docs/0.15.0-incubating/misc/math-expr.html - druid-website - Git at Google

 <!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta name="description" content="Apache Druid">
 <meta name="keywords" content="druid,kafka,database,analytics,streaming,real-time,real time,apache,open source">
 <meta name="author" content="Apache Software Foundation">

 <title>Druid | Apache Druid (incubating) Expressions</title>

 <link rel="alternate" type="application/atom+xml" href="/feed">
 <link rel="shortcut icon" href="/img/favicon.png">

 <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">

 <link href='//fonts.googleapis.com/css?family=Open+Sans+Condensed:300,700,300italic|Open+Sans:300italic,400italic,600italic,400,300,600,700' rel='stylesheet' type='text/css'>

 <link rel="stylesheet" href="/css/bootstrap-pure.css?v=1.1">
 <link rel="stylesheet" href="/css/base.css?v=1.1">
 <link rel="stylesheet" href="/css/header.css?v=1.1">
 <link rel="stylesheet" href="/css/footer.css?v=1.1">
 <link rel="stylesheet" href="/css/syntax.css?v=1.1">
 <link rel="stylesheet" href="/css/docs.css?v=1.1">

 <script>
   (function() {
     var cx = '000162378814775985090:molvbm0vggm';
     var gcse = document.createElement('script');
     gcse.type = 'text/javascript';
     gcse.async = true;
     gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
         '//cse.google.com/cse.js?cx=' + cx;
     var s = document.getElementsByTagName('script')[0];
     s.parentNode.insertBefore(gcse, s);
   })();
 </script>


   </head>

   <body>
     <!-- Start page_header include -->
 <script src="//ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

 <div class="top-navigator">
   <div class="container">
     <div class="left-cont">
       <a class="logo" href="/"><span class="druid-logo"></span></a>
     </div>
     <div class="right-cont">
       <ul class="links">
         <li class=""><a href="/technology">Technology</a></li>
         <li class=""><a href="/use-cases">Use Cases</a></li>
         <li class=""><a href="/druid-powered">Powered By</a></li>
         <li class=""><a href="/docs/latest/design/">Docs</a></li>
         <li class=""><a href="/community/">Community</a></li>
         <li class="header-dropdown">
           <a>Apache</a>
           <div class="header-dropdown-menu">
             <a href="https://www.apache.org/" target="_blank">Foundation</a>
             <a href="https://www.apache.org/events/current-event" target="_blank">Events</a>
             <a href="https://www.apache.org/licenses/" target="_blank">License</a>
             <a href="https://www.apache.org/foundation/thanks.html" target="_blank">Thanks</a>
             <a href="https://www.apache.org/security/" target="_blank">Security</a>
             <a href="https://www.apache.org/foundation/sponsorship.html" target="_blank">Sponsorship</a>
           </div>
         </li>
         <li class=" button-link"><a href="/downloads.html">Download</a></li>
       </ul>
     </div>
   </div>
   <div class="action-button menu-icon">
     <span class="fa fa-bars"></span> MENU
   </div>
   <div class="action-button menu-icon-close">
     <span class="fa fa-times"></span> MENU
   </div>
 </div>

 <script type="text/javascript">
   var $menu = $('.right-cont');
   var $menuIcon = $('.menu-icon');
   var $menuIconClose = $('.menu-icon-close');

   function showMenu() {
     $menu.fadeIn(100);
     $menuIcon.fadeOut(100);
     $menuIconClose.fadeIn(100);
   }

   $menuIcon.click(showMenu);

   function hideMenu() {
     $menu.fadeOut(100);
     $menuIconClose.fadeOut(100);
     $menuIcon.fadeIn(100);
   }

   $menuIconClose.click(hideMenu);

   $(window).resize(function() {
     if ($(window).width() >= 840) {
       $menu.fadeIn(100);
       $menuIcon.fadeOut(100);
       $menuIconClose.fadeOut(100);
     }
     else {
       $menu.fadeOut(100);
       $menuIcon.fadeIn(100);
       $menuIconClose.fadeOut(100);
     }
   });
 </script>

 <!-- Stop page_header include -->


     <div class="container doc-container">


       <p> Looking for the <a href="/docs/0.19.0/">latest stable documentation</a>?</p>


       <div class="row">
         <div class="col-md-9 doc-content">
           <p>
             <a class="btn btn-default btn-xs visible-xs-inline-block visible-sm-inline-block" href="#toc">Table of Contents</a>
           </p>
           <!--
   ~ 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
   ~
   ~ Unless required by applicable law or agreed to in writing,
   ~ software distributed under the License is distributed on an
   ~ "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 id="apache-druid-incubating-expressions">Apache Druid (incubating) Expressions</h1>

 <div class="note info">
 This feature is still experimental. It has not been optimized for performance yet, and its implementation is known to have significant inefficiencies.
 </div>


 <p>This expression language supports the following operators (listed in decreasing order of precedence).</p>

 <table><thead>
 <tr>
 <th>Operators</th>
 <th>Description</th>
 </tr>
 </thead><tbody>
 <tr>
 <td>!, -</td>
 <td>Unary NOT and Minus</td>
 </tr>
 <tr>
 <td>^</td>
 <td>Binary power op</td>
 </tr>
 <tr>
 <td>*, /, %</td>
 <td>Binary multiplicative</td>
 </tr>
 <tr>
 <td>+, -</td>
 <td>Binary additive</td>
 </tr>
 <tr>
 <td>&lt;, &lt;=, &gt;, &gt;=, ==, !=</td>
 <td>Binary Comparison</td>
 </tr>
 <tr>
 <td>&amp;&amp;, &#124;</td>
 <td>Binary Logical AND, OR</td>
 </tr>
 </tbody></table>

 <p>Long, double, and string data types are supported. If a number contains a dot, it is interpreted as a double, otherwise it is interpreted as a long. That means, always add a &#39;.&#39; to your number if you want it interpreted as a double value. String literals should be quoted by single quotation marks.</p>

 <p>Multi-value types are not fully supported yet. Expressions may behave inconsistently on multi-value types, and you
 should not rely on the behavior in this case to stay the same in future releases.</p>

 <p>Expressions can contain variables. Variable names may contain letters, digits, &#39;_&#39; and &#39;$&#39;. Variable names must not begin with a digit. To escape other special characters, you can quote it with double quotation marks.</p>

 <p>For logical operators, a number is true if and only if it is positive (0 or negative value means false). For string type, it&#39;s the evaluation result of &#39;Boolean.valueOf(string)&#39;.</p>

 <p>The following built-in functions are available.</p>

 <h2 id="general-functions">General functions</h2>

 <table><thead>
 <tr>
 <th>name</th>
 <th>description</th>
 </tr>
 </thead><tbody>
 <tr>
 <td>cast</td>
 <td>cast(expr,&#39;LONG&#39; or &#39;DOUBLE&#39; or &#39;STRING&#39;) returns expr with specified type. exception can be thrown</td>
 </tr>
 <tr>
 <td>if</td>
 <td>if(predicate,then,else) returns &#39;then&#39; if &#39;predicate&#39; evaluates to a positive number, otherwise it returns &#39;else&#39;</td>
 </tr>
 <tr>
 <td>nvl</td>
 <td>nvl(expr,expr-for-null) returns &#39;expr-for-null&#39; if &#39;expr&#39; is null (or empty string for string type)</td>
 </tr>
 <tr>
 <td>like</td>
 <td>like(expr, pattern[, escape]) is equivalent to SQL <code>expr LIKE pattern</code></td>
 </tr>
 <tr>
 <td>case_searched</td>
 <td>case_searched(expr1, result1, [[expr2, result2, ...], else-result])</td>
 </tr>
 <tr>
 <td>case_simple</td>
 <td>case_simple(expr, value1, result1, [[value2, result2, ...], else-result])</td>
 </tr>
 <tr>
 <td>bloom_filter_test</td>
 <td>bloom_filter_test(expr, filter) tests the value of &#39;expr&#39; against &#39;filter&#39;, a bloom filter serialized as a base64 string. See <a href="../development/extensions-core/bloom-filter.html">bloom filter extension</a> documentation for additional details.</td>
 </tr>
 </tbody></table>

 <h2 id="string-functions">String functions</h2>

 <table><thead>
 <tr>
 <th>name</th>
 <th>description</th>
 </tr>
 </thead><tbody>
 <tr>
 <td>concat</td>
 <td>concat(expr, expr...) concatenate a list of strings</td>
 </tr>
 <tr>
 <td>format</td>
 <td>format(pattern[, args...]) returns a string formatted in the manner of Java&#39;s <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#format-java.lang.String-java.lang.Object...-">String.format</a>.</td>
 </tr>
 <tr>
 <td>like</td>
 <td>like(expr, pattern[, escape]) is equivalent to SQL <code>expr LIKE pattern</code></td>
 </tr>
 <tr>
 <td>lookup</td>
 <td>lookup(expr, lookup-name) looks up expr in a registered <a href="../querying/lookups.html">query-time lookup</a></td>
 </tr>
 <tr>
 <td>parse_long</td>
 <td>parse_long(string[, radix]) parses a string as a long with the given radix, or 10 (decimal) if a radix is not provided.</td>
 </tr>
 <tr>
 <td>regexp_extract</td>
 <td>regexp_extract(expr, pattern[, index]) applies a regular expression pattern and extracts a capture group index, or null if there is no match. If index is unspecified or zero, returns the substring that matched the pattern.</td>
 </tr>
 <tr>
 <td>replace</td>
 <td>replace(expr, pattern, replacement) replaces pattern with replacement</td>
 </tr>
 <tr>
 <td>substring</td>
 <td>substring(expr, index, length) behaves like java.lang.String&#39;s substring</td>
 </tr>
 <tr>
 <td>right</td>
 <td>right(expr, length) returns the rightmost length characters from a string</td>
 </tr>
 <tr>
 <td>left</td>
 <td>left(expr, length) returns the leftmost length characters from a string</td>
 </tr>
 <tr>
 <td>strlen</td>
 <td>strlen(expr) returns length of a string in UTF-16 code units</td>
 </tr>
 <tr>
 <td>strpos</td>
 <td>strpos(haystack, needle[, fromIndex]) returns the position of the needle within the haystack, with indexes starting from 0. The search will begin at fromIndex, or 0 if fromIndex is not specified. If the needle is not found then the function returns -1.</td>
 </tr>
 <tr>
 <td>trim</td>
 <td>trim(expr[, chars]) remove leading and trailing characters from <code>expr</code> if they are present in <code>chars</code>. <code>chars</code> defaults to &#39; &#39; (space) if not provided.</td>
 </tr>
 <tr>
 <td>ltrim</td>
 <td>ltrim(expr[, chars]) remove leading characters from <code>expr</code> if they are present in <code>chars</code>. <code>chars</code> defaults to &#39; &#39; (space) if not provided.</td>
 </tr>
 <tr>
 <td>rtrim</td>
 <td>rtrim(expr[, chars]) remove trailing characters from <code>expr</code> if they are present in <code>chars</code>. <code>chars</code> defaults to &#39; &#39; (space) if not provided.</td>
 </tr>
 <tr>
 <td>lower</td>
 <td>lower(expr) converts a string to lowercase</td>
 </tr>
 <tr>
 <td>upper</td>
 <td>upper(expr) converts a string to uppercase</td>
 </tr>
 <tr>
 <td>reverse</td>
 <td>reverse(expr) reverses a string</td>
 </tr>
 <tr>
 <td>repeat</td>
 <td>repeat(expr, N) repeats a string N times</td>
 </tr>
 <tr>
 <td>lpad</td>
 <td>lpad(expr, length, chars) returns a string of <code>length</code> from <code>expr</code> left-padded with <code>chars</code>. If <code>length</code> is shorter than the length of <code>expr</code>, the result is <code>expr</code> which is truncated to <code>length</code>. If either <code>expr</code> or <code>chars</code> are null, the result will be null.</td>
 </tr>
 <tr>
 <td>rpad</td>
 <td>rpad(expr, length, chars) returns a string of <code>length</code> from <code>expr</code> right-padded with <code>chars</code>. If <code>length</code> is shorter than the length of <code>expr</code>, the result is <code>expr</code> which is truncated to <code>length</code>. If either <code>expr</code> or <code>chars</code> are null, the result will be null.</td>
 </tr>
 </tbody></table>

 <h2 id="time-functions">Time functions</h2>

 <table><thead>
 <tr>
 <th>name</th>
 <th>description</th>
 </tr>
 </thead><tbody>
 <tr>
 <td>timestamp</td>
 <td>timestamp(expr[,format-string]) parses string expr into date then returns milli-seconds from java epoch. without &#39;format-string&#39; it&#39;s regarded as ISO datetime format</td>
 </tr>
 <tr>
 <td>unix_timestamp</td>
 <td>same with &#39;timestamp&#39; function but returns seconds instead</td>
 </tr>
 <tr>
 <td>timestamp_ceil</td>
 <td>timestamp_ceil(expr, period, [origin, [timezone]]) rounds up a timestamp, returning it as a new timestamp. Period can be any ISO8601 period, like P3M (quarters) or PT12H (half-days). The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td>
 </tr>
 <tr>
 <td>timestamp_floor</td>
 <td>timestamp_floor(expr, period, [origin, [timezone]]) rounds down a timestamp, returning it as a new timestamp. Period can be any ISO8601 period, like P3M (quarters) or PT12H (half-days). The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td>
 </tr>
 <tr>
 <td>timestamp_shift</td>
 <td>timestamp_shift(expr, period, step, [timezone]) shifts a timestamp by a period (step times), returning it as a new timestamp. Period can be any ISO8601 period. Step may be negative. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;.</td>
 </tr>
 <tr>
 <td>timestamp_extract</td>
 <td>timestamp_extract(expr, unit, [timezone]) extracts a time part from expr, returning it as a number. Unit can be EPOCH (number of seconds since 1970-01-01 00:00:00 UTC), SECOND, MINUTE, HOUR, DAY (day of month), DOW (day of week), DOY (day of year), WEEK (week of <a href="https://en.wikipedia.org/wiki/ISO_week_date">week year</a>), MONTH (1 through 12), QUARTER (1 through 4), or YEAR. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;</td>
 </tr>
 <tr>
 <td>timestamp_parse</td>
 <td>timestamp_parse(string expr, [pattern, [timezone]]) parses a string into a timestamp using a given <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat pattern</a>. If the pattern is not provided, this parses time strings in either ISO8601 or SQL format. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;, and will be used as the time zone for strings that do not include a time zone offset. Pattern and time zone must be literals. Strings that cannot be parsed as timestamps will be returned as nulls.</td>
 </tr>
 <tr>
 <td>timestamp_format</td>
 <td>timestamp_format(expr, [pattern, [timezone]]) formats a timestamp as a string with a given <a href="http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html">Joda DateTimeFormat pattern</a>, or ISO8601 if the pattern is not provided. The time zone, if provided, should be a time zone name like &quot;America/Los_Angeles&quot; or offset like &quot;-08:00&quot;. Pattern and time zone must be literals.</td>
 </tr>
 </tbody></table>

 <h2 id="math-functions">Math functions</h2>

 <p>See javadoc of java.lang.Math for detailed explanation for each function.</p>

 <table><thead>
 <tr>
 <th>name</th>
 <th>description</th>
 </tr>
 </thead><tbody>
 <tr>
 <td>abs</td>
 <td>abs(x) would return the absolute value of x</td>
 </tr>
 <tr>
 <td>acos</td>
 <td>acos(x) would return the arc cosine of x</td>
 </tr>
 <tr>
 <td>asin</td>
 <td>asin(x) would return the arc sine of x</td>
 </tr>
 <tr>
 <td>atan</td>
 <td>atan(x) would return the arc tangent of x</td>
 </tr>
 <tr>
 <td>atan2</td>
 <td>atan2(y, x) would return the angle theta from the conversion of rectangular coordinates (x, y) to polar * coordinates (r, theta)</td>
 </tr>
 <tr>
 <td>cbrt</td>
 <td>cbrt(x) would return the cube root of x</td>
 </tr>
 <tr>
 <td>ceil</td>
 <td>ceil(x) would return the smallest (closest to negative infinity) double value that is greater than or equal to x and is equal to a mathematical integer</td>
 </tr>
 <tr>
 <td>copysign</td>
 <td>copysign(x) would return the first floating-point argument with the sign of the second floating-point argument</td>
 </tr>
 <tr>
 <td>cos</td>
 <td>cos(x) would return the trigonometric cosine of x</td>
 </tr>
 <tr>
 <td>cosh</td>
 <td>cosh(x) would return the hyperbolic cosine of x</td>
 </tr>
 <tr>
 <td>cot</td>
 <td>cot(x) would return the trigonometric cotangent of an angle x</td>
 </tr>
 <tr>
 <td>div</td>
 <td>div(x,y) is integer division of x by y</td>
 </tr>
 <tr>
 <td>exp</td>
 <td>exp(x) would return Euler&#39;s number raised to the power of x</td>
 </tr>
 <tr>
 <td>expm1</td>
 <td>expm1(x) would return e^x-1</td>
 </tr>
 <tr>
 <td>floor</td>
 <td>floor(x) would return the largest (closest to positive infinity) double value that is less than or equal to x and is equal to a mathematical integer</td>
 </tr>
 <tr>
 <td>getExponent</td>
 <td>getExponent(x) would return the unbiased exponent used in the representation of x</td>
 </tr>
 <tr>
 <td>hypot</td>
 <td>hypot(x, y) would return sqrt(x^2+y^2) without intermediate overflow or underflow</td>
 </tr>
 <tr>
 <td>log</td>
 <td>log(x) would return the natural logarithm of x</td>
 </tr>
 <tr>
 <td>log10</td>
 <td>log10(x) would return the base 10 logarithm of x</td>
 </tr>
 <tr>
 <td>log1p</td>
 <td>log1p(x) would the natural logarithm of x + 1</td>
 </tr>
 <tr>
 <td>max</td>
 <td>max(x, y) would return the greater of two values</td>
 </tr>
 <tr>
 <td>min</td>
 <td>min(x, y) would return the smaller of two values</td>
 </tr>
 <tr>
 <td>nextafter</td>
 <td>nextafter(x, y) would return the floating-point number adjacent to the x in the direction of the y</td>
 </tr>
 <tr>
 <td>nextUp</td>
 <td>nextUp(x) would return the floating-point value adjacent to x in the direction of positive infinity</td>
 </tr>
 <tr>
 <td>pi</td>
 <td>pi would return the constant value of the π</td>
 </tr>
 <tr>
 <td>pow</td>
 <td>pow(x, y) would return the value of the x raised to the power of y</td>
 </tr>
 <tr>
 <td>remainder</td>
 <td>remainder(x, y) would return the remainder operation on two arguments as prescribed by the IEEE 754 standard</td>
 </tr>
 <tr>
 <td>rint</td>
 <td>rint(x) would return value that is closest in value to x and is equal to a mathematical integer</td>
 </tr>
 <tr>
 <td>round</td>
 <td>round(x, y) would return the value of the x rounded to the y decimal places. While x can be an integer or floating-point number, y must be an integer. The type of the return value is specified by that of x. y defaults to 0 if omitted. When y is negative, x is rounded on the left side of the y decimal points.</td>
 </tr>
 <tr>
 <td>scalb</td>
 <td>scalb(d, sf) would return d * 2^sf rounded as if performed by a single correctly rounded floating-point multiply to a member of the double value set</td>
 </tr>
 <tr>
 <td>signum</td>
 <td>signum(x) would return the signum function of the argument x</td>
 </tr>
 <tr>
 <td>sin</td>
 <td>sin(x) would return the trigonometric sine of an angle x</td>
 </tr>
 <tr>
 <td>sinh</td>
 <td>sinh(x) would return the hyperbolic sine of x</td>
 </tr>
 <tr>
 <td>sqrt</td>
 <td>sqrt(x) would return the correctly rounded positive square root of x</td>
 </tr>
 <tr>
 <td>tan</td>
 <td>tan(x) would return the trigonometric tangent of an angle x</td>
 </tr>
 <tr>
 <td>tanh</td>
 <td>tanh(x) would return the hyperbolic tangent of x</td>
 </tr>
 <tr>
 <td>todegrees</td>
 <td>todegrees(x) converts an angle measured in radians to an approximately equivalent angle measured in degrees</td>
 </tr>
 <tr>
 <td>toradians</td>
 <td>toradians(x) converts an angle measured in degrees to an approximately equivalent angle measured in radians</td>
 </tr>
 <tr>
 <td>ulp</td>
 <td>ulp(x) would return the size of an ulp of the argument x</td>
 </tr>
 </tbody></table>

         </div>
         <div class="col-md-3">
           <div class="searchbox">
             <gcse:searchbox-only></gcse:searchbox-only>
           </div>
           <div id="toc" class="nav toc hidden-print">
           </div>
         </div>
       </div>
     </div>

     <!-- Start page_footer include -->
 <footer class="druid-footer">
 <div class="container">
   <div class="text-center">
     <p>
     <a href="/technology">Technology</a>&ensp;·&ensp;
     <a href="/use-cases">Use Cases</a>&ensp;·&ensp;
     <a href="/druid-powered">Powered by Druid</a>&ensp;·&ensp;
     <a href="/docs/latest/">Docs</a>&ensp;·&ensp;
     <a href="/community/">Community</a>&ensp;·&ensp;
     <a href="/downloads.html">Download</a>&ensp;·&ensp;
     <a href="/faq">FAQ</a>
     </p>
   </div>
   <div class="text-center">
     <a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a>&ensp;·&ensp;
     <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a>&ensp;·&ensp;
     <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a>
   </div>
   <div class="text-center license">
     Copyright © 2020 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br>
     Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br>
     Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.
   </div>
 </div>
 </footer>

 <script async src="https://www.googletagmanager.com/gtag/js?id=UA-131010415-1"></script>
 <script>
   window.dataLayer = window.dataLayer || [];
   function gtag(){dataLayer.push(arguments);}
   gtag('js', new Date());
   gtag('config', 'UA-131010415-1');
 </script>
 <script>
   function trackDownload(type, url) {
     ga('send', 'event', 'download', type, url);
   }
 </script>
 <script src="//code.jquery.com/jquery.min.js"></script>
 <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
 <script src="/assets/js/druid.js"></script>
 <!-- stop page_footer include -->


     <script>
     $(function() {
       $(".toc").load("/docs/0.15.0-incubating/toc.html");

       // There is no way to tell when .gsc-input will be async loaded into the page so just try to set a placeholder until it works
       var tries = 0;
       var timer = setInterval(function() {
         tries++;
         if (tries > 300) clearInterval(timer);
         var searchInput = $('input.gsc-input');
         if (searchInput.length) {
           searchInput.attr('placeholder', 'Search');
           clearInterval(timer);
         }
       }, 100);
     });
     </script>
   </body>
 </html>