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| <h2 title="Class InvalidRelException" class="title">Class InvalidRelException</h2> |
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| <pre>public class <span class="typeNameLabel">InvalidRelException</span> |
| extends java.lang.Exception</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 <code>Exception</code> but not |
| <code>RuntimeException</code>), 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> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../serialized-form.html#org.apache.calcite.rel.InvalidRelException">Serialized Form</a></dd> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String)">InvalidRelException</a></span>​(java.lang.String message)</code></th> |
| <td class="colLast"> |
| <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>​(java.lang.String message, |
| java.lang.Throwable cause)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates an InvalidRelException with a cause.</div> |
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| <h4>InvalidRelException</h4> |
| <pre>public InvalidRelException​(java.lang.String message)</pre> |
| <div class="block">Creates an InvalidRelException.</div> |
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| <h4>InvalidRelException</h4> |
| <pre>public InvalidRelException​(java.lang.String message, |
| java.lang.Throwable cause)</pre> |
| <div class="block">Creates an InvalidRelException with a cause.</div> |
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