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+            <a href="#"><i class="none"></i>AQL Allen's Relations Functions</a>
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+            <!-- ! Licensed to the Apache Software Foundation (ASF) under one
+ ! or more contributor license agreements.  See the NOTICE file
+ ! distributed with this work for additional information
+ ! regarding copyright ownership.  The ASF licenses this file
+ ! to you under the Apache License, Version 2.0 (the
+ ! "License"); you may not use this file except in compliance
+ ! with the License.  You may obtain a copy of the License at
+ !
+ !   http://www.apache.org/licenses/LICENSE-2.0
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+ ! "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ ! KIND, either express or implied.  See the License for the
+ ! specific language governing permissions and limitations
+ ! under the License.
+ ! --><h1>AsterixDB Temporal Functions: Allen&#x2019;s Relations</h1>
+<div class="section">
+<h2><a name="Table_of_Contents"></a><a name="toc" id="toc">Table of Contents</a></h2>
+
+<ul>
+  
+<li><a href="#AboutAllensRelations">About Allen&#x2019;s Relations</a></li>
+  
+<li><a href="#AllensRelatonsFunctions">Allen&#x2019;s Relations Functions</a></li>
+</ul></div>
+<div class="section">
+<h2><a name="About_Allens_Relations_Back_to_TOC"></a><a name="AboutAllensRelations" id="AboutAllensRelations">About Allen&#x2019;s Relations</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p>AsterixDB supports Allen&#x2019;s relations over interval types. Allen&#x2019;s relations are also called Allen&#x2019;s interval algebra. There are totally 13 base relations described by this algebra, and all of them are supported in AsterixDB (note that <tt>interval-equals</tt> is supported by the <tt>=</tt> comparison symbol so there is no extra function for it). </p>
+<p>A detailed description of Allen&#x2019;s relations can be found from its <a class="externalLink" href="http://en.wikipedia.org/wiki/Allen&apos;s_interval_algebra">wikipedia entry</a>. </p></div>
+<div class="section">
+<h2><a name="Allens_Relations_Functions_Back_to_TOC"></a><a name="AllensRelatonsFunctions" id="AllensRelatonsFunctions">Allen&#x2019;s Relations Functions</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<div class="section">
+<h3><a name="interval-before_interval-after"></a>interval-before, interval-after</h3>
+
+<ul>
+  
+<li>
+<p>Syntax:</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval-before(interval1, interval2)
+interval-after(interval1, interval2)
+</pre></div></div></li>
+  
+<li>
+<p>These two functions check whether an interval happens before/after another interval. </p></li>
+  
+<li>Arguments:
+  
+<ul>
+    
+<li><tt>interval1</tt>, <tt>interval2</tt>: two intervals to be compared</li>
+  </ul></li>
+  
+<li>
+<p>Return Value:</p>
+<p>A <tt>boolean</tt> value. Specifically, <tt>interval-before(interval1, interval2)</tt> is true if and only if <tt>interval1.end &lt; interval2.start</tt>, and <tt>interval-after(interval1, interval2)</tt> is true if and only if <tt>interval1.start &gt; interval2.end</tt>. If any of the two inputs is <tt>null</tt>, <tt>null</tt> is returned.</p></li>
+  
+<li>
+<p>Examples:</p>
+  
+<div class="source">
+<div class="source">
+<pre>let $itv1 := interval-from-date(&quot;2000-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv2 := interval-from-date(&quot;2005-05-01&quot;, &quot;2012-09-09&quot;)
+return {&quot;interval-before&quot;: interval-before($itv1, $itv2), &quot;interval-after&quot;: interval-after($itv2, $itv1)}
+</pre></div></div></li>
+  
+<li>
+<p>The expected result is:</p>
+  
+<div class="source">
+<div class="source">
+<pre>{ &quot;interval-before&quot;: true, &quot;interval-after&quot;: true }
+</pre></div></div></li>
+</ul></div>
+<div class="section">
+<h3><a name="interval-covers_interval-covered-by"></a>interval-covers, interval-covered-by</h3>
+
+<ul>
+  
+<li>
+<p>Syntax:</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval-covers(interval1, interval2)
+interval-covered-by(interval1, interval2)
+</pre></div></div></li>
+  
+<li>
+<p>These two functions check whether one interval covers the other interval.</p></li>
+  
+<li>Arguments:
+  
+<ul>
+    
+<li><tt>interval1</tt>, <tt>interval2</tt>: two intervals to be compared</li>
+  </ul></li>
+  
+<li>
+<p>Return Value:</p>
+<p>A <tt>boolean</tt> value. Specifically, <tt>interval-covers(interval1, interval2)</tt> is true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval1.start &lt;= interval2.start
+AND interval1.end &gt;= interval2.end
+</pre></div></div>
+<p><tt>interval-covered-by(interval1, interval2)</tt> is true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval2.start &lt;= interval1.start
+AND interval2.end &gt;= interval1.end
+</pre></div></div>
+<p>For both functions, if any of the two inputs is <tt>null</tt>, <tt>null</tt> is returned.</p></li>
+  
+<li>
+<p>Examples:</p>
+  
+<div class="source">
+<div class="source">
+<pre>let $itv1 := interval-from-date(&quot;2000-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv2 := interval-from-date(&quot;2000-03-01&quot;, &quot;2004-09-09&quot;)
+let $itv3 := interval-from-date(&quot;2006-08-01&quot;, &quot;2007-03-01&quot;)
+let $itv4 := interval-from-date(&quot;2004-09-10&quot;, &quot;2012-08-01&quot;)
+return {&quot;interval-covers&quot;: interval-covers($itv1, $itv2), &quot;interval-covered-by&quot;: interval-covered-by($itv3, $itv4)}
+</pre></div></div></li>
+  
+<li>
+<p>The expected result is:</p>
+  
+<div class="source">
+<div class="source">
+<pre>{ &quot;interval-covers&quot;: true, &quot;interval-covered-by&quot;: true }
+</pre></div></div></li>
+</ul></div>
+<div class="section">
+<h3><a name="interval-overlaps_interval-overlapped-by"></a>interval-overlaps, interval-overlapped-by</h3>
+
+<ul>
+  
+<li>
+<p>Syntax:</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval-overlaps(interval1, interval2)
+interval-overlapped-by(interval1, interval2)
+</pre></div></div></li>
+  
+<li>
+<p>These functions check whether two intervals overlap with each other.</p></li>
+  
+<li>Arguments:
+  
+<ul>
+    
+<li><tt>interval1</tt>, <tt>interval2</tt>: two intervals to be compared</li>
+  </ul></li>
+  
+<li>
+<p>Return Value:</p>
+<p>A <tt>boolean</tt> value. Specifically, <tt>interval-overlaps(interval1, interval2)</tt> is true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval1.start &lt; interval2.start
+AND interval2.end &gt; interval1.end
+AND interval1.end &gt; interval2.start
+</pre></div></div>
+<p><tt>interval-overlapped-by(interval1, interval2)</tt> is true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval2.start &lt; interval1.start
+AND interval1.end &gt; interval2.end
+AND interval2.end &gt; interval1.start
+</pre></div></div>
+<p>For all these functions, if any of the two inputs is <tt>null</tt>, <tt>null</tt> is returned.</p>
+<p>Note that <tt>interval-overlaps</tt> and <tt>interval-overlapped-by</tt> are following the Allen&#x2019;s relations on the definition of overlap.</p></li>
+  
+<li>
+<p>Examples:</p>
+  
+<div class="source">
+<div class="source">
+<pre>let $itv1 := interval-from-date(&quot;2000-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv2 := interval-from-date(&quot;2004-05-01&quot;, &quot;2012-09-09&quot;)
+let $itv3 := interval-from-date(&quot;2006-08-01&quot;, &quot;2007-03-01&quot;)
+let $itv4 := interval-from-date(&quot;2004-09-10&quot;, &quot;2006-12-31&quot;)
+return {&quot;overlaps&quot;: interval-overlaps($itv1, $itv2), 
+        &quot;overlapped-by&quot;: interval-overlapped-by($itv3, $itv4)}
+</pre></div></div></li>
+  
+<li>
+<p>The expected result is:</p>
+  
+<div class="source">
+<div class="source">
+<pre>{ &quot;overlaps&quot;: true, &quot;overlapped-by&quot;: true }
+</pre></div></div></li>
+</ul></div>
+<div class="section">
+<h3><a name="interval-overlapping"></a>interval-overlapping</h3>
+<p>Note that <tt>interval-overlapping</tt> is not an Allen&#x2019;s Relation, but syntactic sugar we added for the case that the intersect of two intervals is not empty. Basically this function returns true if any of these functions return true: <tt>interval-overlaps</tt>, <tt>interval-overlapped-by</tt>, <tt>interval-covers</tt>, or <tt>interval-covered-by</tt>.</p>
+
+<ul>
+  
+<li>
+<p>Syntax:</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval-overlapping(interval1, interval2)
+</pre></div></div></li>
+  
+<li>
+<p>This functions check whether two intervals share any points with each other. </p></li>
+  
+<li>Arguments:
+  
+<ul>
+    
+<li><tt>interval1</tt>, <tt>interval2</tt>: two intervals to be compared</li>
+  </ul></li>
+  
+<li>
+<p>Return Value:</p>
+<p>A <tt>boolean</tt> value. Specifically, <tt>interval-overlapping(interval1, interval2)</tt> is true if</p>
+  
+<div class="source">
+<div class="source">
+<pre>(interval2.start &gt;= interval1.start
+AND interval2.start &lt; interval1.end)
+OR
+(interval2.end &gt; interval1.start
+AND interval2.end &lt;= interval1.end)
+</pre></div></div>
+<p>If any of the two inputs is <tt>null</tt>, <tt>null</tt> is returned.</p></li>
+  
+<li>
+<p>Examples:</p>
+  
+<div class="source">
+<div class="source">
+<pre>let $itv1 := interval-from-date(&quot;2000-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv2 := interval-from-date(&quot;2004-05-01&quot;, &quot;2012-09-09&quot;)
+let $itv3 := interval-from-date(&quot;2006-08-01&quot;, &quot;2007-03-01&quot;)
+let $itv4 := interval-from-date(&quot;2004-09-10&quot;, &quot;2006-12-31&quot;)
+return {&quot;overlapping1&quot;: interval-overlapping($itv1, $itv2), 
+        &quot;overlapping2&quot;: interval-overlapping($itv3, $itv4)}
+</pre></div></div></li>
+  
+<li>
+<p>The expected result is:</p>
+  
+<div class="source">
+<div class="source">
+<pre>{ &quot;overlapping1&quot;: true, &quot;overlapping2&quot;: true }
+</pre></div></div></li>
+</ul></div>
+<div class="section">
+<h3><a name="interval-meets_interval-met-by"></a>interval-meets, interval-met-by</h3>
+
+<ul>
+  
+<li>
+<p>Syntax:</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval-meets(interval1, interval2)
+interval-met-by(interval1, interval2)
+</pre></div></div></li>
+  
+<li>
+<p>These two functions check whether an interval meets with another interval. </p></li>
+  
+<li>Arguments:
+  
+<ul>
+    
+<li><tt>interval1</tt>, <tt>interval2</tt>: two intervals to be compared</li>
+  </ul></li>
+  
+<li>
+<p>Return Value:</p>
+<p>A <tt>boolean</tt> value. Specifically, <tt>interval-meets(interval1, interval2)</tt> is true if and only if <tt>interval1.end = interval2.start</tt>, and <tt>interval-met-by(interval1, interval2)</tt> is true if and only if <tt>interval1.start = interval2.end</tt>. If any of the two inputs is <tt>null</tt>, <tt>null</tt> is returned.</p></li>
+  
+<li>
+<p>Examples:</p>
+  
+<div class="source">
+<div class="source">
+<pre>let $itv1 := interval-from-date(&quot;2000-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv2 := interval-from-date(&quot;2005-01-01&quot;, &quot;2012-09-09&quot;)
+let $itv3 := interval-from-date(&quot;2006-08-01&quot;, &quot;2007-03-01&quot;)
+let $itv4 := interval-from-date(&quot;2004-09-10&quot;, &quot;2006-08-01&quot;)
+return {&quot;meets&quot;: interval-meets($itv1, $itv2), &quot;metby&quot;: interval-met-by($itv3, $itv4)}
+</pre></div></div></li>
+  
+<li>
+<p>The expected result is:</p>
+  
+<div class="source">
+<div class="source">
+<pre>{ &quot;meets&quot;: true, &quot;metby&quot;: true }
+</pre></div></div></li>
+</ul></div>
+<div class="section">
+<h3><a name="interval-starts_interval-started-by"></a>interval-starts, interval-started-by</h3>
+
+<ul>
+  
+<li>
+<p>Syntax:</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval-starts(interval1, interval2)
+interval-started-by(interval1, interval2)
+</pre></div></div></li>
+  
+<li>
+<p>These two functions check whether one interval starts with the other interval.</p></li>
+  
+<li>Arguments:
+  
+<ul>
+    
+<li><tt>interval1</tt>, <tt>interval2</tt>: two intervals to be compared</li>
+  </ul></li>
+  
+<li>
+<p>Return Value:</p>
+<p>A <tt>boolean</tt> value. Specifically, <tt>interval-starts(interval1, interval2)</tt> returns true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval1.start = interval2.start
+AND interval1.end &lt;= interval2.end
+</pre></div></div>
+<p><tt>interval-started-by(interval1, interval2)</tt> returns true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval1.start = interval2.start
+AND interval2.end &lt;= interval1.end
+</pre></div></div>
+<p>For both functions, if any of the two inputs is <tt>null</tt>, <tt>null</tt> is returned.</p></li>
+  
+<li>
+<p>Examples:</p>
+  
+<div class="source">
+<div class="source">
+<pre>let $itv1 := interval-from-date(&quot;2000-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv2 := interval-from-date(&quot;2000-01-01&quot;, &quot;2012-09-09&quot;)
+let $itv3 := interval-from-date(&quot;2006-08-01&quot;, &quot;2007-03-01&quot;)
+let $itv4 := interval-from-date(&quot;2006-08-01&quot;, &quot;2006-08-01&quot;)
+return {&quot;interval-starts&quot;: interval-starts($itv1, $itv2), &quot;interval-started-by&quot;: interval-started-by($itv3, $itv4)}
+</pre></div></div></li>
+  
+<li>
+<p>The expected result is:</p>
+  
+<div class="source">
+<div class="source">
+<pre>{ &quot;interval-starts&quot;: true, &quot;interval-started-by&quot;: true }
+</pre></div></div></li>
+</ul></div>
+<div class="section">
+<h3><a name="interval-ends_interval-ended-by"></a>interval-ends, interval-ended-by</h3>
+
+<ul>
+  
+<li>
+<p>Syntax:</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval-ends(interval1, interval2)
+interval-ended-by(interval1, interval2)
+</pre></div></div></li>
+  
+<li>
+<p>These two functions check whether one interval ends with the other interval.</p></li>
+  
+<li>Arguments:
+  
+<ul>
+    
+<li><tt>interval1</tt>, <tt>interval2</tt>: two intervals to be compared</li>
+  </ul></li>
+  
+<li>
+<p>Return Value:</p>
+<p>A <tt>boolean</tt> value. Specifically, <tt>interval-ends(interval1, interval2)</tt> returns true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval1.end = interval2.end
+AND interval1.start &gt;= interval2.start
+</pre></div></div>
+<p><tt>interval-ended-by(interval1, interval2)</tt> returns true if and only if</p>
+  
+<div class="source">
+<div class="source">
+<pre>interval2.end = interval1.end
+AND interval2.start &gt;= interval1.start
+</pre></div></div>
+<p>For both functions, if any of the two inputs is <tt>null</tt>, <tt>null</tt> is returned.</p></li>
+  
+<li>
+<p>Examples:</p>
+  
+<div class="source">
+<div class="source">
+<pre>let $itv1 := interval-from-date(&quot;2000-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv2 := interval-from-date(&quot;1998-01-01&quot;, &quot;2005-01-01&quot;)
+let $itv3 := interval-from-date(&quot;2006-08-01&quot;, &quot;2007-03-01&quot;)
+let $itv4 := interval-from-date(&quot;2006-09-10&quot;, &quot;2007-03-01&quot;)
+return {&quot;interval-ends&quot;: interval-ends($itv1, $itv2), &quot;interval-ended-by&quot;: interval-ended-by($itv3, $itv4) }
+</pre></div></div></li>
+  
+<li>
+<p>The expected result is:</p>
+  
+<div class="source">
+<div class="source">
+<pre>{ &quot;interval-ends&quot;: true, &quot;interval-ended-by&quot;: true }
+</pre></div></div></li>
+</ul></div></div>
+                  </div>
+            </div>
+          </div>
+
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