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| <li>Summary: </li> |
| <li>Nested | </li> |
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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.schema</a></div> |
| <h1 title="Interface Member" class="title">Interface Member</h1> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">Member</span></div> |
| <div class="block">A named expression in a schema. |
| |
| <h2>Examples of members</h2> |
| |
| <p>Several kinds of members crop up in real life. They all implement the |
| <code>Member</code> interface, but tend to be treated differently by the |
| back-end system if not by Calcite.</p> |
| |
| <p>A member that has zero arguments and a type that is a collection of |
| records is referred to as a <i>relation</i>. In schemas backed by a |
| relational database, tables and views will appear as relations.</p> |
| |
| <p>A member that has one or more arguments and a type that is a collection |
| of records is referred to as a <i>parameterized relation</i>. Some relational |
| databases support these; for example, Oracle calls them "table |
| functions".</p> |
| |
| <p>Members may be also more typical of programming-language functions: |
| they take zero or more arguments, and return a result of arbitrary type.</p> |
| |
| <p>From the above definitions, you can see that a member is a special |
| kind of function. This makes sense, because even though it has no |
| arguments, it is "evaluated" each time it is used in a query.</p></div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ========== 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-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-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract 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-tab3"><code><a href="../linq4j/Queryable.html" title="interface in org.apache.calcite.linq4j">Queryable</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#evaluate(java.lang.Object,java.util.List)" class="member-name-link">evaluate</a><wbr>(<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> schemaInstance, |
| <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><<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>> arguments)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Evaluates this member to yield a result.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getName()" class="member-name-link">getName</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">The name of this function.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><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><<a href="FunctionParameter.html" title="interface in org.apache.calcite.schema">FunctionParameter</a>></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getParameters()" class="member-name-link">getParameters</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Returns the parameters of this member.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getType()" class="member-name-link">getType</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Returns the type of this function's result.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="getName()"> |
| <h3>getName</h3> |
| <div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span> <span class="element-name">getName</span>()</div> |
| <div class="block">The name of this function.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getParameters()"> |
| <h3>getParameters</h3> |
| <div class="member-signature"><span class="return-type"><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><<a href="FunctionParameter.html" title="interface in org.apache.calcite.schema">FunctionParameter</a>></span> <span class="element-name">getParameters</span>()</div> |
| <div class="block">Returns the parameters of this member.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>Parameters; never null</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getType()"> |
| <h3>getType</h3> |
| <div class="member-signature"><span class="return-type"><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></span> <span class="element-name">getType</span>()</div> |
| <div class="block">Returns the type of this function's result.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>Type of result; never null</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="evaluate(java.lang.Object,java.util.List)"> |
| <h3>evaluate</h3> |
| <div class="member-signature"><span class="return-type"><a href="../linq4j/Queryable.html" title="interface in org.apache.calcite.linq4j">Queryable</a></span> <span class="element-name">evaluate</span><wbr><span class="parameters">(<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> schemaInstance, |
| <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><<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>> arguments)</span></div> |
| <div class="block">Evaluates this member to yield a result. The result is a |
| <a href="../linq4j/Queryable.html" title="interface in org.apache.calcite.linq4j"><code>Queryable</code></a>.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>schemaInstance</code> - Object that is an instance of the containing |
| <a href="Schema.html" title="interface in org.apache.calcite.schema"><code>Schema</code></a></dd> |
| <dd><code>arguments</code> - List of arguments to the call; must match |
| <a href="#getParameters()"><code>parameters</code></a> in number and type</dd> |
| <dt>Returns:</dt> |
| <dd>An instance of this schema object, as a Queryable</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
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