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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel</a></div> |
| <h2 title="Class RelRoot" class="title">Class RelRoot</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.rel.RelRoot</li> |
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| <pre>public class <span class="typeNameLabel">RelRoot</span> |
| extends java.lang.Object</pre> |
| <div class="block">Root of a tree of <a href="RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>. |
| |
| <p>One important reason that RelRoot exists is to deal with queries like |
| |
| <blockquote><code>SELECT name |
| FROM emp |
| ORDER BY empno DESC</code></blockquote> |
| |
| <p>Calcite knows that the result must be sorted, but cannot represent its |
| sort order as a collation, because <code>empno</code> is not a field in the |
| result. |
| |
| <p>Instead we represent this as |
| |
| <blockquote><code>RelRoot: { |
| rel: Sort($1 DESC) |
| Project(name, empno) |
| TableScan(EMP) |
| fields: [0] |
| collation: [1 DESC] |
| }</code></blockquote> |
| |
| <p>Note that the <code>empno</code> field is present in the result, but the |
| <code>fields</code> mask tells the consumer to throw it away. |
| |
| <p>Another use case is queries like this: |
| |
| <blockquote><code>SELECT name AS n, name AS n2, empno AS n |
| FROM emp</code></blockquote> |
| |
| <p>The there are multiple uses of the <code>name</code> field. and there are |
| multiple columns aliased as <code>n</code>. You can represent this as |
| |
| <blockquote><code>RelRoot: { |
| rel: Project(name, empno) |
| TableScan(EMP) |
| fields: [(0, "n"), (0, "n2"), (1, "n")] |
| collation: [] |
| }</code></blockquote></div> |
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| <h3>Field Summary</h3> |
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| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#collation">collation</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>com.google.common.collect.ImmutableList<<a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><java.lang.Integer,​java.lang.String>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fields">fields</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#kind">kind</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#rel">rel</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#validatedRowType">validatedRowType</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| </a> |
| <h3>Constructor Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.rel.RelNode,org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.SqlKind,java.util.List,org.apache.calcite.rel.RelCollation)">RelRoot</a></span>​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> validatedRowType, |
| <a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind, |
| java.util.List<<a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><java.lang.Integer,​java.lang.String>> fields, |
| <a href="RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a> collation)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a RelRoot.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
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| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isCollationTrivial()">isCollationTrivial</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNameTrivial()">isNameTrivial</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isRefTrivial()">isRefTrivial</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#of(org.apache.calcite.rel.RelNode,org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.SqlKind)">of</a></span>​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> rowType, |
| <a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a simple RelRoot.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#of(org.apache.calcite.rel.RelNode,org.apache.calcite.sql.SqlKind)">of</a></span>​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a simple RelRoot.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#project()">project</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the root relational expression, creating a <a href="logical/LogicalProject.html" title="class in org.apache.calcite.rel.logical"><code>LogicalProject</code></a> |
| if necessary to remove fields that are not needed.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#project(boolean)">project</a></span>​(boolean force)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the root relational expression as a <a href="logical/LogicalProject.html" title="class in org.apache.calcite.rel.logical"><code>LogicalProject</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#withCollation(org.apache.calcite.rel.RelCollation)">withCollation</a></span>​(<a href="RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a> collation)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#withKind(org.apache.calcite.sql.SqlKind)">withKind</a></span>​(<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a copy, assigning a new kind.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#withRel(org.apache.calcite.rel.RelNode)">withRel</a></span>​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a copy of this RelRoot, assigning a <a href="RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
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| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a id="rel"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>rel</h4> |
| <pre>public final <a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel</pre> |
| </li> |
| </ul> |
| <a id="validatedRowType"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>validatedRowType</h4> |
| <pre>public final <a href="type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> validatedRowType</pre> |
| </li> |
| </ul> |
| <a id="kind"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>kind</h4> |
| <pre>public final <a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind</pre> |
| </li> |
| </ul> |
| <a id="fields"> |
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| </a> |
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| <h4>fields</h4> |
| <pre>public final com.google.common.collect.ImmutableList<<a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><java.lang.Integer,​java.lang.String>> fields</pre> |
| </li> |
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| <a id="collation"> |
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| </a> |
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| <h4>collation</h4> |
| <pre>public final <a href="RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a> collation</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a id="<init>(org.apache.calcite.rel.RelNode,org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.SqlKind,java.util.List,org.apache.calcite.rel.RelCollation)"> |
| <!-- --> |
| </a> |
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| <li class="blockList"> |
| <h4>RelRoot</h4> |
| <pre>public RelRoot​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> validatedRowType, |
| <a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind, |
| java.util.List<<a href="../util/Pair.html" title="class in org.apache.calcite.util">Pair</a><java.lang.Integer,​java.lang.String>> fields, |
| <a href="RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a> collation)</pre> |
| <div class="block">Creates a RelRoot.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>validatedRowType</code> - Original row type returned by query validator</dd> |
| <dd><code>kind</code> - Type of query (SELECT, UPDATE, ...)</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ============ METHOD DETAIL ========== --> |
| <section role="region"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a id="of(org.apache.calcite.rel.RelNode,org.apache.calcite.sql.SqlKind)"> |
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| </a> |
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| <h4>of</h4> |
| <pre class="methodSignature">public static <a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a> of​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</pre> |
| <div class="block">Creates a simple RelRoot.</div> |
| </li> |
| </ul> |
| <a id="of(org.apache.calcite.rel.RelNode,org.apache.calcite.rel.type.RelDataType,org.apache.calcite.sql.SqlKind)"> |
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| </a> |
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| <h4>of</h4> |
| <pre class="methodSignature">public static <a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a> of​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> rowType, |
| <a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</pre> |
| <div class="block">Creates a simple RelRoot.</div> |
| </li> |
| </ul> |
| <a id="toString()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>toString</h4> |
| <pre class="methodSignature">public java.lang.String toString()</pre> |
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| <dd><code>toString</code> in class <code>java.lang.Object</code></dd> |
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| <h4>withRel</h4> |
| <pre class="methodSignature">public <a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a> withRel​(<a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel)</pre> |
| <div class="block">Creates a copy of this RelRoot, assigning a <a href="RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>.</div> |
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| <pre class="methodSignature">public <a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a> withKind​(<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</pre> |
| <div class="block">Creates a copy, assigning a new kind.</div> |
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| <pre class="methodSignature">public <a href="RelRoot.html" title="class in org.apache.calcite.rel">RelRoot</a> withCollation​(<a href="RelCollation.html" title="interface in org.apache.calcite.rel">RelCollation</a> collation)</pre> |
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| <h4>project</h4> |
| <pre class="methodSignature">public <a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> project()</pre> |
| <div class="block">Returns the root relational expression, creating a <a href="logical/LogicalProject.html" title="class in org.apache.calcite.rel.logical"><code>LogicalProject</code></a> |
| if necessary to remove fields that are not needed.</div> |
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| <pre class="methodSignature">public <a href="RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> project​(boolean force)</pre> |
| <div class="block">Returns the root relational expression as a <a href="logical/LogicalProject.html" title="class in org.apache.calcite.rel.logical"><code>LogicalProject</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>force</code> - Create a Project even if all fields are used</dd> |
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