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 <h2 title="类 Window.Group" class="title">类 Window.Group</h2>
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 <dl>
 <dt>封闭类:</dt>
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 <pre>public static class <span class="typeNameLabel">Window.Group</span>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></pre>
 <div class="block">Group of windowed aggregate calls that have the same window specification.

  <p>The specification is defined by an upper and lower bound, and
  also has zero or more partitioning columns.

  <p>A window is either logical or physical. A physical window is measured
  in terms of row count. A logical window is measured in terms of rows
  within a certain distance from the current sort key.

  <p>For example:

  <ul>
  <li><code>ROWS BETWEEN 10 PRECEDING and 5 FOLLOWING</code> is a physical
  window with an upper and lower bound;
  <li><code>RANGE BETWEEN INTERVAL '1' HOUR PRECEDING AND UNBOUNDED
  FOLLOWING</code> is a logical window with only a lower bound;
  <li><code>RANGE INTERVAL '10' MINUTES PRECEDING</code> (which is
  equivalent to <code>RANGE BETWEEN INTERVAL '10' MINUTES PRECEDING AND
  CURRENT ROW</code>) is a logical window with an upper and lower bound.
  </ul></div>
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 <th class="colFirst" scope="col">限定符和类型</th>
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 <tr class="altColor">
 <td class="colFirst"><code>com.google.common.collect.ImmutableList&lt;<a href="../../../../../org/apache/calcite/rel/core/Window.RexWinAggCall.html" title="org.apache.calcite.rel.core中的类">Window.RexWinAggCall</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/Window.Group.html#aggCalls">aggCalls</a></span></code>
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 <th class="colFirst" scope="col">限定符和类型</th>
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 <div class="block">Presents a view of the <a href="../../../../../org/apache/calcite/rel/core/Window.RexWinAggCall.html" title="org.apache.calcite.rel.core中的类"><code>Window.RexWinAggCall</code></a> list as a list of
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 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/Window.Group.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
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 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/Window.Group.html#isAlwaysNonEmpty--">isAlwaysNonEmpty</a></span>()</code>
 <div class="block">Returns if the window is guaranteed to have rows.</div>
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 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/core/Window.Group.html#toString--">toString</a></span>()</code>&nbsp;</td>
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 <pre>public final&nbsp;com.google.common.collect.ImmutableList&lt;<a href="../../../../../org/apache/calcite/rel/core/Window.RexWinAggCall.html" title="org.apache.calcite.rel.core中的类">Window.RexWinAggCall</a>&gt; aggCalls</pre>
 <div class="block">List of <a href="../../../../../org/apache/calcite/rel/core/Window.RexWinAggCall.html" title="org.apache.calcite.rel.core中的类"><code>Window.RexWinAggCall</code></a>
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 <pre>public&nbsp;Group(<a href="../../../../../org/apache/calcite/util/ImmutableBitSet.html" title="org.apache.calcite.util中的类">ImmutableBitSet</a>&nbsp;keys,
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 <pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>&nbsp;toString()</pre>
 <dl>
 <dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="java.lang中的类或接口">toString</a></code>&nbsp;在类中&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></code></dd>
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 <pre>public&nbsp;boolean&nbsp;isAlwaysNonEmpty()</pre>
 <div class="block">Returns if the window is guaranteed to have rows.
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  For instance sum(non-nullable) over (empty window) is NULL.</div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>true when the window is non-empty</dd>
 <dt><span class="seeLabel">另请参阅:</span></dt>
 <dd><a href="../../../../../org/apache/calcite/sql/SqlWindow.html#isAlwaysNonEmpty--"><code>SqlWindow.isAlwaysNonEmpty()</code></a>,
 <a href="../../../../../org/apache/calcite/sql/SqlOperatorBinding.html#getGroupCount--"><code>SqlOperatorBinding.getGroupCount()</code></a>,
 <a href="../../../../../org/apache/calcite/sql/validate/SqlValidatorImpl.html#resolveWindow-org.apache.calcite.sql.SqlNode-org.apache.calcite.sql.validate.SqlValidatorScope-boolean-"><code>SqlValidatorImpl.resolveWindow(org.apache.calcite.sql.SqlNode, org.apache.calcite.sql.validate.SqlValidatorScope, boolean)</code></a></dd>
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 <pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../../org/apache/calcite/rel/core/AggregateCall.html" title="org.apache.calcite.rel.core中的类">AggregateCall</a>&gt;&nbsp;getAggregateCalls(<a href="../../../../../org/apache/calcite/rel/core/Window.html" title="org.apache.calcite.rel.core中的类">Window</a>&nbsp;windowRel)</pre>
 <div class="block">Presents a view of the <a href="../../../../../org/apache/calcite/rel/core/Window.RexWinAggCall.html" title="org.apache.calcite.rel.core中的类"><code>Window.RexWinAggCall</code></a> list as a list of
  <a href="../../../../../org/apache/calcite/rel/core/AggregateCall.html" title="org.apache.calcite.rel.core中的类"><code>AggregateCall</code></a>.</div>
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