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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.schema</a></div> |
| <h2 title="Interface Member" class="title">Interface Member</h2> |
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| <pre>public interface <span class="typeNameLabel">Member</span></pre> |
| <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> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <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> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../linq4j/Queryable.html" title="interface in org.apache.calcite.linq4j">Queryable</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#evaluate(java.lang.Object,java.util.List)">evaluate</a></span>​(java.lang.Object schemaInstance, |
| java.util.List<java.lang.Object> arguments)</code></th> |
| <td class="colLast"> |
| <div class="block">Evaluates this member to yield a result.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getName()">getName</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">The name of this function.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>java.util.List<<a href="FunctionParameter.html" title="interface in org.apache.calcite.schema">FunctionParameter</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getParameters()">getParameters</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the parameters of this member.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getType()">getType</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the type of this function's result.</div> |
| </td> |
| </tr> |
| </table> |
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| <h4>getName</h4> |
| <pre class="methodSignature">java.lang.String getName()</pre> |
| <div class="block">The name of this function.</div> |
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| <h4>getParameters</h4> |
| <pre class="methodSignature">java.util.List<<a href="FunctionParameter.html" title="interface in org.apache.calcite.schema">FunctionParameter</a>> getParameters()</pre> |
| <div class="block">Returns the parameters of this member.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Parameters; never null</dd> |
| </dl> |
| </li> |
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| <h4>getType</h4> |
| <pre class="methodSignature"><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> getType()</pre> |
| <div class="block">Returns the type of this function's result.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Type of result; never null</dd> |
| </dl> |
| </li> |
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| <h4>evaluate</h4> |
| <pre class="methodSignature"><a href="../linq4j/Queryable.html" title="interface in org.apache.calcite.linq4j">Queryable</a> evaluate​(java.lang.Object schemaInstance, |
| java.util.List<java.lang.Object> arguments)</pre> |
| <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> |
| <dt><span class="paramLabel">Parameters:</span></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><span class="returnLabel">Returns:</span></dt> |
| <dd>An instance of this schema object, as a Queryable</dd> |
| </dl> |
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