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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rel</a></div>
<h2 title="Class InvalidRelException" class="title">Class InvalidRelException</h2>
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<pre>public class <span class="typeNameLabel">InvalidRelException</span>
extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang" class="externalLink">Exception</a></pre>
<div class="block">Exception that indicates that a relational expression would be invalid
with given parameters.
<p>This exception is thrown by the constructor of a subclass of
<a href="RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a> when given parameters it cannot accept. For example,
<code>EnumerableJoinRel</code> can only implement equi-joins, so its constructor
throws <code>InvalidRelException</code> when given the condition
<code>input0.x - input1.y = 2</code>.</p>
<p>Because the exception is checked (i.e. extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>Exception</code></a> but not
<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>RuntimeException</code></a>), constructors that throw this exception will
declare this exception in their <code>throws</code> clause, and rules that create
those relational expressions will need to handle it. Usually a rule will
not take the exception personally, and will fail to match. The burden of
checking is removed from the rule, which means less code for the author of
the rule to maintain.</p>
<p>The caller that receives an <code>InvalidRelException</code> (typically a rule
attempting to create a relational expression) should log it at
the DEBUG level.</p></div>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String)">InvalidRelException</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;message)</code></th>
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<div class="block">Creates an InvalidRelException.</div>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String,java.lang.Throwable)">InvalidRelException</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;message,
<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Throwable</a>&nbsp;cause)</code></th>
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<div class="block">Creates an InvalidRelException with a cause.</div>
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<h4>InvalidRelException</h4>
<pre>public&nbsp;InvalidRelException&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;message)</pre>
<div class="block">Creates an InvalidRelException.</div>
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<h4>InvalidRelException</h4>
<pre>public&nbsp;InvalidRelException&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;message,
<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Throwable</a>&nbsp;cause)</pre>
<div class="block">Creates an InvalidRelException with a cause.</div>
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