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| <h2> |
| Algebra builder |
| <a href="/news/2015/06/05/algebra-builder/" class="permalink" title="Permalink">∞</a> |
| </h2> |
| <span class="post-category"> |
| <span class="label"> |
| new features |
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| <div class="post-meta"> |
| <span class="post-date"> |
| 05 Jun 2015 |
| </span> |
| |
| |
| |
| <a href="http://people.apache.org/~jhyde" class="post-author"> |
| <img src="http://github.com/julianhyde.png" |
| class="avatar" alt="jhyde avatar" |
| width="24" height="24"> |
| jhyde |
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| <div class="post-content"> |
| <!-- |
| |
| --> |
| |
| <p>Calcite’s foundation is a comprehensive implementation of relational |
| algebra (together with transformation rules, cost model, and metadata) |
| but to create algebra expressions you had to master a complex API.</p> |
| |
| <p>We’re solving this problem by introducing an |
| <a href="/apidocs/org/apache/calcite/tools/RelBuilder.html">algebra builder</a>, |
| a single class with all the methods you need to build any relational |
| expression.</p> |
| |
| <p>For example,</p> |
| |
| <figure class="highlight"><pre><code class="language-java" data-lang="java"><span class="kd">final</span> <span class="n">FrameworkConfig</span> <span class="n">config</span><span class="o">;</span> |
| <span class="kd">final</span> <span class="n">RelBuilder</span> <span class="n">builder</span> <span class="o">=</span> <span class="n">RelBuilder</span><span class="o">.</span><span class="na">create</span><span class="o">(</span><span class="n">config</span><span class="o">);</span> |
| <span class="kd">final</span> <span class="n">RelNode</span> <span class="n">node</span> <span class="o">=</span> <span class="n">builder</span> |
| <span class="o">.</span><span class="na">scan</span><span class="o">(</span><span class="s">"EMP"</span><span class="o">)</span> |
| <span class="o">.</span><span class="na">aggregate</span><span class="o">(</span><span class="n">builder</span><span class="o">.</span><span class="na">groupKey</span><span class="o">(</span><span class="s">"DEPTNO"</span><span class="o">),</span> |
| <span class="n">builder</span><span class="o">.</span><span class="na">count</span><span class="o">(</span><span class="kc">false</span><span class="o">,</span> <span class="s">"C"</span><span class="o">),</span> |
| <span class="n">builder</span><span class="o">.</span><span class="na">sum</span><span class="o">(</span><span class="kc">false</span><span class="o">,</span> <span class="s">"S"</span><span class="o">,</span> <span class="n">builder</span><span class="o">.</span><span class="na">field</span><span class="o">(</span><span class="s">"SAL"</span><span class="o">)))</span> |
| <span class="o">.</span><span class="na">filter</span><span class="o">(</span> |
| <span class="n">builder</span><span class="o">.</span><span class="na">call</span><span class="o">(</span><span class="n">SqlStdOperatorTable</span><span class="o">.</span><span class="na">GREATER_THAN</span><span class="o">,</span> |
| <span class="n">builder</span><span class="o">.</span><span class="na">field</span><span class="o">(</span><span class="s">"C"</span><span class="o">),</span> |
| <span class="n">builder</span><span class="o">.</span><span class="na">literal</span><span class="o">(</span><span class="mi">10</span><span class="o">)))</span> |
| <span class="o">.</span><span class="na">build</span><span class="o">();</span> |
| <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">RelOptUtil</span><span class="o">.</span><span class="na">toString</span><span class="o">(</span><span class="n">node</span><span class="o">));</span></code></pre></figure> |
| |
| <p>creates the algebra</p> |
| |
| <figure class="highlight"><pre><code class="language-text" data-lang="text">LogicalFilter(condition=[>($1, 10)]) |
| LogicalAggregate(group=[{7}], C=[COUNT()], S=[SUM($5)]) |
| LogicalTableScan(table=[[scott, EMP]])</code></pre></figure> |
| |
| <p>which is equivalent to the SQL</p> |
| |
| <figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="k">SELECT</span> <span class="n">deptno</span><span class="p">,</span> <span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">)</span> <span class="k">AS</span> <span class="k">c</span><span class="p">,</span> <span class="k">sum</span><span class="p">(</span><span class="n">sal</span><span class="p">)</span> <span class="k">AS</span> <span class="n">s</span> |
| <span class="k">FROM</span> <span class="n">emp</span> |
| <span class="k">GROUP</span> <span class="k">BY</span> <span class="n">deptno</span> |
| <span class="k">HAVING</span> <span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">)</span> <span class="o">></span> <span class="mi">10</span></code></pre></figure> |
| |
| <p>The <a href="/docs/algebra.html">algebra builder documentation</a> describes the |
| full API and has lots of examples.</p> |
| |
| <p>We’re still working on the algebra builder, but plan to release it |
| with Calcite 1.4 (see |
| [<a href="https://issues.apache.org/jira/browse/CALCITE-748">CALCITE-748</a>]).</p> |
| |
| <p>The algebra builder will make some existing tasks easier (such as |
| writing planner rules), but will also enable new things, such as |
| writing applications directly on top of Calcite, or implementing |
| non-SQL query languages. These applications and languages will be able |
| to take advantage of Calcite’s existing back-ends (including |
| Hive-on-Tez, Drill, MongoDB, Splunk, Spark, JDBC data sources) and |
| extensive set of query-optimization rules.</p> |
| |
| <p>If you have questions or comments, please post to the |
| <a href="/develop">mailing list</a>.</p> |
| |
| |
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| <a href="/news/2016/02/17/streaming-sql-talk/">Streaming SQL in Samza</a> |
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| <a href="/news/2016/02/17/elser-pmc/">Calcite appoints Josh Elser to PMC</a> |
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| <a href="/news/2015/11/08/new-committers/">Calcite adds 2 committers</a> |
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| <a href="/news/2015/07/31/xldb-best-lightning-talk/">XLDB 2015 best lightning talk</a> |
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| <a href="/news/2015/06/05/algebra-builder/">Algebra builder</a> |
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