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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.profile</a></div>
<h1 title="Class SimpleProfiler" class="title">Class SimpleProfiler</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">org.apache.calcite.profile.SimpleProfiler</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="Profiler.html" title="interface in org.apache.calcite.profile">Profiler</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">SimpleProfiler</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
implements <a href="Profiler.html" title="interface in org.apache.calcite.profile">Profiler</a></span></div>
<div class="block">Basic implementation of <a href="Profiler.html" title="interface in org.apache.calcite.profile"><code>Profiler</code></a>.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== NESTED CLASS SUMMARY ======== -->
<li>
<section class="nested-class-summary" id="nested-class-summary">
<h2>Nested Class Summary</h2>
<div class="inherited-list">
<h2 id="nested-classes-inherited-from-class-org.apache.calcite.profile.Profiler">Nested classes/interfaces inherited from interface&nbsp;org.apache.calcite.profile.<a href="Profiler.html" title="interface in org.apache.calcite.profile">Profiler</a></h2>
<code><a href="Profiler.Column.html" title="class in org.apache.calcite.profile">Profiler.Column</a>, <a href="Profiler.Distribution.html" title="class in org.apache.calcite.profile">Profiler.Distribution</a>, <a href="Profiler.FunctionalDependency.html" title="class in org.apache.calcite.profile">Profiler.FunctionalDependency</a>, <a href="Profiler.Profile.html" title="class in org.apache.calcite.profile">Profiler.Profile</a>, <a href="Profiler.RowCount.html" title="class in org.apache.calcite.profile">Profiler.RowCount</a>, <a href="Profiler.Statistic.html" title="interface in org.apache.calcite.profile">Profiler.Statistic</a>, <a href="Profiler.Unique.html" title="class in org.apache.calcite.profile">Profiler.Unique</a></code></div>
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<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">SimpleProfiler</a>()</code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
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<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="Profiler.Profile.html" title="class in org.apache.calcite.profile">Profiler.Profile</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#profile(java.lang.Iterable,java.util.List,java.util.Collection)" class="member-name-link">profile</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Iterable.html" title="class or interface in java.lang" class="external-link">Iterable</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Comparable.html" title="class or interface in java.lang" class="external-link">Comparable</a>&gt;&gt;&nbsp;rows,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="Profiler.Column.html" title="class in org.apache.calcite.profile">Profiler.Column</a>&gt;&nbsp;columns,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a>&gt;&nbsp;initialGroups)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Creates a profile of a data set.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static double</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#surprise(double,double)" class="member-name-link">surprise</a><wbr>(double&nbsp;expected,
double&nbsp;actual)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Returns a measure of how much an actual value differs from expected.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;()">
<h3>SimpleProfiler</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">SimpleProfiler</span>()</div>
</section>
</li>
</ul>
</section>
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<!-- ============ METHOD DETAIL ========== -->
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<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="profile(java.lang.Iterable,java.util.List,java.util.Collection)">
<h3>profile</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="Profiler.Profile.html" title="class in org.apache.calcite.profile">Profiler.Profile</a></span>&nbsp;<span class="element-name">profile</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Iterable.html" title="class or interface in java.lang" class="external-link">Iterable</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Comparable.html" title="class or interface in java.lang" class="external-link">Comparable</a>&gt;&gt;&nbsp;rows,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="Profiler.Column.html" title="class in org.apache.calcite.profile">Profiler.Column</a>&gt;&nbsp;columns,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a>&gt;&nbsp;initialGroups)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="Profiler.html#profile(java.lang.Iterable,java.util.List,java.util.Collection)">Profiler</a></code></span></div>
<div class="block">Creates a profile of a data set.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="Profiler.html#profile(java.lang.Iterable,java.util.List,java.util.Collection)">profile</a></code>&nbsp;in interface&nbsp;<code><a href="Profiler.html" title="interface in org.apache.calcite.profile">Profiler</a></code></dd>
<dt>Parameters:</dt>
<dd><code>rows</code> - List of rows. Can be iterated over more than once (maybe not
cheaply)</dd>
<dd><code>columns</code> - Column definitions</dd>
<dd><code>initialGroups</code> - List of combinations of columns that should be
profiled early, because they may be interesting</dd>
<dt>Returns:</dt>
<dd>A profile describing relationships within the data set</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="surprise(double,double)">
<h3>surprise</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">double</span>&nbsp;<span class="element-name">surprise</span><wbr><span class="parameters">(double&nbsp;expected,
double&nbsp;actual)</span></div>
<div class="block">Returns a measure of how much an actual value differs from expected.
The formula is <code>abs(expected - actual) / (expected + actual)</code>.
<p>Examples:<ul>
<li>surprise(e, a) is always between 0 and 1;
<li>surprise(e, a) is 0 if e = a;
<li>surprise(e, 0) is 1 if e &gt; 0;
<li>surprise(0, a) is 1 if a &gt; 0;
<li>surprise(5, 0) is 100%;
<li>surprise(5, 3) is 25%;
<li>surprise(5, 4) is 11%;
<li>surprise(5, 5) is 0%;
<li>surprise(5, 6) is 9%;
<li>surprise(5, 16) is 52%;
<li>surprise(5, 100) is 90%;
</ul></div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>expected</code> - Expected value</dd>
<dd><code>actual</code> - Actual value</dd>
<dt>Returns:</dt>
<dd>Measure of how much expected deviates from actual</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
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