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| <h2 title="接口 HintPredicate" class="title">接口 HintPredicate</h2> |
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| <dt>所有已知实现类:</dt> |
| <dd><a href="../../../../../org/apache/calcite/rel/hint/CompositeHintPredicate.html" title="org.apache.calcite.rel.hint中的类">CompositeHintPredicate</a>, <a href="../../../../../org/apache/calcite/rel/hint/NodeTypeHintPredicate.html" title="org.apache.calcite.rel.hint中的类">NodeTypeHintPredicate</a></dd> |
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| <pre>public interface <span class="typeNameLabel">HintPredicate</span></pre> |
| <div class="block">A <code>HintPredicate</code> indicates whether a <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口"><code>RelNode</code></a> |
| can apply the specified hint. |
| |
| <p>Every supported hint should register a <code>HintPredicate</code> |
| into the <a href="../../../../../org/apache/calcite/rel/hint/HintStrategyTable.html" title="org.apache.calcite.rel.hint中的类"><code>HintStrategyTable</code></a>. For example, <a href="../../../../../org/apache/calcite/rel/hint/HintPredicates.html#JOIN"><code>HintPredicates.JOIN</code></a> implies |
| that this hint would be propagated and applied to the <a href="../../../../../org/apache/calcite/rel/core/Join.html" title="org.apache.calcite.rel.core中的类"><code>Join</code></a> |
| relational expressions. |
| |
| <p>Usually use <a href="../../../../../org/apache/calcite/rel/hint/NodeTypeHintPredicate.html" title="org.apache.calcite.rel.hint中的类"><code>NodeTypeHintPredicate</code></a> is enough for most of the <a href="../../../../../org/apache/calcite/rel/hint/RelHint.html" title="org.apache.calcite.rel.hint中的类"><code>RelHint</code></a>s. |
| Some of the hints can only be matched to the relational expression with special |
| match conditions(not only the relational expression type). |
| i.e. "hash_join(r, st)", this hint can only be applied to JOIN expression that |
| has "r" and "st" as the input table names. To implement this, you can make a custom |
| <code>HintPredicate</code> instance. |
| |
| <p>A <code>HintPredicate</code> can be used independently or cascaded with other strategies |
| with method <a href="../../../../../org/apache/calcite/rel/hint/HintPredicates.html#and-org.apache.calcite.rel.hint.HintPredicate...-"><code>HintPredicates.and(org.apache.calcite.rel.hint.HintPredicate...)</code></a>. |
| |
| <p>In <a href="../../../../../org/apache/calcite/rel/hint/HintStrategyTable.html" title="org.apache.calcite.rel.hint中的类"><code>HintStrategyTable</code></a> the predicate is used for |
| hints registration.</div> |
| <dl> |
| <dt><span class="seeLabel">另请参阅:</span></dt> |
| <dd><a href="../../../../../org/apache/calcite/rel/hint/HintStrategyTable.html" title="org.apache.calcite.rel.hint中的类"><code>HintStrategyTable</code></a></dd> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/HintPredicate.html#apply-org.apache.calcite.rel.hint.RelHint-org.apache.calcite.rel.RelNode-">apply</a></span>(<a href="../../../../../org/apache/calcite/rel/hint/RelHint.html" title="org.apache.calcite.rel.hint中的类">RelHint</a> hint, |
| <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a> rel)</code> |
| <div class="block">Decides if the given <code>hint</code> can be applied to |
| the relational expression <code>rel</code>.</div> |
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| <h4>apply</h4> |
| <pre>boolean apply(<a href="../../../../../org/apache/calcite/rel/hint/RelHint.html" title="org.apache.calcite.rel.hint中的类">RelHint</a> hint, |
| <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口">RelNode</a> rel)</pre> |
| <div class="block">Decides if the given <code>hint</code> can be applied to |
| the relational expression <code>rel</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>hint</code> - The hint</dd> |
| <dd><code>rel</code> - The relational expression</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>True if the <code>hint</code> can be applied to the <code>rel</code></dd> |
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