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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.rules</a></div> |
| <h2 title="Class ReduceDecimalsRule" class="title">Class ReduceDecimalsRule</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">org.apache.calcite.plan.RelOptRule</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.rel.rules.ReduceDecimalsRule</li> |
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| <pre>public class <span class="typeNameLabel">ReduceDecimalsRule</span> |
| extends <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></pre> |
| <div class="block">ReduceDecimalsRule is a rule which reduces decimal operations (such as casts |
| or arithmetic) into operations involving more primitive types (such as longs |
| and doubles). The rule allows Calcite implementations to deal with decimals |
| in a consistent manner, while saving the effort of implementing them. |
| |
| <p>The rule can be applied to a |
| <a href="../logical/LogicalCalc.html" title="class in org.apache.calcite.rel.logical"><code>LogicalCalc</code></a> with a program for which |
| <a href="../../rex/RexUtil.html#requiresDecimalExpansion(org.apache.calcite.rex.RexNode,boolean)"><code>RexUtil.requiresDecimalExpansion(org.apache.calcite.rex.RexNode, boolean)</code></a> returns true. The rule relies on a |
| <a href="../../rex/RexShuttle.html" title="class in org.apache.calcite.rex"><code>RexShuttle</code></a> to walk over relational expressions and replace them. |
| |
| <p>While decimals are generally not implemented by the Calcite runtime, the |
| rule is optionally applied, in order to support the situation in which we |
| would like to push down decimal operations to an external database.</div> |
| </li> |
| </ul> |
| </div> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.BinaryArithmeticExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.BinaryArithmeticExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Expands a decimal arithmetic expression</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.CaseExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CaseExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Expander that rewrites case expressions, in place.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.CastArgAsDoubleExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CastArgAsDoubleExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">An expander which casts decimal arguments as doubles</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.CastArgAsTypeExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CastArgAsTypeExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">An expander which casts decimal arguments as another type</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.CastExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CastExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Expands a decimal cast expression</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.CeilExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CeilExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Expander that rewrites ceiling(decimal) expressions: |
| |
| </div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.DecimalShuttle.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.DecimalShuttle</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">A shuttle which converts decimal expressions to expressions based on |
| longs.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.ExpanderMap.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.ExpanderMap</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Maps a RexCall to a RexExpander</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.FloorExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.FloorExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Expander that rewrites floor(decimal) expressions: |
| |
| </div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.PassThroughExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.PassThroughExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">An expander that substitutes decimals with their integer representations.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.ReinterpretExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.ReinterpretExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">This expander simplifies reinterpret calls.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReduceDecimalsRule.RexExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.RexExpander</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Rewrites a decimal expression for a specific set of SqlOperator's.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
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| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="ReduceDecimalsRule.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#INSTANCE">INSTANCE</a></span></code></th> |
| <td class="colLast"> </td> |
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| </a> |
| <h3>Fields inherited from class org.apache.calcite.plan.<a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></h3> |
| <code><a href="../../plan/RelOptRule.html#description">description</a>, <a href="../../plan/RelOptRule.html#operands">operands</a>, <a href="../../plan/RelOptRule.html#relBuilderFactory">relBuilderFactory</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <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.tools.RelBuilderFactory)">ReduceDecimalsRule</a></span>​(<a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a ReduceDecimalsRule.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../plan/Convention.html" title="interface in org.apache.calcite.plan">Convention</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getOutConvention()">getOutConvention</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the convention of the result of firing this rule, null if |
| not known.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onMatch(org.apache.calcite.plan.RelOptRuleCall)">onMatch</a></span>​(<a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call)</code></th> |
| <td class="colLast"> |
| <div class="block">Receives notification about a rule match.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| </a> |
| <h3>Methods inherited from class org.apache.calcite.plan.<a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></h3> |
| <code><a href="../../plan/RelOptRule.html#any()">any</a>, <a href="../../plan/RelOptRule.html#convert(org.apache.calcite.rel.RelNode,org.apache.calcite.plan.RelTrait)">convert</a>, <a href="../../plan/RelOptRule.html#convert(org.apache.calcite.rel.RelNode,org.apache.calcite.plan.RelTraitSet)">convert</a>, <a href="../../plan/RelOptRule.html#convertList(java.util.List,org.apache.calcite.plan.RelTrait)">convertList</a>, <a href="../../plan/RelOptRule.html#convertOperand(java.lang.Class,com.google.common.base.Predicate,org.apache.calcite.plan.RelTrait)">convertOperand</a>, <a href="../../plan/RelOptRule.html#convertOperand(java.lang.Class,java.util.function.Predicate,org.apache.calcite.plan.RelTrait)">convertOperand</a>, <a href="../../plan/RelOptRule.html#equals(java.lang.Object)">equals</a>, <a href="../../plan/RelOptRule.html#equals(org.apache.calcite.plan.RelOptRule)">equals</a>, <a href="../../plan/RelOptRule.html#getOperand()">getOperand</a>, <a href="../../plan/RelOptRule.html#getOperands()">getOperands</a>, <a href="../../plan/RelOptRule.html#getOutTrait()">getOutTrait</a>, <a href="../../plan/RelOptRule.html#hashCode()">hashCode</a>, <a href="../../plan/RelOptRule.html#matches(org.apache.calcite.plan.RelOptRuleCall)">matches</a>, <a href="../../plan/RelOptRule.html#none()">none</a>, <a href="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelOptRuleOperandChildren)">operand</a>, <a href="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">operand</a>, <a href="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelTrait,com.google.common.base.Predicate,org.apache.calcite.plan.RelOptRuleOperandChildren)">operand</a>, <a href="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelTrait,com.google.common.base.Predicate,org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">operand</a>, <a href="../../plan/RelOptRule.html#operand(java.lang.Class,org.apache.calcite.plan.RelTrait,org.apache.calcite.plan.RelOptRuleOperandChildren)">operand</a>, <a href="../../plan/RelOptRule.html#operandJ(java.lang.Class,org.apache.calcite.plan.RelTrait,java.util.function.Predicate,org.apache.calcite.plan.RelOptRuleOperandChildren)">operandJ</a>, <a href="../../plan/RelOptRule.html#operandJ(java.lang.Class,org.apache.calcite.plan.RelTrait,java.util.function.Predicate,org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">operandJ</a>, <a href="../../plan/RelOptRule.html#some(org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">some</a>, <a href="../../plan/RelOptRule.html#toString()">toString</a>, <a href="../../plan/RelOptRule.html#unordered(org.apache.calcite.plan.RelOptRuleOperand,org.apache.calcite.plan.RelOptRuleOperand...)">unordered</a></code></li> |
| </ul> |
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| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
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| <a id="INSTANCE"> |
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| <h4>INSTANCE</h4> |
| <pre>public static final <a href="ReduceDecimalsRule.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule</a> INSTANCE</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <section role="region"> |
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| <h4>ReduceDecimalsRule</h4> |
| <pre>public ReduceDecimalsRule​(<a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a> relBuilderFactory)</pre> |
| <div class="block">Creates a ReduceDecimalsRule.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
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| <a id="getOutConvention()"> |
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| <h4>getOutConvention</h4> |
| <pre class="methodSignature">public <a href="../../plan/Convention.html" title="interface in org.apache.calcite.plan">Convention</a> getOutConvention()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../plan/RelOptRule.html#getOutConvention()">RelOptRule</a></code></span></div> |
| <div class="block">Returns the convention of the result of firing this rule, null if |
| not known.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../plan/RelOptRule.html#getOutConvention()">getOutConvention</a></code> in class <code><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Convention of the result of firing this rule, null if |
| not known</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="onMatch(org.apache.calcite.plan.RelOptRuleCall)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>onMatch</h4> |
| <pre class="methodSignature">public void onMatch​(<a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a> call)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../plan/RelOptRule.html#onMatch(org.apache.calcite.plan.RelOptRuleCall)">RelOptRule</a></code></span></div> |
| <div class="block">Receives notification about a rule match. At the time that this method is |
| called, <a href="../../plan/RelOptRuleCall.html#rels"><code>call.rels</code></a> holds the set of relational |
| expressions which match the operands to the rule; <code> |
| call.rels[0]</code> is the root expression. |
| |
| <p>Typically a rule would check that the nodes are valid matches, creates |
| a new expression, then calls back <a href="../../plan/RelOptRuleCall.html#transformTo(org.apache.calcite.rel.RelNode,java.util.Map)"><code>RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>)</code></a> to |
| register the expression.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../plan/RelOptRule.html#onMatch(org.apache.calcite.plan.RelOptRuleCall)">onMatch</a></code> in class <code><a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>call</code> - Rule call</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../plan/RelOptRule.html#matches(org.apache.calcite.plan.RelOptRuleCall)"><code>RelOptRule.matches(RelOptRuleCall)</code></a></dd> |
| </dl> |
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