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| <li>Summary: </li> |
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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.rel.rules</a></div> |
| <h1 title="Class PushProjector" class="title">Class PushProjector</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.rel.rules.PushProjector</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">PushProjector</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <div class="block">PushProjector is a utility class used to perform operations used in push |
| projection rules. |
| |
| <p>Pushing is particularly interesting in the case of join, because there |
| are multiple inputs. Generally an expression can be pushed down to a |
| particular input if it depends upon no other inputs. If it can be pushed |
| down to both sides, it is pushed down to the left. |
| |
| <p>Sometimes an expression needs to be split before it can be pushed down. |
| To flag that an expression cannot be split, specify a rule that it must be |
| <dfn>preserved</dfn>. Such an expression will be pushed down intact to one |
| of the inputs, or not pushed down at all.</p></div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
| <li> |
| <section class="nested-class-summary" id="nested-class-summary"> |
| <h2>Nested Class Summary</h2> |
| <div class="caption"><span>Nested Classes</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Class</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>static interface </code></div> |
| <div class="col-second even-row-color"><code><a href="PushProjector.ExprCondition.html" class="type-name-link" title="interface in org.apache.calcite.rel.rules">PushProjector.ExprCondition</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">A functor that replies true or false for a given expression.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(org.apache.calcite.rel.core.Project,org.apache.calcite.rex.RexNode,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.rules.PushProjector.ExprCondition,org.apache.calcite.tools.RelBuilder)" class="member-name-link">PushProjector</a><wbr>(@Nullable <a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a> origProj, |
| @Nullable <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> origFilter, |
| <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> childRel, |
| <a href="PushProjector.ExprCondition.html" title="interface in org.apache.calcite.rel.rules">PushProjector.ExprCondition</a> preserveExprCondition, |
| <a href="../../tools/RelBuilder.html" title="class in org.apache.calcite.tools">RelBuilder</a> relBuilder)</code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Creates a PushProjector object for pushing projects past a RelNode.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>@Nullable <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#convertProject(org.apache.calcite.rex.RexNode)" class="member-name-link">convertProject</a><wbr>(@Nullable <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> defaultExpr)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Decomposes a projection to the input references referenced by a |
| projection and a filter, either of which is optional.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#convertRefsAndExprs(org.apache.calcite.rex.RexNode,java.util.List,int%5B%5D)" class="member-name-link">convertRefsAndExprs</a><wbr>(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> rex, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="../type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>> destFields, |
| int[] adjustments)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Clones an expression tree and walks through it, adjusting each |
| RexInputRef index by some amount, and converting expressions that need to |
| be preserved to field references.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#createNewProject(org.apache.calcite.rel.RelNode,int%5B%5D)" class="member-name-link">createNewProject</a><wbr>(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> projChild, |
| int[] adjustments)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Creates a new projection based on the original projection, adjusting all |
| input refs using an adjustment array passed in.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#createProjectRefsAndExprs(org.apache.calcite.rel.RelNode,boolean,boolean)" class="member-name-link">createProjectRefsAndExprs</a><wbr>(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> projChild, |
| boolean adjust, |
| boolean rightSide)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Creates a projection based on the inputs specified in a bitmap and the |
| expressions that need to be preserved.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int[]</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getAdjustments()" class="member-name-link">getAdjustments</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Determines how much each input reference needs to be adjusted as a result |
| of projection.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#locateAllRefs()" class="member-name-link">locateAllRefs</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Locates all references found in either the projection expressions a |
| filter, as well as references to expressions that should be preserved.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>(org.apache.calcite.rel.core.Project,org.apache.calcite.rex.RexNode,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.rules.PushProjector.ExprCondition,org.apache.calcite.tools.RelBuilder)"> |
| <h3>PushProjector</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name">PushProjector</span><wbr><span class="parameters">(@Nullable <a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a> origProj, |
| @Nullable <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> origFilter, |
| <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> childRel, |
| <a href="PushProjector.ExprCondition.html" title="interface in org.apache.calcite.rel.rules">PushProjector.ExprCondition</a> preserveExprCondition, |
| <a href="../../tools/RelBuilder.html" title="class in org.apache.calcite.tools">RelBuilder</a> relBuilder)</span></div> |
| <div class="block">Creates a PushProjector object for pushing projects past a RelNode.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>origProj</code> - the original projection that is being pushed; |
| may be null if the projection is implied as a |
| result of a projection having been trivially |
| removed</dd> |
| <dd><code>origFilter</code> - the filter that the projection must also be |
| pushed past, if applicable</dd> |
| <dd><code>childRel</code> - the RelNode that the projection is being |
| pushed past</dd> |
| <dd><code>preserveExprCondition</code> - condition for whether an expression should |
| be preserved in the projection</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="convertProject(org.apache.calcite.rex.RexNode)"> |
| <h3>convertProject</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">@Nullable <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></span> <span class="element-name">convertProject</span><wbr><span class="parameters">(@Nullable <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> defaultExpr)</span></div> |
| <div class="block">Decomposes a projection to the input references referenced by a |
| projection and a filter, either of which is optional. If both are |
| provided, the filter is underneath the project. |
| |
| <p>Creates a projection containing all input references as well as |
| preserving any special expressions. Converts the original projection |
| and/or filter to reference the new projection. Then, finally puts on top, |
| a final projection corresponding to the original projection.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>defaultExpr</code> - expression to be used in the projection if no fields |
| or special columns are selected</dd> |
| <dt>Returns:</dt> |
| <dd>the converted projection if it makes sense to push elements of |
| the projection; otherwise returns null</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="locateAllRefs()"> |
| <h3>locateAllRefs</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">boolean</span> <span class="element-name">locateAllRefs</span>()</div> |
| <div class="block">Locates all references found in either the projection expressions a |
| filter, as well as references to expressions that should be preserved. |
| Based on that, determines whether pushing the projection makes sense.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>true if all inputs from the child that the projection is being |
| pushed past are referenced in the projection/filter and no special |
| preserve expressions are referenced; in that case, it does not make sense |
| to push the projection</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="createProjectRefsAndExprs(org.apache.calcite.rel.RelNode,boolean,boolean)"> |
| <h3>createProjectRefsAndExprs</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../core/Project.html" title="class in org.apache.calcite.rel.core">Project</a></span> <span class="element-name">createProjectRefsAndExprs</span><wbr><span class="parameters">(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> projChild, |
| boolean adjust, |
| boolean rightSide)</span></div> |
| <div class="block">Creates a projection based on the inputs specified in a bitmap and the |
| expressions that need to be preserved. The expressions are appended after |
| the input references.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>projChild</code> - child that the projection will be created on top of</dd> |
| <dd><code>adjust</code> - if true, need to create new projection expressions; |
| otherwise, the existing ones are reused</dd> |
| <dd><code>rightSide</code> - if true, creating a projection for the right hand side |
| of a join</dd> |
| <dt>Returns:</dt> |
| <dd>created projection</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getAdjustments()"> |
| <h3>getAdjustments</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">int[]</span> <span class="element-name">getAdjustments</span>()</div> |
| <div class="block">Determines how much each input reference needs to be adjusted as a result |
| of projection.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>array indicating how much each input needs to be adjusted by</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="convertRefsAndExprs(org.apache.calcite.rex.RexNode,java.util.List,int[])"> |
| <h3>convertRefsAndExprs</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></span> <span class="element-name">convertRefsAndExprs</span><wbr><span class="parameters">(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> rex, |
| <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><<a href="../type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>> destFields, |
| int[] adjustments)</span></div> |
| <div class="block">Clones an expression tree and walks through it, adjusting each |
| RexInputRef index by some amount, and converting expressions that need to |
| be preserved to field references.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>rex</code> - the expression</dd> |
| <dd><code>destFields</code> - fields that the new expressions will be referencing</dd> |
| <dd><code>adjustments</code> - the amount each input reference index needs to be |
| adjusted by</dd> |
| <dt>Returns:</dt> |
| <dd>modified expression tree</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="createNewProject(org.apache.calcite.rel.RelNode,int[])"> |
| <h3>createNewProject</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></span> <span class="element-name">createNewProject</span><wbr><span class="parameters">(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> projChild, |
| int[] adjustments)</span></div> |
| <div class="block">Creates a new projection based on the original projection, adjusting all |
| input refs using an adjustment array passed in. If there was no original |
| projection, create a new one that selects every field from the underlying |
| rel. |
| |
| <p>If the resulting projection would be trivial, return the child.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>projChild</code> - child of the new project</dd> |
| <dd><code>adjustments</code> - array indicating how much each input reference should |
| be adjusted by</dd> |
| <dt>Returns:</dt> |
| <dd>the created projection</dd> |
| </dl> |
| </section> |
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