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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.adapter.cassandra</a></div>
<h2 title="Class CassandraRules.CassandraFilterRule" class="title">Class CassandraRules.CassandraFilterRule</h2>
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<div class="contentContainer">
<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>
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<li>org.apache.calcite.adapter.cassandra.CassandraRules.CassandraFilterRule</li>
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<pre>private static class <span class="typeNameLabel">CassandraRules.CassandraFilterRule</span>
extends <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></pre>
<div class="block">Rule to convert a <a href="../../rel/logical/LogicalFilter.html" title="class in org.apache.calcite.rel.logical"><code>LogicalFilter</code></a> to a
<a href="CassandraFilter.html" title="class in org.apache.calcite.adapter.cassandra"><code>CassandraFilter</code></a>.</div>
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<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>private static <a href="CassandraRules.CassandraFilterRule.html" title="class in org.apache.calcite.adapter.cassandra">CassandraRules.CassandraFilterRule</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#INSTANCE">INSTANCE</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.util.function.Predicate&lt;<a href="../../rel/logical/LogicalFilter.html" title="class in org.apache.calcite.rel.logical">LogicalFilter</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#PREDICATE">PREDICATE</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<h3>Fields inherited from class&nbsp;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>
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<td class="colFirst"><code>private </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">CassandraFilterRule</a></span>()</code></th>
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<td class="colFirst"><code>private java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#compareFieldWithLiteral(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode,java.util.List)">compareFieldWithLiteral</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;left,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;right,
java.util.List&lt;java.lang.String&gt;&nbsp;fieldNames)</code></th>
<td class="colLast">
<div class="block">Check if an equality operation is comparing a primary key column with a literal.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#convert(org.apache.calcite.rel.logical.LogicalFilter,org.apache.calcite.adapter.cassandra.CassandraTableScan)">convert</a></span>&#8203;(<a href="../../rel/logical/LogicalFilter.html" title="class in org.apache.calcite.rel.logical">LogicalFilter</a>&nbsp;filter,
<a href="CassandraTableScan.html" title="class in org.apache.calcite.adapter.cassandra">CassandraTableScan</a>&nbsp;scan)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>private boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isEqualityOnKey(org.apache.calcite.rex.RexNode,java.util.List,java.util.Set,java.util.List)">isEqualityOnKey</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node,
java.util.List&lt;java.lang.String&gt;&nbsp;fieldNames,
java.util.Set&lt;java.lang.String&gt;&nbsp;partitionKeys,
java.util.List&lt;java.lang.String&gt;&nbsp;clusteringKeys)</code></th>
<td class="colLast">
<div class="block">Check if the node is a supported predicate (primary key equality).</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#matches(org.apache.calcite.plan.RelOptRuleCall)">matches</a></span>&#8203;(<a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</code></th>
<td class="colLast">
<div class="block">Returns whether this rule could possibly match the given operands.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<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>&#8203;(<a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</code></th>
<td class="colLast">
<div class="block">Receives notification about a rule match.</div>
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<h3>Methods inherited from class&nbsp;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#getOutConvention()">getOutConvention</a>, <a href="../../plan/RelOptRule.html#getOutTrait()">getOutTrait</a>, <a href="../../plan/RelOptRule.html#hashCode()">hashCode</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>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li>
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<h4>PREDICATE</h4>
<pre>private static final&nbsp;java.util.function.Predicate&lt;<a href="../../rel/logical/LogicalFilter.html" title="class in org.apache.calcite.rel.logical">LogicalFilter</a>&gt; PREDICATE</pre>
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<h4>INSTANCE</h4>
<pre>private static final&nbsp;<a href="CassandraRules.CassandraFilterRule.html" title="class in org.apache.calcite.adapter.cassandra">CassandraRules.CassandraFilterRule</a> INSTANCE</pre>
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<h4>CassandraFilterRule</h4>
<pre>private&nbsp;CassandraFilterRule()</pre>
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<h4>matches</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;matches&#8203;(<a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../plan/RelOptRule.html#matches(org.apache.calcite.plan.RelOptRuleCall)">RelOptRule</a></code></span></div>
<div class="block">Returns whether this rule could possibly match the given operands.
<p>This method is an opportunity to apply side-conditions to a rule. The
<a href="../../plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan"><code>RelOptPlanner</code></a> calls this method after matching all operands of
the rule, and before calling <a href="../../plan/RelOptRule.html#onMatch(org.apache.calcite.plan.RelOptRuleCall)"><code>RelOptRule.onMatch(RelOptRuleCall)</code></a>.
<p>In implementations of <a href="../../plan/RelOptPlanner.html" title="interface in org.apache.calcite.plan"><code>RelOptPlanner</code></a> which may queue up a
matched <a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan"><code>RelOptRuleCall</code></a> for a long time before calling
<a href="../../plan/RelOptRule.html#onMatch(org.apache.calcite.plan.RelOptRuleCall)"><code>RelOptRule.onMatch(RelOptRuleCall)</code></a>, this method is beneficial because it
allows the planner to discard rules earlier in the process.
<p>The default implementation of this method returns <code>true</code>.
It is acceptable for any implementation of this method to give a false
positives, that is, to say that the rule matches the operands but have
<a href="../../plan/RelOptRule.html#onMatch(org.apache.calcite.plan.RelOptRuleCall)"><code>RelOptRule.onMatch(RelOptRuleCall)</code></a> subsequently not generate any
successors.
<p>The following script is useful to identify rules which commonly
produce no successors. You should override this method for these rules:
<blockquote>
<pre><code>awk '
/Apply rule/ {rule=$4; ruleCount[rule]++;}
/generated 0 successors/ {ruleMiss[rule]++;}
END {
printf "%-30s %s %s\n", "Rule", "Fire", "Miss";
for (i in ruleCount) {
printf "%-30s %5d %5d\n", i, ruleCount[i], ruleMiss[i];
}
} ' FarragoTrace.log</code></pre>
</blockquote></div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../plan/RelOptRule.html#matches(org.apache.calcite.plan.RelOptRuleCall)">matches</a></code>&nbsp;in class&nbsp;<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 which has been determined to match all operands of
this rule</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether this RelOptRule matches a given RelOptRuleCall</dd>
</dl>
</li>
</ul>
<a id="isEqualityOnKey(org.apache.calcite.rex.RexNode,java.util.List,java.util.Set,java.util.List)">
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<h4>isEqualityOnKey</h4>
<pre class="methodSignature">private&nbsp;boolean&nbsp;isEqualityOnKey&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node,
java.util.List&lt;java.lang.String&gt;&nbsp;fieldNames,
java.util.Set&lt;java.lang.String&gt;&nbsp;partitionKeys,
java.util.List&lt;java.lang.String&gt;&nbsp;clusteringKeys)</pre>
<div class="block">Check if the node is a supported predicate (primary key equality).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>node</code> - Condition node to check</dd>
<dd><code>fieldNames</code> - Names of all columns in the table</dd>
<dd><code>partitionKeys</code> - Names of primary key columns</dd>
<dd><code>clusteringKeys</code> - Names of primary key columns</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>True if the node represents an equality predicate on a primary key</dd>
</dl>
</li>
</ul>
<a id="compareFieldWithLiteral(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode,java.util.List)">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>compareFieldWithLiteral</h4>
<pre class="methodSignature">private&nbsp;java.lang.String&nbsp;compareFieldWithLiteral&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;left,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;right,
java.util.List&lt;java.lang.String&gt;&nbsp;fieldNames)</pre>
<div class="block">Check if an equality operation is comparing a primary key column with a literal.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>left</code> - Left operand of the equality</dd>
<dd><code>right</code> - Right operand of the equality</dd>
<dd><code>fieldNames</code> - Names of all columns in the table</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The field being compared or null if there is no key equality</dd>
</dl>
</li>
</ul>
<a id="onMatch(org.apache.calcite.plan.RelOptRuleCall)">
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<li class="blockList">
<h4>onMatch</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;onMatch&#8203;(<a href="../../plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan">RelOptRuleCall</a>&nbsp;call)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<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&lt;org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode&gt;)</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>&nbsp;in class&nbsp;<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="../../rel/convert/ConverterRule.html" title="class in org.apache.calcite.rel.convert"><code>ConverterRule</code></a></dd>
</dl>
</li>
</ul>
<a id="convert(org.apache.calcite.rel.logical.LogicalFilter,org.apache.calcite.adapter.cassandra.CassandraTableScan)">
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<ul class="blockListLast">
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<h4>convert</h4>
<pre class="methodSignature">public&nbsp;<a href="../../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;convert&#8203;(<a href="../../rel/logical/LogicalFilter.html" title="class in org.apache.calcite.rel.logical">LogicalFilter</a>&nbsp;filter,
<a href="CassandraTableScan.html" title="class in org.apache.calcite.adapter.cassandra">CassandraTableScan</a>&nbsp;scan)</pre>
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