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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.metadata</a></div> |
| <h1 title="Interface BuiltInMetadata.Memory" class="title">Interface BuiltInMetadata.Memory</h1> |
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| <section class="description"> |
| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></code></dd> |
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| <dl> |
| <dt>Enclosing class:</dt> |
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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.Memory</span> |
| extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></pre> |
| <div class="block">Metadata about the memory use of an operator.</div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BuiltInMetadata.Memory.Handler.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Memory.Handler</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Handler API.</div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>static <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.Memory.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Memory</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEF">DEF</a></span></code></th> |
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| <td class="colFirst"><code>@Nullable <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang" class="externalLink">Double</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#cumulativeMemoryWithinPhase()">cumulativeMemoryWithinPhase</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the cumulative amount of memory, in bytes, required by the |
| physical operator implementing this relational expression, and all other |
| operators within the same phase, across all splits.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code>@Nullable <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang" class="externalLink">Double</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#cumulativeMemoryWithinPhaseSplit()">cumulativeMemoryWithinPhaseSplit</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the expected cumulative amount of memory, in bytes, required by |
| the physical operator implementing this relational expression, and all |
| operators within the same phase, within each split.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <td class="colFirst"><code>@Nullable <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang" class="externalLink">Double</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#memory()">memory</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the expected amount of memory, in bytes, required by a physical |
| operator implementing this relational expression, across all splits.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
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| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from interface org.apache.calcite.rel.metadata.<a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></h3> |
| <a id="methods.inherited.from.class.org.apache.calcite.rel.metadata.Metadata"> |
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| </a><code><a href="Metadata.html#rel()">rel</a></code></div> |
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| <h3><a id="DEF">DEF</a></h3> |
| <div class="memberSignature"><span class="modifiers">static final</span> <span class="returnType"><a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.Memory.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.Memory</a>></span> <span class="memberName">DEF</span></div> |
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| <h3><a id="memory()">memory</a></h3> |
| <div class="memberSignature"><span class="returnType">@Nullable <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang" class="externalLink">Double</a></span> <span class="memberName">memory</span>()</div> |
| <div class="block">Returns the expected amount of memory, in bytes, required by a physical |
| operator implementing this relational expression, across all splits. |
| |
| <p>How much memory is used depends very much on the algorithm; for |
| example, an implementation of |
| <a href="../core/Aggregate.html" title="class in org.apache.calcite.rel.core"><code>Aggregate</code></a> that loads all data into a |
| hash table requires approximately <code>rowCount * averageRowSize</code> |
| bytes, whereas an implementation that assumes that the input is sorted |
| requires only <code>averageRowSize</code> bytes to maintain a single |
| accumulator for each aggregate function.</div> |
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| <h3><a id="cumulativeMemoryWithinPhase()">cumulativeMemoryWithinPhase</a></h3> |
| <div class="memberSignature"><span class="returnType">@Nullable <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang" class="externalLink">Double</a></span> <span class="memberName">cumulativeMemoryWithinPhase</span>()</div> |
| <div class="block">Returns the cumulative amount of memory, in bytes, required by the |
| physical operator implementing this relational expression, and all other |
| operators within the same phase, across all splits.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="BuiltInMetadata.Parallelism.html#splitCount()"><code>BuiltInMetadata.Parallelism.splitCount()</code></a></dd> |
| </dl> |
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| <h3><a id="cumulativeMemoryWithinPhaseSplit()">cumulativeMemoryWithinPhaseSplit</a></h3> |
| <div class="memberSignature"><span class="returnType">@Nullable <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang" class="externalLink">Double</a></span> <span class="memberName">cumulativeMemoryWithinPhaseSplit</span>()</div> |
| <div class="block">Returns the expected cumulative amount of memory, in bytes, required by |
| the physical operator implementing this relational expression, and all |
| operators within the same phase, within each split. |
| |
| <p>Basic formula: |
| |
| <blockquote>cumulativeMemoryWithinPhaseSplit |
| = cumulativeMemoryWithinPhase / Parallelism.splitCount</blockquote></div> |
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