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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.piglet</a></div> |
| <h2 title="Class PigUdfFinder" class="title">Class PigUdfFinder</h2> |
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| <li>java.lang.Object</li> |
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| <pre>class <span class="typeNameLabel">PigUdfFinder</span> |
| extends java.lang.Object</pre> |
| <div class="block">Utility class to find the implementation method object for a given Pig UDF |
| class.</div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>private com.google.common.collect.ImmutableMap<java.lang.String,​java.lang.reflect.Method></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#udfWrapper">udfWrapper</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">For Pig UDF classes where the "exec" method is declared in parent class, |
| the Calcite enumerable engine will generate incorrect Java code that |
| instantiates an object of the parent class, not object of the actual UDF |
| class.</div> |
| </td> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">PigUdfFinder</a></span>()</code></th> |
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| <td class="colFirst"><code>private static java.lang.reflect.Method</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#findExecMethod(java.lang.reflect.Method%5B%5D)">findExecMethod</a></span>​(java.lang.reflect.Method[] methods)</code></th> |
| <td class="colLast"> |
| <div class="block">Finds "exec" method from a given array of methods.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) java.lang.reflect.Method</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#findPigUdfImplementationMethod(java.lang.Class)">findPigUdfImplementationMethod</a></span>​(java.lang.Class clazz)</code></th> |
| <td class="colLast"> |
| <div class="block">Finds the implementation method object for a given Pig UDF class.</div> |
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| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
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| <h4>udfWrapper</h4> |
| <pre>private final com.google.common.collect.ImmutableMap<java.lang.String,​java.lang.reflect.Method> udfWrapper</pre> |
| <div class="block">For Pig UDF classes where the "exec" method is declared in parent class, |
| the Calcite enumerable engine will generate incorrect Java code that |
| instantiates an object of the parent class, not object of the actual UDF |
| class. If the parent class is an abstract class, the auto-generated code |
| failed to compile (we can not instantiate an object of an abstract class). |
| |
| <p>Workaround is to write a wrapper for such UDFs to instantiate the |
| correct UDF object. See method <a href="PigUdfs.html#bigdecimalsum(org.apache.pig.data.Tuple)"><code>PigUdfs.bigdecimalsum(org.apache.pig.data.Tuple)</code></a> as an example |
| and add others if needed.</div> |
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| <h4>PigUdfFinder</h4> |
| <pre>PigUdfFinder()</pre> |
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| <h4>findPigUdfImplementationMethod</h4> |
| <pre class="methodSignature">@Nonnull |
| java.lang.reflect.Method findPigUdfImplementationMethod​(java.lang.Class clazz)</pre> |
| <div class="block">Finds the implementation method object for a given Pig UDF class.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>clazz</code> - The Pig UDF class</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if not found</dd> |
| </dl> |
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| <h4>findExecMethod</h4> |
| <pre class="methodSignature">private static java.lang.reflect.Method findExecMethod​(java.lang.reflect.Method[] methods)</pre> |
| <div class="block">Finds "exec" method from a given array of methods.</div> |
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