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<h2 title="接口 InitializerExpressionFactory" class="title">接口 InitializerExpressionFactory</h2>
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<dt>所有已知实现类:</dt>
<dd><a href="../../../../org/apache/calcite/sql2rel/NullInitializerExpressionFactory.html" title="org.apache.calcite.sql2rel中的类">NullInitializerExpressionFactory</a></dd>
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<pre>public interface <span class="typeNameLabel">InitializerExpressionFactory</span></pre>
<div class="block">InitializerExpressionFactory supplies default values for INSERT, UPDATE, and NEW.</div>
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<h3>方法概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释">
<caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">已过时的方法</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">方法和说明</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/schema/ColumnStrategy.html" title="org.apache.calcite.schema中的枚举">ColumnStrategy</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/InitializerExpressionFactory.html#generationStrategy-org.apache.calcite.plan.RelOptTable-int-">generationStrategy</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="org.apache.calcite.plan中的接口">RelOptTable</a>&nbsp;table,
int&nbsp;iColumn)</code>
<div class="block">Returns how a column is populated.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/InitializerExpressionFactory.html#isGeneratedAlways-org.apache.calcite.plan.RelOptTable-int-">isGeneratedAlways</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="org.apache.calcite.plan中的接口">RelOptTable</a>&nbsp;table,
int&nbsp;iColumn)</code>
<div class="block"><span class="deprecatedLabel">已过时。</span>&nbsp;
<div class="block"><span class="deprecationComment">Use <code>c.generationStrategy(t, i) == VIRTUAL
|| c.generationStrategy(t, i) == STORED</code></span></div>
</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/InitializerExpressionFactory.html#newAttributeInitializer-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.sql.SqlFunction-int-java.util.List-org.apache.calcite.sql2rel.InitializerContext-">newAttributeInitializer</a></span>(<a href="../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;type,
<a href="../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a>&nbsp;constructor,
int&nbsp;iAttribute,
<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/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;constructorArgs,
<a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html" title="org.apache.calcite.sql2rel中的接口">InitializerContext</a>&nbsp;context)</code>
<div class="block">Creates an expression which evaluates to the initializer expression for a
particular attribute of a structured type.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/InitializerExpressionFactory.html#newColumnDefaultValue-org.apache.calcite.plan.RelOptTable-int-org.apache.calcite.sql2rel.InitializerContext-">newColumnDefaultValue</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="org.apache.calcite.plan中的接口">RelOptTable</a>&nbsp;table,
int&nbsp;iColumn,
<a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html" title="org.apache.calcite.sql2rel中的接口">InitializerContext</a>&nbsp;context)</code>
<div class="block">Creates an expression which evaluates to the default value for a
particular column.</div>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/BiFunction.html?is-external=true" title="java.util.function中的类或接口">BiFunction</a>&lt;<a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html" title="org.apache.calcite.sql2rel中的接口">InitializerContext</a>,<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>,<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/sql2rel/InitializerExpressionFactory.html#postExpressionConversionHook--">postExpressionConversionHook</a></span>()</code>
<div class="block">Creates a hook function to customize the relational expression right after the column
expressions are converted.</div>
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<h3>方法详细资料</h3>
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<h4>isGeneratedAlways</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="java.lang中的类或接口">@Deprecated</a>
boolean&nbsp;isGeneratedAlways(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="org.apache.calcite.plan中的接口">RelOptTable</a>&nbsp;table,
int&nbsp;iColumn)</pre>
<div class="block"><span class="deprecatedLabel">已过时。</span>&nbsp;<span class="deprecationComment">Use <code>c.generationStrategy(t, i) == VIRTUAL
|| c.generationStrategy(t, i) == STORED</code></span></div>
<div class="block">Whether a column is always generated. If a column is always generated,
then non-generated values cannot be inserted into the column.</div>
<dl>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><a href="../../../../org/apache/calcite/sql2rel/InitializerExpressionFactory.html#generationStrategy-org.apache.calcite.plan.RelOptTable-int-"><code>generationStrategy(RelOptTable, int)</code></a></dd>
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<h4>generationStrategy</h4>
<pre><a href="../../../../org/apache/calcite/schema/ColumnStrategy.html" title="org.apache.calcite.schema中的枚举">ColumnStrategy</a>&nbsp;generationStrategy(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="org.apache.calcite.plan中的接口">RelOptTable</a>&nbsp;table,
int&nbsp;iColumn)</pre>
<div class="block">Returns how a column is populated.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>table</code> - the table containing the column</dd>
<dd><code>iColumn</code> - the 0-based offset of the column in the table</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>generation strategy, never null</dd>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><a href="../../../../org/apache/calcite/plan/RelOptTable.html#getColumnStrategies--"><code>RelOptTable.getColumnStrategies()</code></a></dd>
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<h4>newColumnDefaultValue</h4>
<pre><a href="../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;newColumnDefaultValue(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="org.apache.calcite.plan中的接口">RelOptTable</a>&nbsp;table,
int&nbsp;iColumn,
<a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html" title="org.apache.calcite.sql2rel中的接口">InitializerContext</a>&nbsp;context)</pre>
<div class="block">Creates an expression which evaluates to the default value for a
particular column.
<p>If the default value comes from a un-validated <a href="../../../../org/apache/calcite/sql/SqlNode.html" title="org.apache.calcite.sql中的类"><code>SqlNode</code></a>,
make sure to invoke <a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html#validateExpression-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.sql.SqlNode-"><code>InitializerContext.validateExpression(org.apache.calcite.rel.type.RelDataType, org.apache.calcite.sql.SqlNode)</code></a> first before you actually
do the conversion with method <a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html#convertExpression-org.apache.calcite.sql.SqlNode-"><code>InitializerContext.convertExpression(org.apache.calcite.sql.SqlNode)</code></a>.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>table</code> - the table containing the column</dd>
<dd><code>iColumn</code> - the 0-based offset of the column in the table</dd>
<dd><code>context</code> - Context for creating the expression</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>default value expression</dd>
</dl>
</li>
</ul>
<a name="postExpressionConversionHook--">
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<h4>postExpressionConversionHook</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/BiFunction.html?is-external=true" title="java.util.function中的类或接口">BiFunction</a>&lt;<a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html" title="org.apache.calcite.sql2rel中的接口">InitializerContext</a>,<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>,<a href="../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a>&gt;&nbsp;postExpressionConversionHook()</pre>
<div class="block">Creates a hook function to customize the relational expression right after the column
expressions are converted. Usually the relational expression is a projection
above a table scan.</div>
<dl>
<dt><span class="returnLabel">返回:</span></dt>
<dd>a hook function to transform the relational expression
right after the column expression conversion to a customized one</dd>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><a href="../../../../org/apache/calcite/sql2rel/InitializerExpressionFactory.html#newColumnDefaultValue-org.apache.calcite.plan.RelOptTable-int-org.apache.calcite.sql2rel.InitializerContext-"><code>newColumnDefaultValue(RelOptTable, int, InitializerContext)</code></a></dd>
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</li>
</ul>
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<h4>newAttributeInitializer</h4>
<pre><a href="../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&nbsp;newAttributeInitializer(<a href="../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;type,
<a href="../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a>&nbsp;constructor,
int&nbsp;iAttribute,
<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/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>&gt;&nbsp;constructorArgs,
<a href="../../../../org/apache/calcite/sql2rel/InitializerContext.html" title="org.apache.calcite.sql2rel中的接口">InitializerContext</a>&nbsp;context)</pre>
<div class="block">Creates an expression which evaluates to the initializer expression for a
particular attribute of a structured type.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>type</code> - the structured type</dd>
<dd><code>constructor</code> - the constructor invoked to initialize the type</dd>
<dd><code>iAttribute</code> - the 0-based offset of the attribute in the type</dd>
<dd><code>constructorArgs</code> - arguments passed to the constructor invocation</dd>
<dd><code>context</code> - Context for creating the expression</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>default value expression</dd>
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