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| <h2 title="Enum DeriveMode" class="title">Enum DeriveMode</h2> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">java.lang.Enum</a><<a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a>></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.plan.DeriveMode</li> |
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| <pre>public enum <span class="typeNameLabel">DeriveMode</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a><<a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a>></pre> |
| <div class="block">The mode of trait derivation.</div> |
| </li> |
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| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Enum Constant and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/DeriveMode.html#BOTH">BOTH</a></span></code> |
| <div class="block">Iterates over each child, uses current child's traits |
| to decide what traits to require from the other |
| children.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/DeriveMode.html#LEFT_FIRST">LEFT_FIRST</a></span></code> |
| <div class="block">Uses the left most child's traits to decide what |
| traits to require from the other children.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/DeriveMode.html#OMAKASE">OMAKASE</a></span></code> |
| <div class="block">Leave it to you, you decide what you cook.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/DeriveMode.html#PROHIBITED">PROHIBITED</a></span></code> |
| <div class="block">Trait derivation is prohibited.</div> |
| </td> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/DeriveMode.html#RIGHT_FIRST">RIGHT_FIRST</a></span></code> |
| <div class="block">Uses the right most child's traits to decide what |
| traits to require from the other children.</div> |
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| <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/DeriveMode.html#valueOf-java.lang.String-">valueOf</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</code> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/plan/DeriveMode.html#values--">values</a></span>()</code> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
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| <a name="LEFT_FIRST"> |
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| <h4>LEFT_FIRST</h4> |
| <pre>public static final <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a> LEFT_FIRST</pre> |
| <div class="block">Uses the left most child's traits to decide what |
| traits to require from the other children. This |
| generally applies to most operators.</div> |
| </li> |
| </ul> |
| <a name="RIGHT_FIRST"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>RIGHT_FIRST</h4> |
| <pre>public static final <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a> RIGHT_FIRST</pre> |
| <div class="block">Uses the right most child's traits to decide what |
| traits to require from the other children. Operators |
| like index nested loop join may find this useful.</div> |
| </li> |
| </ul> |
| <a name="BOTH"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>BOTH</h4> |
| <pre>public static final <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a> BOTH</pre> |
| <div class="block">Iterates over each child, uses current child's traits |
| to decide what traits to require from the other |
| children. It includes both LEFT_FIRST and RIGHT_FIRST. |
| System that doesn't enable join commutativity should |
| consider this option. Special customized operators |
| like a Join who has 3 inputs may find this useful too.</div> |
| </li> |
| </ul> |
| <a name="OMAKASE"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>OMAKASE</h4> |
| <pre>public static final <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a> OMAKASE</pre> |
| <div class="block">Leave it to you, you decide what you cook. This will |
| allow planner to pass all the traits from all the |
| children, the user decides how to make use of these |
| traits and whether to derive new rel nodes.</div> |
| </li> |
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| <h4>PROHIBITED</h4> |
| <pre>public static final <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a> PROHIBITED</pre> |
| <div class="block">Trait derivation is prohibited.</div> |
| </li> |
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| <a name="values--"> |
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| <h4>values</h4> |
| <pre>public static <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a>[] values()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (DeriveMode c : DeriveMode.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
| </dl> |
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| <h4>valueOf</h4> |
| <pre>public static <a href="../../../../org/apache/calcite/plan/DeriveMode.html" title="enum in org.apache.calcite.plan">DeriveMode</a> valueOf(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd> |
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