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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.plan</a></div> |
| <h2 title="Interface RelOptCost" class="title">Interface RelOptCost</h2> |
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| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="RelOptCostImpl.html" title="class in org.apache.calcite.plan">RelOptCostImpl</a></code>, <code><a href="volcano/VolcanoCost.html" title="class in org.apache.calcite.plan.volcano">VolcanoCost</a></code></dd> |
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| <hr> |
| <pre>public interface <span class="typeNameLabel">RelOptCost</span></pre> |
| <div class="block">RelOptCost defines an interface for optimizer cost in terms of number of rows |
| processed, CPU cost, and I/O cost. Optimizer implementations may use all of |
| this information, or selectively ignore portions of it. The specific units |
| for all of these quantities are rather vague; most relational expressions |
| provide a default cost calculation, but optimizers can override this by |
| plugging in their own cost models with well-defined meanings for each unit. |
| Optimizers which supply their own cost models may also extend this interface |
| with additional cost metrics such as memory usage.</div> |
| </li> |
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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>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#divideBy(org.apache.calcite.plan.RelOptCost)">divideBy</a></span>​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</code></th> |
| <td class="colLast"> |
| <div class="block">Computes the ratio between this cost and another cost.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equals(org.apache.calcite.plan.RelOptCost)">equals</a></span>​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</code></th> |
| <td class="colLast"> |
| <div class="block">Compares this to another cost.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCpu()">getCpu</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getIo()">getIo</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getRows()">getRows</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isEqWithEpsilon(org.apache.calcite.plan.RelOptCost)">isEqWithEpsilon</a></span>​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</code></th> |
| <td class="colLast"> |
| <div class="block">Compares this to another cost, allowing for slight roundoff errors.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isInfinite()">isInfinite</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isLe(org.apache.calcite.plan.RelOptCost)">isLe</a></span>​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</code></th> |
| <td class="colLast"> |
| <div class="block">Compares this to another cost.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isLt(org.apache.calcite.plan.RelOptCost)">isLt</a></span>​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</code></th> |
| <td class="colLast"> |
| <div class="block">Compares this to another cost.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#minus(org.apache.calcite.plan.RelOptCost)">minus</a></span>​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</code></th> |
| <td class="colLast"> |
| <div class="block">Subtracts another cost from this.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#multiplyBy(double)">multiplyBy</a></span>​(double factor)</code></th> |
| <td class="colLast"> |
| <div class="block">Multiplies this cost by a scalar factor.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code><a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#plus(org.apache.calcite.plan.RelOptCost)">plus</a></span>​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</code></th> |
| <td class="colLast"> |
| <div class="block">Adds another cost to this.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Forces implementations to override <code>Object.toString()</code> and provide a |
| good cost rendering to use during tracing.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a id="getRows()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getRows</h4> |
| <pre class="methodSignature">double getRows()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of rows processed; this should not be confused with the |
| row count produced by a relational expression |
| (<a href="../rel/RelNode.html#estimateRowCount(org.apache.calcite.rel.metadata.RelMetadataQuery)"><code>RelNode.estimateRowCount(org.apache.calcite.rel.metadata.RelMetadataQuery)</code></a>)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getCpu()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCpu</h4> |
| <pre class="methodSignature">double getCpu()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>usage of CPU resources</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getIo()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getIo</h4> |
| <pre class="methodSignature">double getIo()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>usage of I/O resources</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isInfinite()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isInfinite</h4> |
| <pre class="methodSignature">boolean isInfinite()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true iff this cost represents an expression that hasn't actually |
| been implemented (e.g. a pure relational algebra expression) or can't |
| actually be implemented, e.g. a transfer of data between two disconnected |
| sites</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="equals(org.apache.calcite.plan.RelOptCost)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>equals</h4> |
| <pre class="methodSignature">boolean equals​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</pre> |
| <div class="block">Compares this to another cost.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cost</code> - another cost</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true iff this is exactly equal to other cost</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isEqWithEpsilon(org.apache.calcite.plan.RelOptCost)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isEqWithEpsilon</h4> |
| <pre class="methodSignature">boolean isEqWithEpsilon​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</pre> |
| <div class="block">Compares this to another cost, allowing for slight roundoff errors.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cost</code> - another cost</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true iff this is the same as the other cost within a roundoff |
| margin of error</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isLe(org.apache.calcite.plan.RelOptCost)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isLe</h4> |
| <pre class="methodSignature">boolean isLe​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</pre> |
| <div class="block">Compares this to another cost.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cost</code> - another cost</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true iff this is less than or equal to other cost</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isLt(org.apache.calcite.plan.RelOptCost)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isLt</h4> |
| <pre class="methodSignature">boolean isLt​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</pre> |
| <div class="block">Compares this to another cost.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cost</code> - another cost</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true iff this is strictly less than other cost</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="plus(org.apache.calcite.plan.RelOptCost)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>plus</h4> |
| <pre class="methodSignature"><a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> plus​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</pre> |
| <div class="block">Adds another cost to this.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cost</code> - another cost</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>sum of this and other cost</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="minus(org.apache.calcite.plan.RelOptCost)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>minus</h4> |
| <pre class="methodSignature"><a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> minus​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</pre> |
| <div class="block">Subtracts another cost from this.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cost</code> - another cost</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>difference between this and other cost</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="multiplyBy(double)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>multiplyBy</h4> |
| <pre class="methodSignature"><a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> multiplyBy​(double factor)</pre> |
| <div class="block">Multiplies this cost by a scalar factor.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>factor</code> - scalar factor</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>scalar product of this and factor</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="divideBy(org.apache.calcite.plan.RelOptCost)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>divideBy</h4> |
| <pre class="methodSignature">double divideBy​(<a href="RelOptCost.html" title="interface in org.apache.calcite.plan">RelOptCost</a> cost)</pre> |
| <div class="block">Computes the ratio between this cost and another cost. |
| |
| <p>divideBy is the inverse of <a href="#multiplyBy(double)"><code>multiplyBy(double)</code></a>. For any |
| finite, non-zero cost and factor f, <code> |
| cost.divideBy(cost.multiplyBy(f))</code> yields <code>1 / f</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cost</code> - Other cost</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Ratio between costs</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="toString()"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>toString</h4> |
| <pre class="methodSignature">java.lang.String toString()</pre> |
| <div class="block">Forces implementations to override <code>Object.toString()</code> and provide a |
| good cost rendering to use during tracing.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>toString</code> in class <code>java.lang.Object</code></dd> |
| </dl> |
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| <li>Summary: </li> |
| <li>Nested | </li> |
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