</span> <span class="n">output</span><span class="p">)</span> <span class="k">override</span> <span class="p">{</span> <span class="n">inputs_</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-></span><span class="n">PauseProducing</span><span class="p">(</span><span class="k">this</span><span class="p">);</span> <span class="p">}</span> |
| <span class="kt">void</span> <span class="n">StopProducing</span><span class="p">(</span><span class="n">ExecNode</span><span class="o">*</span> <span class="n">output</span><span class="p">)</span> <span class="k">override</span> <span class="p">{</span> <span class="n">inputs_</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-></span><span class="n">StopProducing</span><span class="p">(</span><span class="k">this</span><span class="p">);</span> <span class="p">}</span> |
| |
| <span class="c1">// An ExecNode has a single output schema to which all its batches conform.</span> |
| <span class="k">using</span> <span class="n">ExecNode</span><span class="o">::</span><span class="n">output_schema</span><span class="p">;</span> |
| |
| <span class="c1">// ExecNodes carry basic introspection for debugging purposes</span> |
| <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="nf">kind_name</span><span class="p">()</span> <span class="k">const</span> <span class="k">override</span> <span class="p">{</span> <span class="k">return</span> <span class="s">"PassthruNode"</span><span class="p">;</span> <span class="p">}</span> |
| <span class="k">using</span> <span class="n">ExecNode</span><span class="o">::</span><span class="n">label</span><span class="p">;</span> |
| <span class="k">using</span> <span class="n">ExecNode</span><span class="o">::</span><span class="n">SetLabel</span><span class="p">;</span> |
| <span class="k">using</span> <span class="n">ExecNode</span><span class="o">::</span><span class="n">ToString</span><span class="p">;</span> |
| |
| <span class="c1">// An ExecNode holds references to its inputs and outputs, so it is possible</span> |
| <span class="c1">// to walk the graph of execution if necessary.</span> |
| <span class="k">using</span> <span class="n">ExecNode</span><span class="o">::</span><span class="n">inputs</span><span class="p">;</span> |
| <span class="k">using</span> <span class="n">ExecNode</span><span class="o">::</span><span class="n">outputs</span><span class="p">;</span> |
| |
| <span class="c1">// StartProducing() and StopProducing() are invoked by an ExecPlan to</span> |
| <span class="c1">// coordinate the graph-wide execution state. These do not need to be</span> |
| <span class="c1">// forwarded to inputs or outputs.</span> |
| <span class="n">Status</span> <span class="nf">StartProducing</span><span class="p">()</span> <span class="k">override</span> <span class="p">{</span> <span class="k">return</span> <span class="n">Status</span><span class="o">::</span><span class="n">OK</span><span class="p">();</span> <span class="p">}</span> |
| <span class="kt">void</span> <span class="nf">StopProducing</span><span class="p">()</span> <span class="k">override</span> <span class="p">{}</span> |
| <span class="n">Future</span><span class="o"><></span> <span class="n">finished</span><span class="p">()</span> <span class="k">override</span> <span class="p">{</span> <span class="k">return</span> <span class="n">inputs_</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-></span><span class="n">finished</span><span class="p">();</span> <span class="p">}</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| <p>Note that each method which is associated with an edge of the graph must be invoked |
| with an <code class="docutils literal notranslate"><span class="pre">ExecNode*</span></code> to identify the node which invoked it. For example, in an |
| <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> which implements <code class="docutils literal notranslate"><span class="pre">JOIN</span></code> this tagging might be used to differentiate |
| between batches from the left or right inputs. |
| <code class="docutils literal notranslate"><span class="pre">InputReceived</span></code>, <code class="docutils literal notranslate"><span class="pre">ErrorReceived</span></code>, <code class="docutils literal notranslate"><span class="pre">InputFinished</span></code> may only be invoked by |
| the inputs of a node, while <code class="docutils literal notranslate"><span class="pre">ResumeProducing</span></code>, <code class="docutils literal notranslate"><span class="pre">PauseProducing</span></code>, <code class="docutils literal notranslate"><span class="pre">StopProducing</span></code> |
| may only be invoked by outputs of a node.</p> |
| <p><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code> contains the associated instances of <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> |
| and is used to start and stop execution of all nodes and for querying/awaiting |
| their completion:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// construct an ExecPlan first to hold your nodes</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="k">auto</span> <span class="n">plan</span><span class="p">,</span> <span class="n">ExecPlan</span><span class="o">::</span><span class="n">Make</span><span class="p">(</span><span class="n">default_exec_context</span><span class="p">()));</span> |
| |
| <span class="c1">// ... add nodes to your ExecPlan</span> |
| |
| <span class="c1">// start all nodes in the graph</span> |
| <span class="n">ARROW_RETURN_NOT_OK</span><span class="p">(</span><span class="n">plan</span><span class="o">-></span><span class="n">StartProducing</span><span class="p">());</span> |
| |
| <span class="n">SetUserCancellationCallback</span><span class="p">([</span><span class="n">plan</span><span class="p">]</span> <span class="p">{</span> |
| <span class="c1">// stop all nodes in the graph</span> |
| <span class="n">plan</span><span class="o">-></span><span class="n">StopProducing</span><span class="p">();</span> |
| <span class="p">});</span> |
| |
| <span class="c1">// Complete will be marked finished when all nodes have run to completion</span> |
| <span class="c1">// or acknowledged a StopProducing() signal. The ExecPlan should be kept</span> |
| <span class="c1">// alive until this future is marked finished.</span> |
| <span class="n">Future</span><span class="o"><></span> <span class="n">complete</span> <span class="o">=</span> <span class="n">plan</span><span class="o">-></span><span class="n">finished</span><span class="p">();</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="constructing-execplan-objects"> |
| <h2>Constructing <code class="docutils literal notranslate"><span class="pre">ExecPlan</span></code> objects<a class="headerlink" href="#constructing-execplan-objects" title="Permalink to this headline">¶</a></h2> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>The following will be superceded by construction from Compute IR, see ARROW-14074.</p> |
| </div> |
| <p>None of the concrete implementations of <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> are exposed |
| in headers, so they can’t be constructed directly outside the |
| translation unit where they are defined. Instead, factories to |
| create them are provided in an extensible registry. This structure |
| provides a number of benefits:</p> |
| <ul class="simple"> |
| <li><p>This enforces consistent construction.</p></li> |
| <li><p>It decouples implementations from consumers of the interface |
| (for example: we have two classes for scalar and grouped aggregate, |
| we can choose which to construct within the single factory by |
| checking whether grouping keys are provided)</p></li> |
| <li><p>This expedites integration with out-of-library extensions. For example |
| “scan” nodes are implemented in the separate <code class="docutils literal notranslate"><span class="pre">libarrow_dataset.so</span></code> library.</p></li> |
| <li><p>Since the class is not referencable outside the translation unit in which it |
| is defined, compilers can optimize more aggressively.</p></li> |
| </ul> |
| <p>Factories of <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecNode</span></code> can be retrieved by name from the registry. |
| The default registry is available through |
| <code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">arrow::compute::default_exec_factory_registry()</span></code> |
| and can be queried for the built-in factories:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="c1">// get the factory for "filter" nodes:</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="k">auto</span> <span class="n">make_filter</span><span class="p">,</span> |
| <span class="n">default_exec_factory_registry</span><span class="p">()</span><span class="o">-></span><span class="n">GetFactory</span><span class="p">(</span><span class="s">"filter"</span><span class="p">));</span> |
| |
| <span class="c1">// factories take three arguments:</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">ExecNode</span><span class="o">*</span> <span class="n">filter_node</span><span class="p">,</span> <span class="o">*</span><span class="n">make_filter</span><span class="p">(</span> |
| <span class="c1">// the ExecPlan which should own this node</span> |
| <span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span> |
| |
| <span class="c1">// nodes which will send batches to this node (inputs)</span> |
| <span class="p">{</span><span class="n">scan_node</span><span class="p">},</span> |
| |
| <span class="c1">// parameters unique to "filter" nodes</span> |
| <span class="n">FilterNodeOptions</span><span class="p">{</span><span class="n">filter_expression</span><span class="p">}));</span> |
| |
| <span class="c1">// alternative shorthand:</span> |
| <span class="n">ARROW_ASSIGN_OR_RAISE</span><span class="p">(</span><span class="n">filter_node</span><span class="p">,</span> <span class="n">MakeExecNode</span><span class="p">(</span><span class="s">"filter"</span><span class="p">,</span> |
| <span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span> <span class="p">{</span><span class="n">scan_node</span><span class="p">},</span> <span class="n">FilterNodeOptions</span><span class="p">{</span><span class="n">filter_expression</span><span class="p">});</span> |
| </pre></div> |
| </div> |
| <p>Factories can also be added to the default registry as long as they are |
| convertible to <code class="docutils literal notranslate"><span class="pre">std::function<Result<ExecNode*>(</span> |
| <span class="pre">ExecPlan*,</span> <span class="pre">std::vector<ExecNode*>,</span> <span class="pre">const</span> <span class="pre">ExecNodeOptions&)></span></code>.</p> |
| <p>To build an <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code> representing a simple pipeline which |
| reads from a <a class="reference internal" href="api/table.html#_CPPv4N5arrow17RecordBatchReaderE" title="arrow::RecordBatchReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RecordBatchReader</span></code></a> then filters, projects, and |
| writes to disk:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">std</span><span class="o">::</span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">RecordBatchReader</span><span class="o">></span> <span class="n">reader</span> <span class="o">=</span> <span class="n">GetStreamOfBatches</span><span class="p">();</span> |
| <span class="n">ExecNode</span><span class="o">*</span> <span class="n">source_node</span> <span class="o">=</span> <span class="o">*</span><span class="n">MakeExecNode</span><span class="p">(</span><span class="s">"source"</span><span class="p">,</span> <span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span> <span class="p">{},</span> |
| <span class="n">SourceNodeOptions</span><span class="o">::</span><span class="n">FromReader</span><span class="p">(</span> |
| <span class="n">reader</span><span class="p">,</span> |
| <span class="n">GetCpuThreadPool</span><span class="p">()));</span> |
| |
| <span class="n">ExecNode</span><span class="o">*</span> <span class="n">filter_node</span> <span class="o">=</span> <span class="o">*</span><span class="n">MakeExecNode</span><span class="p">(</span><span class="s">"filter"</span><span class="p">,</span> <span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span> <span class="p">{</span><span class="n">source_node</span><span class="p">},</span> |
| <span class="n">FilterNodeOptions</span><span class="p">{</span> |
| <span class="n">greater</span><span class="p">(</span><span class="n">field_ref</span><span class="p">(</span><span class="s">"score"</span><span class="p">),</span> <span class="n">literal</span><span class="p">(</span><span class="mi">3</span><span class="p">))</span> |
| <span class="p">});</span> |
| |
| <span class="n">ExecNode</span><span class="o">*</span> <span class="n">project_node</span> <span class="o">=</span> <span class="o">*</span><span class="n">MakeExecNode</span><span class="p">(</span><span class="s">"project"</span><span class="p">,</span> <span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span> <span class="p">{</span><span class="n">filter_node</span><span class="p">},</span> |
| <span class="n">ProjectNodeOptions</span><span class="p">{</span> |
| <span class="p">{</span><span class="n">add</span><span class="p">(</span><span class="n">field_ref</span><span class="p">(</span><span class="s">"score"</span><span class="p">),</span> <span class="n">literal</span><span class="p">(</span><span class="mi">1</span><span class="p">))},</span> |
| <span class="p">{</span><span class="s">"score + 1"</span><span class="p">}</span> |
| <span class="p">});</span> |
| |
| <span class="n">arrow</span><span class="o">::</span><span class="n">dataset</span><span class="o">::</span><span class="n">internal</span><span class="o">::</span><span class="n">Initialize</span><span class="p">();</span> |
| <span class="n">MakeExecNode</span><span class="p">(</span><span class="s">"write"</span><span class="p">,</span> <span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">(),</span> <span class="p">{</span><span class="n">project_node</span><span class="p">},</span> |
| <span class="n">WriteNodeOptions</span><span class="p">{</span><span class="cm">/*base_dir=*/</span><span class="s">"/dat"</span><span class="p">,</span> <span class="cm">/*...*/</span><span class="p">});</span> |
| </pre></div> |
| </div> |
| <p><code class="xref cpp cpp-struct docutils literal notranslate"><span class="pre">Declaration</span></code> is a <a class="reference external" href="https://dplyr.tidyverse.org">dplyr</a>-inspired |
| helper which further decreases the boilerplate associated with populating |
| an <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code> from C++:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">arrow</span><span class="o">::</span><span class="n">dataset</span><span class="o">::</span><span class="n">internal</span><span class="o">::</span><span class="n">Initialize</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">RecordBatchReader</span><span class="o">></span> <span class="n">reader</span> <span class="o">=</span> <span class="n">GetStreamOfBatches</span><span class="p">();</span> |
| <span class="n">ASSERT_OK</span><span class="p">(</span><span class="n">Declaration</span><span class="o">::</span><span class="n">Sequence</span><span class="p">(</span> |
| <span class="p">{</span> |
| <span class="p">{</span><span class="s">"source"</span><span class="p">,</span> <span class="n">SourceNodeOptions</span><span class="o">::</span><span class="n">FromReader</span><span class="p">(</span> |
| <span class="n">reader</span><span class="p">,</span> |
| <span class="n">GetCpuThreadPool</span><span class="p">())},</span> |
| <span class="p">{</span><span class="s">"filter"</span><span class="p">,</span> <span class="n">FilterNodeOptions</span><span class="p">{</span> |
| <span class="n">greater</span><span class="p">(</span><span class="n">field_ref</span><span class="p">(</span><span class="s">"score"</span><span class="p">),</span> <span class="n">literal</span><span class="p">(</span><span class="mi">3</span><span class="p">))}},</span> |
| <span class="p">{</span><span class="s">"project"</span><span class="p">,</span> <span class="n">ProjectNodeOptions</span><span class="p">{</span> |
| <span class="p">{</span><span class="n">add</span><span class="p">(</span><span class="n">field_ref</span><span class="p">(</span><span class="s">"score"</span><span class="p">),</span> <span class="n">literal</span><span class="p">(</span><span class="mi">1</span><span class="p">))},</span> |
| <span class="p">{</span><span class="s">"score + 1"</span><span class="p">}}},</span> |
| <span class="p">{</span><span class="s">"write"</span><span class="p">,</span> <span class="n">WriteNodeOptions</span><span class="p">{</span><span class="cm">/*base_dir=*/</span><span class="s">"/dat"</span><span class="p">,</span> <span class="cm">/*...*/</span><span class="p">}},</span> |
| <span class="p">})</span> |
| <span class="p">.</span><span class="n">AddToPlan</span><span class="p">(</span><span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">()));</span> |
| </pre></div> |
| </div> |
| <p>Note that a source node can wrap anything which resembles a stream of batches. |
| For example, <a class="reference external" href="https://github.com/apache/arrow/pull/11032">PR#11032</a> adds |
| support for use of a <a class="reference external" href="https://duckdb.org">DuckDB</a> query as a source node. |
| Similarly, a sink node can wrap anything which absorbs a stream of batches. |
| In the example above we’re writing completed |
| batches to disk. However we can also collect these in memory into a <a class="reference internal" href="api/table.html#_CPPv4N5arrow5TableE" title="arrow::Table"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">Table</span></code></a> |
| or forward them to a <a class="reference internal" href="api/table.html#_CPPv4N5arrow17RecordBatchReaderE" title="arrow::RecordBatchReader"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">RecordBatchReader</span></code></a> as an out-of-graph stream. |
| This flexibility allows an <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code> to be used as streaming middleware |
| between any endpoints which support Arrow formatted batches.</p> |
| <p>An <a class="reference internal" href="api/dataset.html#_CPPv4N5arrow7dataset7DatasetE" title="arrow::dataset::Dataset"><code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">arrow::dataset::Dataset</span></code></a> can also be wrapped as a source node which |
| pushes all the dataset’s batches into an <code class="xref cpp cpp-class docutils literal notranslate"><span class="pre">ExecPlan</span></code>. This factory is added |
| to the default registry with the name <code class="docutils literal notranslate"><span class="pre">"scan"</span></code> by calling |
| <code class="docutils literal notranslate"><span class="pre">arrow::dataset::internal::Initialize()</span></code>:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="n">arrow</span><span class="o">::</span><span class="n">dataset</span><span class="o">::</span><span class="n">internal</span><span class="o">::</span><span class="n">Initialize</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">Dataset</span><span class="o">></span> <span class="n">dataset</span> <span class="o">=</span> <span class="n">GetDataset</span><span class="p">();</span> |
| |
| <span class="n">ASSERT_OK</span><span class="p">(</span><span class="n">Declaration</span><span class="o">::</span><span class="n">Sequence</span><span class="p">(</span> |
| <span class="p">{</span> |
| <span class="p">{</span><span class="s">"scan"</span><span class="p">,</span> <span class="n">ScanNodeOptions</span><span class="p">{</span><span class="n">dataset</span><span class="p">,</span> |
| <span class="cm">/* push down predicate, projection, ... */</span><span class="p">}},</span> |
| <span class="p">{</span><span class="s">"filter"</span><span class="p">,</span> <span class="n">FilterNodeOptions</span><span class="p">{</span><span class="cm">/* ... */</span><span class="p">}},</span> |
| <span class="c1">// ...</span> |
| <span class="p">})</span> |
| <span class="p">.</span><span class="n">AddToPlan</span><span class="p">(</span><span class="n">plan</span><span class="p">.</span><span class="n">get</span><span class="p">()));</span> |
| </pre></div> |
| </div> |
| <p>Datasets may be scanned multiple times; just make multiple scan |
| nodes from that dataset. (Useful for a self-join, for example.) |
| Note that producing two scan nodes like this will perform all |
| reads and decodes twice.</p> |
| </div> |
| </div> |
| |
| |
| </div> |
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