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| <section id="module-apache_beam.testing.benchmarks.nexmark.queries.query4"> |
| <span id="apache-beam-testing-benchmarks-nexmark-queries-query4-module"></span><h1>apache_beam.testing.benchmarks.nexmark.queries.query4 module<a class="headerlink" href="#module-apache_beam.testing.benchmarks.nexmark.queries.query4" title="Link to this heading"></a></h1> |
| <p>Query 4, ‘Average Price for a Category’. Select the average of the wining bid |
| prices for all closed auctions in each category. In CQL syntax:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SELECT</span> <span class="n">Istream</span><span class="p">(</span><span class="n">AVG</span><span class="p">(</span><span class="n">Q</span><span class="o">.</span><span class="n">final</span><span class="p">))</span> |
| <span class="n">FROM</span> <span class="n">Category</span> <span class="n">C</span><span class="p">,</span> <span class="p">(</span><span class="n">SELECT</span> <span class="n">Rstream</span><span class="p">(</span><span class="n">MAX</span><span class="p">(</span><span class="n">B</span><span class="o">.</span><span class="n">price</span><span class="p">)</span> <span class="n">AS</span> <span class="n">final</span><span class="p">,</span> <span class="n">A</span><span class="o">.</span><span class="n">category</span><span class="p">)</span> |
| <span class="n">FROM</span> <span class="n">Auction</span> <span class="n">A</span> <span class="p">[</span><span class="n">ROWS</span> <span class="n">UNBOUNDED</span><span class="p">],</span> <span class="n">Bid</span> <span class="n">B</span> <span class="p">[</span><span class="n">ROWS</span> <span class="n">UNBOUNDED</span><span class="p">]</span> |
| <span class="n">WHERE</span> <span class="n">A</span><span class="o">.</span><span class="n">id</span><span class="o">=</span><span class="n">B</span><span class="o">.</span><span class="n">auction</span> |
| <span class="n">AND</span> <span class="n">B</span><span class="o">.</span><span class="n">datetime</span> <span class="o"><</span> <span class="n">A</span><span class="o">.</span><span class="n">expires</span> <span class="n">AND</span> <span class="n">A</span><span class="o">.</span><span class="n">expires</span> <span class="o"><</span> <span class="n">CURRENT_TIME</span> |
| <span class="n">GROUP</span> <span class="n">BY</span> <span class="n">A</span><span class="o">.</span><span class="n">id</span><span class="p">,</span> <span class="n">A</span><span class="o">.</span><span class="n">category</span><span class="p">)</span> <span class="n">Q</span> |
| <span class="n">WHERE</span> <span class="n">Q</span><span class="o">.</span><span class="n">category</span> <span class="o">=</span> <span class="n">C</span><span class="o">.</span><span class="n">id</span> |
| <span class="n">GROUP</span> <span class="n">BY</span> <span class="n">C</span><span class="o">.</span><span class="n">id</span><span class="p">;</span> |
| </pre></div> |
| </div> |
| <p>For extra spiciness our implementation differs slightly from the above:</p> |
| <ul class="simple"> |
| <li><p>We select both the average winning price and the category.</p></li> |
| <li><p>We don’t bother joining with a static category table, since it’s |
| contents are never used.</p></li> |
| <li><p>We only consider bids which are above the auction’s reserve price.</p></li> |
| <li><p>We accept the highest-price, earliest valid bid as the winner.</p></li> |
| <li><p>We calculate the averages oven a sliding window of size |
| window_size_sec and period window_period_sec.</p></li> |
| </ul> |
| <dl class="py function"> |
| <dt class="sig sig-object py" id="apache_beam.testing.benchmarks.nexmark.queries.query4.load"> |
| <span class="sig-prename descclassname"><span class="pre">apache_beam.testing.benchmarks.nexmark.queries.query4.</span></span><span class="sig-name descname"><span class="pre">load</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">events</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">metadata</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">pipeline_options</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/testing/benchmarks/nexmark/queries/query4.html#load"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#apache_beam.testing.benchmarks.nexmark.queries.query4.load" title="Link to this definition"></a></dt> |
| <dd></dd></dl> |
| |
| <dl class="py class"> |
| <dt class="sig sig-object py" id="apache_beam.testing.benchmarks.nexmark.queries.query4.ProjectToCategoryPriceFn"> |
| <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">apache_beam.testing.benchmarks.nexmark.queries.query4.</span></span><span class="sig-name descname"><span class="pre">ProjectToCategoryPriceFn</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">unused_args</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">unused_kwargs</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/testing/benchmarks/nexmark/queries/query4.html#ProjectToCategoryPriceFn"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#apache_beam.testing.benchmarks.nexmark.queries.query4.ProjectToCategoryPriceFn" title="Link to this definition"></a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.core.html#apache_beam.transforms.core.DoFn" title="apache_beam.transforms.core.DoFn"><code class="xref py py-class docutils literal notranslate"><span class="pre">DoFn</span></code></a></p> |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="apache_beam.testing.benchmarks.nexmark.queries.query4.ProjectToCategoryPriceFn.process"> |
| <span class="sig-name descname"><span class="pre">process</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">element</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">pane_info</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">PaneInfoParam</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/testing/benchmarks/nexmark/queries/query4.html#ProjectToCategoryPriceFn.process"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#apache_beam.testing.benchmarks.nexmark.queries.query4.ProjectToCategoryPriceFn.process" title="Link to this definition"></a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
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