Initial commit with Till's changes
diff --git a/aql/allens.html b/aql/allens.html
new file mode 100644
index 0000000..5cc7e1e
--- /dev/null
+++ b/aql/allens.html
@@ -0,0 +1,615 @@
+<!DOCTYPE html>
+<!--
+ | Generated by Apache Maven Doxia at 2015-05-29
+ | Rendered using Apache Maven Fluido Skin 1.3.0
+-->
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+ <head>
+ <meta charset="UTF-8" />
+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+ <meta name="Date-Revision-yyyymmdd" content="20150529" />
+ <meta http-equiv="Content-Language" content="en" />
+ <title>AsterixDB - </title>
+ <link rel="stylesheet" href="../css/apache-maven-fluido-1.3.0.min.css" />
+ <link rel="stylesheet" href="../css/site.css" />
+ <link rel="stylesheet" href="../css/print.css" media="print" />
+
+
+ <script type="text/javascript" src="../js/apache-maven-fluido-1.3.0.min.js"></script>
+
+
+ </head>
+ <body class="topBarDisabled">
+
+
+
+
+ <div class="container-fluid">
+ <div id="banner">
+ <div class="pull-left">
+ <a href=".././" id="bannerLeft">
+ <img src="../images/asterixlogo.png" alt="AsterixDB"/>
+ </a>
+ </div>
+ <div class="pull-right"> <a href="http://incubator.apache.org/" id="bannerRight">
+ <img src="../images/egg-logo.png" alt="Apache Software Foundation Incubator"/>
+ </a>
+ </div>
+ <div class="clear"><hr/></div>
+ </div>
+
+ <div id="breadcrumbs">
+ <ul class="breadcrumb">
+
+
+ <li id="publishDate">Last Published: 2015-05-29</li>
+
+
+
+ <li id="projectVersion" class="pull-right">Version: 0.8.7-SNAPSHOT</li>
+
+ <li class="divider pull-right">|</li>
+
+ <li class="pull-right"> <a href="../index.html" title="Home">
+ Home</a>
+ </li>
+
+ </ul>
+ </div>
+
+
+ <div class="row-fluid">
+ <div id="leftColumn" class="span3">
+ <div class="well sidebar-nav">
+
+
+ <ul class="nav nav-list">
+ <li class="nav-header">Apache Software Foundation</li>
+
+ <li>
+
+ <a href="http://www.apache.org/" class="externalLink" title="Home">
+ <i class="none"></i>
+ Home</a>
+ </li>
+
+ <li>
+
+ <a href="http://www.apache.org/foundation/sponsorship.html" class="externalLink" title="Donate">
+ <i class="none"></i>
+ Donate</a>
+ </li>
+
+ <li>
+
+ <a href="http://www.apache.org/foundation/thanks.html" class="externalLink" title="Thanks">
+ <i class="none"></i>
+ Thanks</a>
+ </li>
+
+ <li>
+
+ <a href="http://www.apache.org/security/" class="externalLink" title="Security">
+ <i class="none"></i>
+ Security</a>
+ </li>
+ <li class="nav-header">User Documentation</li>
+
+ <li>
+
+ <a href="../install.html" title="Installing and Managing AsterixDB using Managix">
+ <i class="none"></i>
+ Installing and Managing AsterixDB using Managix</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/primer.html" title="AsterixDB 101: An ADM and AQL Primer">
+ <i class="none"></i>
+ AsterixDB 101: An ADM and AQL Primer</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/primer-sql-like.html" title="AsterixDB 101: An ADM and AQL Primer (For SQL Fans)">
+ <i class="none"></i>
+ AsterixDB 101: An ADM and AQL Primer (For SQL Fans)</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/js-sdk.html" title="AsterixDB Javascript SDK">
+ <i class="none"></i>
+ AsterixDB Javascript SDK</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/datamodel.html" title="Asterix Data Model (ADM)">
+ <i class="none"></i>
+ Asterix Data Model (ADM)</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/manual.html" title="Asterix Query Language (AQL)">
+ <i class="none"></i>
+ Asterix Query Language (AQL)</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/functions.html" title="AQL Functions">
+ <i class="none"></i>
+ AQL Functions</a>
+ </li>
+
+ <li class="active">
+
+ <a href="#"><i class="none"></i>AQL Allen's Relations Functions</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/similarity.html" title="AQL Support of Similarity Queries">
+ <i class="none"></i>
+ AQL Support of Similarity Queries</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/externaldata.html" title="Accessing External Data">
+ <i class="none"></i>
+ Accessing External Data</a>
+ </li>
+
+ <li>
+
+ <a href="../aql/filters.html" title="Filter-Based LSM Index Acceleration">
+ <i class="none"></i>
+ Filter-Based LSM Index Acceleration</a>
+ </li>
+
+ <li>
+
+ <a href="../api.html" title="REST API to AsterixDB">
+ <i class="none"></i>
+ REST API to AsterixDB</a>
+ </li>
+ </ul>
+
+
+
+ <hr class="divider" />
+
+ <div id="poweredBy">
+ <div class="clear"></div>
+ <div class="clear"></div>
+ <div class="clear"></div>
+ <a href=".././" title="Hyracks" class="builtBy">
+ <img class="builtBy" alt="Hyracks" src="../images/hyrax_ts.png" />
+ </a>
+ </div>
+ </div>
+ </div>
+
+
+ <div id="bodyColumn" class="span9" >
+
+ <h1>AsterixDB Temporal Functions: Allen’s Relations</h1>
+<div class="section">
+<h2><a name="toc" id="toc">Table of Contents</a><a name="Table_of_Contents"></a></h2>
+
+<ul>
+
+<li><a href="#AboutAllensRelations">About Allen’s Relations</a></li>
+
+<li><a href="#AllensRelatonsFunctions">Allen’s Relations Functions</a></li>
+</ul></div>
+<div class="section">
+<h2><a name="AboutAllensRelations" id="AboutAllensRelations">About Allen’s Relations</a> <font size="4"><a href="#toc">[Back to TOC]</a></font><a name="About_Allens_Relations_Back_to_TOC"></a></h2>
+<p>AsterixDB supports Allen’s relations over interval types. Allen’s relations are also called Allen’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’s relations can be found from its <a class="externalLink" href="http://en.wikipedia.org/wiki/Allen's_interval_algebra">wikipedia entry</a>. </p></div>
+<div class="section">
+<h2><a name="AllensRelatonsFunctions" id="AllensRelatonsFunctions">Allen’s Relations Functions</a> <font size="4"><a href="#toc">[Back to TOC]</a></font><a name="Allens_Relations_Functions_Back_to_TOC"></a></h2>
+<div class="section">
+<h3>interval-before, interval-after<a name="interval-before_interval-after"></a></h3>
+
+<ul>
+
+<li>
+<p>Syntax:</p>
+
+<div class="source">
+<pre>interval-before(interval1, interval2)
+interval-after(interval1, interval2)
+</pre></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 < interval2.start</tt>, and <tt>interval-after(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">
+<pre>let $itv1 := interval-from-date("2000-01-01", "2005-01-01")
+let $itv2 := interval-from-date("2005-05-01", "2012-09-09")
+return {"interval-before": interval-before($itv1, $itv2), "interval-after": interval-after($itv2, $itv1)}
+</pre></div></li>
+
+<li>
+<p>The expected result is:</p>
+
+<div class="source">
+<pre>{ "interval-before": true, "interval-after": true }
+</pre></div></li>
+</ul></div>
+<div class="section">
+<h3>interval-covers, interval-covered-by<a name="interval-covers_interval-covered-by"></a></h3>
+
+<ul>
+
+<li>
+<p>Syntax:</p>
+
+<div class="source">
+<pre>interval-covers(interval1, interval2)
+interval-covered-by(interval1, interval2)
+</pre></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">
+<pre>interval1.start <= interval2.start
+AND interval1.end >= interval2.end
+</pre></div>
+<p><tt>interval-covered-by(interval1, interval2)</tt> is true if and only if</p>
+
+<div class="source">
+<pre>interval2.start <= interval1.start
+AND interval2.end >= interval1.end
+</pre></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">
+<pre>let $itv1 := interval-from-date("2000-01-01", "2005-01-01")
+let $itv2 := interval-from-date("2000-03-01", "2004-09-09")
+let $itv3 := interval-from-date("2006-08-01", "2007-03-01")
+let $itv4 := interval-from-date("2004-09-10", "2012-08-01")
+return {"interval-covers": interval-covers($itv1, $itv2), "interval-covered-by": interval-covered-by($itv3, $itv4)}
+</pre></div></li>
+
+<li>
+<p>The expected result is:</p>
+
+<div class="source">
+<pre>{ "interval-covers": true, "interval-covered-by": true }
+</pre></div></li>
+</ul></div>
+<div class="section">
+<h3>interval-overlaps, interval-overlapped-by<a name="interval-overlaps_interval-overlapped-by"></a></h3>
+
+<ul>
+
+<li>
+<p>Syntax:</p>
+
+<div class="source">
+<pre>interval-overlaps(interval1, interval2)
+interval-overlapped-by(interval1, interval2)
+</pre></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">
+<pre>interval1.start < interval2.start
+AND interval2.end > interval1.end
+AND interval1.end > interval2.start
+</pre></div>
+<p><tt>interval-overlapped-by(interval1, interval2)</tt> is true if and only if</p>
+
+<div class="source">
+<pre>interval2.start < interval1.start
+AND interval1.end > interval2.end
+AND interval2.end > interval1.start
+</pre></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’s relations on the definition of overlap.</p></li>
+
+<li>
+<p>Examples:</p>
+
+<div class="source">
+<pre>let $itv1 := interval-from-date("2000-01-01", "2005-01-01")
+let $itv2 := interval-from-date("2004-05-01", "2012-09-09")
+let $itv3 := interval-from-date("2006-08-01", "2007-03-01")
+let $itv4 := interval-from-date("2004-09-10", "2006-12-31")
+return {"overlaps": interval-overlaps($itv1, $itv2),
+ "overlapped-by": interval-overlapped-by($itv3, $itv4)}
+</pre></div></li>
+
+<li>
+<p>The expected result is:</p>
+
+<div class="source">
+<pre>{ "overlaps": true, "overlapped-by": true }
+</pre></div></li>
+</ul></div>
+<div class="section">
+<h3>interval-overlapping<a name="interval-overlapping"></a></h3>
+<p>Note that <tt>interval-overlapping</tt> is not an Allen’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">
+<pre>interval-overlapping(interval1, interval2)
+</pre></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">
+<pre>(interval2.start >= interval1.start
+AND interval2.start < interval1.end)
+OR
+(interval2.end > interval1.start
+AND interval2.end <= interval1.end)
+</pre></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">
+<pre>let $itv1 := interval-from-date("2000-01-01", "2005-01-01")
+let $itv2 := interval-from-date("2004-05-01", "2012-09-09")
+let $itv3 := interval-from-date("2006-08-01", "2007-03-01")
+let $itv4 := interval-from-date("2004-09-10", "2006-12-31")
+return {"overlapping1": interval-overlapping($itv1, $itv2),
+ "overlapping2": interval-overlapping($itv3, $itv4)}
+</pre></div></li>
+
+<li>
+<p>The expected result is:</p>
+
+<div class="source">
+<pre>{ "overlapping1": true, "overlapping2": true }
+</pre></div></li>
+</ul></div>
+<div class="section">
+<h3>interval-meets, interval-met-by<a name="interval-meets_interval-met-by"></a></h3>
+
+<ul>
+
+<li>
+<p>Syntax:</p>
+
+<div class="source">
+<pre>interval-meets(interval1, interval2)
+interval-met-by(interval1, interval2)
+</pre></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">
+<pre>let $itv1 := interval-from-date("2000-01-01", "2005-01-01")
+let $itv2 := interval-from-date("2005-01-01", "2012-09-09")
+let $itv3 := interval-from-date("2006-08-01", "2007-03-01")
+let $itv4 := interval-from-date("2004-09-10", "2006-08-01")
+return {"meets": interval-meets($itv1, $itv2), "metby": interval-met-by($itv3, $itv4)}
+</pre></div></li>
+
+<li>
+<p>The expected result is:</p>
+
+<div class="source">
+<pre>{ "meets": true, "metby": true }
+</pre></div></li>
+</ul></div>
+<div class="section">
+<h3>interval-starts, interval-started-by<a name="interval-starts_interval-started-by"></a></h3>
+
+<ul>
+
+<li>
+<p>Syntax:</p>
+
+<div class="source">
+<pre>interval-starts(interval1, interval2)
+interval-started-by(interval1, interval2)
+</pre></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">
+<pre>interval1.start = interval2.start
+AND interval1.end <= interval2.end
+</pre></div>
+<p><tt>interval-started-by(interval1, interval2)</tt> returns true if and only if</p>
+
+<div class="source">
+<pre>interval1.start = interval2.start
+AND interval2.end <= interval1.end
+</pre></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">
+<pre>let $itv1 := interval-from-date("2000-01-01", "2005-01-01")
+let $itv2 := interval-from-date("2000-01-01", "2012-09-09")
+let $itv3 := interval-from-date("2006-08-01", "2007-03-01")
+let $itv4 := interval-from-date("2006-08-01", "2006-08-01")
+return {"interval-starts": interval-starts($itv1, $itv2), "interval-started-by": interval-started-by($itv3, $itv4)}
+</pre></div></li>
+
+<li>
+<p>The expected result is:</p>
+
+<div class="source">
+<pre>{ "interval-starts": true, "interval-started-by": true }
+</pre></div></li>
+</ul></div>
+<div class="section">
+<h3>interval-ends, interval-ended-by<a name="interval-ends_interval-ended-by"></a></h3>
+
+<ul>
+
+<li>
+<p>Syntax:</p>
+
+<div class="source">
+<pre>interval-ends(interval1, interval2)
+interval-ended-by(interval1, interval2)
+</pre></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">
+<pre>interval1.end = interval2.end
+AND interval1.start >= interval2.start
+</pre></div>
+<p><tt>interval-ended-by(interval1, interval2)</tt> returns true if and only if</p>
+
+<div class="source">
+<pre>interval2.end = interval1.end
+AND interval2.start >= interval1.start
+</pre></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">
+<pre>let $itv1 := interval-from-date("2000-01-01", "2005-01-01")
+let $itv2 := interval-from-date("1998-01-01", "2005-01-01")
+let $itv3 := interval-from-date("2006-08-01", "2007-03-01")
+let $itv4 := interval-from-date("2006-09-10", "2007-03-01")
+return {"interval-ends": interval-ends($itv1, $itv2), "interval-ended-by": interval-ended-by($itv3, $itv4) }
+</pre></div></li>
+
+<li>
+<p>The expected result is:</p>
+
+<div class="source">
+<pre>{ "interval-ends": true, "interval-ended-by": true }
+</pre></div></li>
+</ul></div></div>
+ </div>
+ </div>
+ </div>
+
+ <hr/>
+
+ <footer>
+ <div class="container-fluid">
+ <div class="row span12">Copyright © 2015.
+ All Rights Reserved.
+
+ </div>
+
+ <?xml version="1.0" encoding="UTF-8"?>
+<div class="row-fluid">Apache AsterixDB, AsterixDB, Apache, the Apache
+ feather logo, and the Apache AsterixDB project logo are either
+ registered trademarks or trademarks of The Apache Software
+ Foundation in the United States and other countries.
+ All other marks mentioned may be trademarks or registered
+ trademarks of their respective owners.</div>
+
+
+ </div>
+ </footer>
+ </body>
+</html>