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+ ! --><h1>AsterixDB Support of Full-text search queries</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="#Motivation">Motivation</a></li>
+  
+<li><a href="#Syntax">Syntax</a></li>
+  
+<li><a href="#FulltextIndex">Creating and utilizing a Full-text index</a></li>
+</ul></div>
+<div class="section">
+<h2><a name="Motivation_Back_to_TOC"></a><a name="Motivation" id="Motivation">Motivation</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p>Full-Text Search (FTS) queries are widely used in applications where users need to find records that satisfy an FTS predicate, i.e., where simple string-based matching is not sufficient. These queries are important when finding documents that contain a certain keyword is crucial. FTS queries are different from substring matching queries in that FTS queries find their query predicates as exact keywords in the given string, rather than treating a query predicate as a sequence of characters. For example, an FTS query that finds &#x201c;rain&#x201d; correctly returns a document when it contains &#x201c;rain&#x201d; as a word. However, a substring-matching query returns a document whenever it contains &#x201c;rain&#x201d; as a substring, for instance, a document with &#x201c;brain&#x201d; or &#x201c;training&#x201d; would be returned as well.</p></div>
+<div class="section">
+<h2><a name="Syntax_Back_to_TOC"></a><a name="Syntax" id="Syntax">Syntax</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p>The syntax of AsterixDB FTS follows a portion of the XQuery FullText Search syntax. Two basic forms are as follows:</p>
+
+<div class="source">
+<div class="source">
+<pre>    ftcontains(Expression1, Expression2, {FullTextOption})
+    ftcontains(Expression1, Expression2)
+</pre></div></div>
+<p>For example, we can execute the following query to find tweet messages where the <tt>message-text</tt> field includes &#x201c;voice&#x201d; as a word. Please note that an FTS search is case-insensitive. Thus, &#x201c;Voice&#x201d; or &#x201c;voice&#x201d; will be evaluated as the same word.</p>
+
+<div class="source">
+<div class="source">
+<pre>    use dataverse TinySocial;
+
+    for $msg in dataset TweetMessages
+    where ftcontains($msg.message-text, &quot;voice&quot;, {&quot;mode&quot;:&quot;any&quot;})
+    return {&quot;id&quot;: $msg.id}
+</pre></div></div>
+<p>The DDL and DML of TinySocial can be found in <a href="primer.html#ADM:_Modeling_Semistructed_Data_in_AsterixDB">ADM: Modeling Semistructed Data in AsterixDB</a>.</p>
+<p>The same query can be also expressed in the SQL++.</p>
+
+<div class="source">
+<div class="source">
+<pre>    use TinySocial;
+
+    select element {&quot;id&quot;:msg.id}
+    from TweetMessages as msg
+    where TinySocial.ftcontains(msg.`message-text`, &quot;voice&quot;, {&quot;mode&quot;:&quot;any&quot;})
+</pre></div></div>
+<p>The <tt>Expression1</tt> is an expression that should be evaluable as a string at runtime as in the above example where <tt>$msg.message-text</tt> is a string field. The <tt>Expression2</tt> can be a string, an (un)ordered list of string value(s), or an expression. In the last case, the given expression should be evaluable into one of the first two types, i.e., into a string value or an (un)ordered list of string value(s).</p>
+<p>The following examples are all valid expressions.</p>
+
+<div class="source">
+<div class="source">
+<pre>   ... where ftcontains($msg.message-text, &quot;sound&quot;)
+   ... where ftcontains($msg.message-text, &quot;sound&quot;, {&quot;mode&quot;:&quot;any&quot;})
+   ... where ftcontains($msg.message-text, [&quot;sound&quot;, &quot;system&quot;], {&quot;mode&quot;:&quot;any&quot;})
+   ... where ftcontains($msg.message-text, {{&quot;speed&quot;, &quot;stand&quot;, &quot;customization&quot;}}, {&quot;mode&quot;:&quot;all&quot;})
+   ... where ftcontains($msg.message-text, let $keyword_list := [&quot;voice&quot;, &quot;system&quot;] return $keyword_list, {&quot;mode&quot;:&quot;all&quot;})
+   ... where ftcontains($msg.message-text, $keyword_list, {&quot;mode&quot;:&quot;any&quot;})
+</pre></div></div>
+<p>In the last example above, <tt>$keyword_list</tt> should evaluate to a string or an (un)ordered list of string value(s).</p>
+<p>The last <tt>FullTextOption</tt> parameter clarifies the given FTS request. If you omit the <tt>FullTextOption</tt> parameter, then the default value will be set for each possible option. Currently, we only have one option named <tt>mode</tt>. And as we extend the FTS feature, more options will be added. Please note that the format of <tt>FullTextOption</tt> is a record, thus you need to put the option(s) in a record <tt>{}</tt>. The <tt>mode</tt> option indicates whether the given FTS query is a conjunctive (AND) or disjunctive (OR) search request. This option can be either <tt>&#x201c;any&#x201d;</tt> or <tt>&#x201c;all&#x201d;</tt>. The default value for <tt>mode</tt> is <tt>&#x201c;all&#x201d;</tt>. If one specifies <tt>&#x201c;any&#x201d;</tt>, a disjunctive search will be conducted. For example, the following query will find documents whose <tt>message-text</tt> field contains &#x201c;sound&#x201d; or &#x201c;system&#x201d;, so a document will be returned if it contains either &#x201c;sound&#x201d;, &#x201c;system&#x201d;, or both of the keywords.</p>
+
+<div class="source">
+<div class="source">
+<pre>   ... where ftcontains($msg.message-text, [&quot;sound&quot;, &quot;system&quot;], {&quot;mode&quot;:&quot;any&quot;})
+</pre></div></div>
+<p>The other option parameter,<tt>&#x201c;all&#x201d;</tt>, specifies a conjunctive search. The following examples will find the documents whose <tt>message-text</tt> field contains both &#x201c;sound&#x201d; and &#x201c;system&#x201d;. If a document contains only &#x201c;sound&#x201d; or &#x201c;system&#x201d; but not both, it will not be returned.</p>
+
+<div class="source">
+<div class="source">
+<pre>   ... where ftcontains($msg.message-text, [&quot;sound&quot;, &quot;system&quot;], {&quot;mode&quot;:&quot;all&quot;})
+   ... where ftcontains($msg.message-text, [&quot;sound&quot;, &quot;system&quot;])
+</pre></div></div>
+<p>Currently AsterixDB doesn&#x2019;t (yet) support phrase searches, so the following query will not work.</p>
+
+<div class="source">
+<div class="source">
+<pre>   ... where ftcontains($msg.message-text, &quot;sound system&quot;, {&quot;mode&quot;:&quot;any&quot;})
+</pre></div></div>
+<p>As a workaround solution, the following query can be used to achieve a roughly similar goal. The difference is that the following queries will find documents where <tt>$msg.message-text</tt> contains both &#x201c;sound&#x201d; and &#x201c;system&#x201d;, but the order and adjacency of &#x201c;sound&#x201d; and &#x201c;system&#x201d; are not checked, unlike in a phrase search. As a result, the query below would also return documents with &#x201c;sound system can be installed.&#x201d;, &#x201c;system sound is perfect.&#x201d;, or &#x201c;sound is not clear. You may need to install a new system.&#x201d;</p>
+
+<div class="source">
+<div class="source">
+<pre>   ... where ftcontains($msg.message-text, [&quot;sound&quot;, &quot;system&quot;], {&quot;mode&quot;:&quot;all&quot;})
+   ... where ftcontains($msg.message-text, [&quot;sound&quot;, &quot;system&quot;])
+</pre></div></div></div>
+<div class="section">
+<h2><a name="Creating_and_utilizing_a_Full-text_index_Back_to_TOC"></a><a name="FulltextIndex" id="FulltextIndex">Creating and utilizing a Full-text index</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p>When there is a full-text index on the field that is being searched, rather than scanning all records, AsterixDB can utilize that index to expedite the execution of a FTS query. To create a full-text index, you need to specify the index type as <tt>fulltext</tt> in your DDL statement. For instance, the following DDL statement create a full-text index on the TweetMessages.message-text attribute.</p>
+
+<div class="source">
+<div class="source">
+<pre>create index messageFTSIdx on TweetMessages(message-text) type fulltext;
+</pre></div></div></div>
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