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 <h2 title="Class UdfTest" class="title">Class UdfTest</h2>
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 <pre>public class <span class="typeNameLabel">UdfTest</span>
 extends java.lang.Object</pre>
 <div class="block">Tests for user-defined functions;
  includes user-defined aggregate functions
  but user-defined table functions are in <a href="TableFunctionTest.html" title="class in org.apache.calcite.test"><code>TableFunctionTest</code></a>.</div>
 <dl>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../util/Smalls.html" title="class in org.apache.calcite.util"><code>Smalls</code></a></dd>
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 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colSecond" scope="col">Class</th>
 <th class="colLast" scope="col">Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private class&nbsp;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="UdfTest.ArrayAppendDoubleFunction.html" title="class in org.apache.calcite.test">UdfTest.ArrayAppendDoubleFunction</a></span></code></th>
 <td class="colLast">
 <div class="block">Function with signature "f(ARRAY OF DOUBLE, INTEGER) returns ARRAY OF
  DOUBLE".</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private class&nbsp;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="UdfTest.ArrayAppendIntegerFunction.html" title="class in org.apache.calcite.test">UdfTest.ArrayAppendIntegerFunction</a></span></code></th>
 <td class="colLast">
 <div class="block">Function with signature "f(ARRAY OF INTEGER, INTEGER) returns ARRAY OF
  INTEGER".</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static class&nbsp;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="UdfTest.ArrayAppendScalarFunction.html" title="class in org.apache.calcite.test">UdfTest.ArrayAppendScalarFunction</a></span></code></th>
 <td class="colLast">
 <div class="block">Base class for functions that append arrays.</div>
 </td>
 </tr>
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 <th class="colFirst" scope="col">Constructor</th>
 <th class="colLast" scope="col">Description</th>
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 <tr class="altColor">
 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">UdfTest</a></span>()</code></th>
 <td class="colLast">&nbsp;</td>
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 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colSecond" scope="col">Method</th>
 <th class="colLast" scope="col">Description</th>
 </tr>
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 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testArrayUserDefinedFunction()">testArrayUserDefinedFunction</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1834">[CALCITE-1834]
  User-defined function for Arrays</a>.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testBigDecimalAndLong()">testBigDecimalAndLong</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-2053">[CALCITE-2053]
  Overloaded user-defined functions that have Double and BigDecimal arguments
  will goes wrong </a>.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testDate()">testDate</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-986">[CALCITE-986]
  User-defined function with Date or Timestamp parameters</a>.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testDateAndTimestamp()">testDateAndTimestamp</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1881">[CALCITE-1881]
  Can't distinguish overloaded user-defined functions that have DATE and
  TIMESTAMP arguments</a>.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testNotNullImplementor()">testNotNullImplementor</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests that IS NULL/IS NOT NULL is properly implemented for non-strict
  functions.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testPath()">testPath</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests resolution of functions using schema paths.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testReturnDate()">testReturnDate</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1041">[CALCITE-1041]
  User-defined function returns DATE or TIMESTAMP value</a>.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testReturnDate2()">testReturnDate2</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1041">[CALCITE-1041]
  User-defined function returns DATE or TIMESTAMP value</a>.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testSemiStrict()">testSemiStrict</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests that we generate the appropriate checks for a "semi-strict"
  function.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUdfArgumentName()">testUdfArgumentName</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests passing parameters to user-defined function by name.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUdfArgumentOptional()">testUdfArgumentOptional</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests calling a user-defined function some of whose parameters are
  optional.</div>
 </td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUdfDerivedReturnType()">testUdfDerivedReturnType</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests derived return type of user-defined function.</div>
 </td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUdfOverloaded()">testUdfOverloaded</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests a user-defined function that has multiple overloads.</div>
 </td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUdfOverloadedNullable()">testUdfOverloadedNullable</a></span>()</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedAggregateFunction()">testUserDefinedAggregateFunction</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests user-defined aggregate function.</div>
 </td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedAggregateFunction3()">testUserDefinedAggregateFunction3</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test for
  <code>CalciteResource.firstParameterOfAdd(String)</code>.</div>
 </td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedAggregateFunctionImplementsInterface()">testUserDefinedAggregateFunctionImplementsInterface</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1434">[CALCITE-1434]
  AggregateFunctionImpl doesnt work if the class implements a generic
  interface</a>.</div>
 </td>
 </tr>
 <tr id="i17" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedAggregateFunctionWithFilter()">testUserDefinedAggregateFunctionWithFilter</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests user-defined aggregate function with FILTER.</div>
 </td>
 </tr>
 <tr id="i18" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedAggregateFunctionWithMultipleParameters()">testUserDefinedAggregateFunctionWithMultipleParameters</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests user-defined aggregate function.</div>
 </td>
 </tr>
 <tr id="i19" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedFunction()">testUserDefinedFunction</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests a user-defined function that is defined in terms of a class with
  non-static methods.</div>
 </td>
 </tr>
 <tr id="i20" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedFunction2()">testUserDefinedFunction2</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test for
  <code>CalciteResource.requireDefaultConstructor(String)</code>.</div>
 </td>
 </tr>
 <tr id="i21" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedFunctionB()">testUserDefinedFunctionB</a></span>()</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i22" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedFunctionInstanceCount()">testUserDefinedFunctionInstanceCount</a></span>()</code></th>
 <td class="colLast">
 <div class="block">As <a href="#testUserDefinedFunction()"><code>testUserDefinedFunction()</code></a>, but checks that the class is
  instantiated exactly once, per
  <a href="https://issues.apache.org/jira/browse/CALCITE-1548">[CALCITE-1548]
  Instantiate function objects once per query</a>.</div>
 </td>
 </tr>
 <tr id="i23" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedFunctionInView()">testUserDefinedFunctionInView</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-937">[CALCITE-937]
  User-defined function within view</a>.</div>
 </td>
 </tr>
 <tr id="i24" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#testUserDefinedFunctionWithMethodName()">testUserDefinedFunctionWithMethodName</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Tests user-defined function, with multiple methods per class.</div>
 </td>
 </tr>
 <tr id="i25" class="rowColor">
 <td class="colFirst"><code>private static <a href="CalciteAssert.AssertThat.html" title="class in org.apache.calcite.test">CalciteAssert.AssertThat</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#withBadUdf(java.lang.Class)">withBadUdf</a></span>&#8203;(java.lang.Class&nbsp;clazz)</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 <tr id="i26" class="altColor">
 <td class="colFirst"><code>private <a href="CalciteAssert.AssertThat.html" title="class in org.apache.calcite.test">CalciteAssert.AssertThat</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#withUdf()">withUdf</a></span>()</code></th>
 <td class="colLast">&nbsp;</td>
 </tr>
 </table>
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 <!--   -->
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 <h3>Methods inherited from class&nbsp;java.lang.Object</h3>
 <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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 <h4>UdfTest</h4>
 <pre>public&nbsp;UdfTest()</pre>
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 <h4>withUdf</h4>
 <pre class="methodSignature">private&nbsp;<a href="CalciteAssert.AssertThat.html" title="class in org.apache.calcite.test">CalciteAssert.AssertThat</a>&nbsp;withUdf()</pre>
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 <h4>testUserDefinedFunction</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedFunction()
                              throws java.lang.Exception</pre>
 <div class="block">Tests a user-defined function that is defined in terms of a class with
  non-static methods.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
 </dl>
 </li>
 </ul>
 <a id="testUserDefinedFunctionInstanceCount()">
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 <h4>testUserDefinedFunctionInstanceCount</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedFunctionInstanceCount()
                                           throws java.lang.Exception</pre>
 <div class="block">As <a href="#testUserDefinedFunction()"><code>testUserDefinedFunction()</code></a>, but checks that the class is
  instantiated exactly once, per
  <a href="https://issues.apache.org/jira/browse/CALCITE-1548">[CALCITE-1548]
  Instantiate function objects once per query</a>.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
 </dl>
 </li>
 </ul>
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 <h4>testUserDefinedFunctionB</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedFunctionB()
                               throws java.lang.Exception</pre>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
 </dl>
 </li>
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 <h4>testUserDefinedFunctionInView</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedFunctionInView()
                                    throws java.lang.Exception</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-937">[CALCITE-937]
  User-defined function within view</a>.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
 </dl>
 </li>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testNotNullImplementor()</pre>
 <div class="block">Tests that IS NULL/IS NOT NULL is properly implemented for non-strict
  functions.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testSemiStrict()</pre>
 <div class="block">Tests that we generate the appropriate checks for a "semi-strict"
  function.

  <p>The difference between "strict" and "semi-strict" functions is that a
  "semi-strict" function might return null even if none of its arguments
  are null. (Both always return null if one of their arguments is null.)
  Thus, a nasty function is more unpredictable.</div>
 <dl>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><code>SemiStrict</code></dd>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUdfDerivedReturnType()</pre>
 <div class="block">Tests derived return type of user-defined function.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUdfOverloaded()</pre>
 <div class="block">Tests a user-defined function that has multiple overloads.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUdfArgumentName()</pre>
 <div class="block">Tests passing parameters to user-defined function by name.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUdfArgumentOptional()</pre>
 <div class="block">Tests calling a user-defined function some of whose parameters are
  optional.</div>
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 <h4>testUserDefinedFunction2</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedFunction2()
                               throws java.lang.Exception</pre>
 <div class="block">Test for
  <code>CalciteResource.requireDefaultConstructor(String)</code>.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedFunctionWithMethodName()
                                            throws java.lang.Exception</pre>
 <div class="block">Tests user-defined function, with multiple methods per class.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedAggregateFunction()
                                       throws java.lang.Exception</pre>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedAggregateFunctionWithMultipleParameters()
                                                             throws java.lang.Exception</pre>
 <div class="block">Tests user-defined aggregate function.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedAggregateFunction3()
                                        throws java.lang.Exception</pre>
 <div class="block">Test for
  <code>CalciteResource.firstParameterOfAdd(String)</code>.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedAggregateFunctionImplementsInterface()</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1434">[CALCITE-1434]
  AggregateFunctionImpl doesnt work if the class implements a generic
  interface</a>.</div>
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 <pre class="methodSignature">private static&nbsp;<a href="CalciteAssert.AssertThat.html" title="class in org.apache.calcite.test">CalciteAssert.AssertThat</a>&nbsp;withBadUdf&#8203;(java.lang.Class&nbsp;clazz)</pre>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testUserDefinedAggregateFunctionWithFilter()
                                                 throws java.lang.Exception</pre>
 <div class="block">Tests user-defined aggregate function with FILTER.

  <p>Also tests that we do not try to push ADAF to JDBC source.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testPath()
               throws java.lang.Exception</pre>
 <div class="block">Tests resolution of functions using schema paths.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testDate()</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-986">[CALCITE-986]
  User-defined function with Date or Timestamp parameters</a>.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testReturnDate()</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1041">[CALCITE-1041]
  User-defined function returns DATE or TIMESTAMP value</a>.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testDateAndTimestamp()</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1881">[CALCITE-1881]
  Can't distinguish overloaded user-defined functions that have DATE and
  TIMESTAMP arguments</a>.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testBigDecimalAndLong()</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-2053">[CALCITE-2053]
  Overloaded user-defined functions that have Double and BigDecimal arguments
  will goes wrong </a>.</div>
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 <pre class="methodSignature">public&nbsp;void&nbsp;testReturnDate2()</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1041">[CALCITE-1041]
  User-defined function returns DATE or TIMESTAMP value</a>.</div>
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 <h4>testArrayUserDefinedFunction</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;testArrayUserDefinedFunction()
                                   throws java.lang.Exception</pre>
 <div class="block">Test case for
  <a href="https://issues.apache.org/jira/browse/CALCITE-1834">[CALCITE-1834]
  User-defined function for Arrays</a>.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.Exception</code></dd>
 </dl>
 </li>
 </ul>
 </li>
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