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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rel.rules</a></div>
<h2 title="Class JoinToMultiJoinRule" class="title">Class JoinToMultiJoinRule</h2>
</div>
<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>
<li>
<ul class="inheritance">
<li>org.apache.calcite.rel.rules.JoinToMultiJoinRule</li>
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<pre>public class <span class="typeNameLabel">JoinToMultiJoinRule</span>
extends <a href="../../plan/RelOptRule.html" title="class in org.apache.calcite.plan">RelOptRule</a></pre>
<div class="block">Planner rule to flatten a tree of
<a href="../logical/LogicalJoin.html" title="class in org.apache.calcite.rel.logical"><code>LogicalJoin</code></a>s
into a single <a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules"><code>MultiJoin</code></a> with N inputs.
<p>An input is not flattened if
the input is a null generating input in an outer join, i.e., either input in
a full outer join, the right hand side of a left outer join, or the left hand
side of a right outer join.
<p>Join conditions are also pulled up from the inputs into the topmost
<a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules"><code>MultiJoin</code></a>,
unless the input corresponds to a null generating input in an outer join,
<p>Outer join information is also stored in the <a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules"><code>MultiJoin</code></a>. A
boolean flag indicates if the join is a full outer join, and in the case of
left and right outer joins, the join type and outer join conditions are
stored in arrays in the <a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules"><code>MultiJoin</code></a>. This outer join information is
associated with the null generating input in the outer join. So, in the case
of a a left outer join between A and B, the information is associated with B,
not A.
<p>Here are examples of the <a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules"><code>MultiJoin</code></a>s constructed after this rule
has been applied on following join trees.
<ul>
<li>A JOIN B &rarr; MJ(A, B)
<li>A JOIN B JOIN C &rarr; MJ(A, B, C)
<li>A LEFT JOIN B &rarr; MJ(A, B), left outer join on input#1
<li>A RIGHT JOIN B &rarr; MJ(A, B), right outer join on input#0
<li>A FULL JOIN B &rarr; MJ[full](A, B)
<li>A LEFT JOIN (B JOIN C) &rarr; MJ(A, MJ(B, C))), left outer join on
input#1 in the outermost MultiJoin
<li>(A JOIN B) LEFT JOIN C &rarr; MJ(A, B, C), left outer join on input#2
<li>(A LEFT JOIN B) JOIN C &rarr; MJ(MJ(A, B), C), left outer join on input#1
of the inner MultiJoin TODO
<li>A LEFT JOIN (B FULL JOIN C) &rarr; MJ(A, MJ[full](B, C)), left outer join
on input#1 in the outermost MultiJoin
<li>(A LEFT JOIN B) FULL JOIN (C RIGHT JOIN D) &rarr;
MJ[full](MJ(A, B), MJ(C, D)), left outer join on input #1 in the first
inner MultiJoin and right outer join on input#0 in the second inner
MultiJoin
</ul>
<p>The constructor is parameterized to allow any sub-class of
<a href="../core/Join.html" title="class in org.apache.calcite.rel.core"><code>Join</code></a>, not just
<a href="../logical/LogicalJoin.html" title="class in org.apache.calcite.rel.logical"><code>LogicalJoin</code></a>.</p></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="FilterMultiJoinMergeRule.html" title="class in org.apache.calcite.rel.rules"><code>FilterMultiJoinMergeRule</code></a>,
<a href="ProjectMultiJoinMergeRule.html" title="class in org.apache.calcite.rel.rules"><code>ProjectMultiJoinMergeRule</code></a></dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>private class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="JoinToMultiJoinRule.InputReferenceCounter.html" title="class in org.apache.calcite.rel.rules">JoinToMultiJoinRule.InputReferenceCounter</a></span></code></th>
<td class="colLast">
<div class="block">Visitor that keeps a reference count of the inputs used by an expression.</div>
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<th class="colSecond" scope="col">Field</th>
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<td class="colFirst"><code>static <a href="JoinToMultiJoinRule.html" title="class in org.apache.calcite.rel.rules">JoinToMultiJoinRule</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#INSTANCE">INSTANCE</a></span></code></th>
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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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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<tr class="altColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.Class)">JoinToMultiJoinRule</a></span>&#8203;(java.lang.Class&lt;? extends <a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&gt;&nbsp;clazz)</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated.</span></div>
</td>
</tr>
<tr class="rowColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.Class,org.apache.calcite.tools.RelBuilderFactory)">JoinToMultiJoinRule</a></span>&#8203;(java.lang.Class&lt;? extends <a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&gt;&nbsp;clazz,
<a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a>&nbsp;relBuilderFactory)</code></th>
<td class="colLast">
<div class="block">Creates a JoinToMultiJoinRule.</div>
</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</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>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>private com.google.common.collect.ImmutableMap&lt;java.lang.Integer,&#8203;<a href="../../util/ImmutableIntList.html" title="class in org.apache.calcite.util">ImmutableIntList</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addOnJoinFieldRefCounts(java.util.List,int,org.apache.calcite.rex.RexNode,java.util.List)">addOnJoinFieldRefCounts</a></span>&#8203;(java.util.List&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;multiJoinInputs,
int&nbsp;nTotalFields,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;joinCondition,
java.util.List&lt;int[]&gt;&nbsp;origJoinFieldRefCounts)</code></th>
<td class="colLast">
<div class="block">Adds on to the existing join condition reference counts the references
from the new join condition.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>private boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#canCombine(org.apache.calcite.rel.RelNode,boolean)">canCombine</a></span>&#8203;(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;input,
boolean&nbsp;nullGenerating)</code></th>
<td class="colLast">
<div class="block">Returns whether an input can be merged into a given relational expression
without changing semantics.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>private java.util.List&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#combineInputs(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode,java.util.List,java.util.List)">combineInputs</a></span>&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;join,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right,
java.util.List&lt;<a href="../../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a>&gt;&nbsp;projFieldsList,
java.util.List&lt;int[]&gt;&nbsp;joinFieldRefCountsList)</code></th>
<td class="colLast">
<div class="block">Combines the inputs into a LogicalJoin into an array of inputs.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>private java.util.List&lt;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#combineJoinFilters(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode)">combineJoinFilters</a></span>&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right)</code></th>
<td class="colLast">
<div class="block">Combines the join filters from the left and right inputs (if they are
MultiJoinRels) with the join filter in the joinrel into a single AND'd
join filter, unless the inputs correspond to null generating inputs in an
outer join</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>private void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#combineOuterJoins(org.apache.calcite.rel.core.Join,java.util.List,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode,java.util.List)">combineOuterJoins</a></span>&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
java.util.List&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;combinedInputs,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right,
java.util.List&lt;<a href="../../util/Pair.html" title="class in org.apache.calcite.util">Pair</a>&lt;<a href="../core/JoinRelType.html" title="enum in org.apache.calcite.rel.core">JoinRelType</a>,&#8203;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&gt;&nbsp;joinSpecs)</code></th>
<td class="colLast">
<div class="block">Combines the outer join conditions and join types from the left and right
join inputs.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>private java.util.List&lt;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#combinePostJoinFilters(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode)">combinePostJoinFilters</a></span>&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right)</code></th>
<td class="colLast">
<div class="block">Combines the post-join filters from the left and right inputs (if they
are MultiJoinRels) into a single AND'd filter.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>private void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#copyOuterJoinInfo(org.apache.calcite.rel.rules.MultiJoin,java.util.List,int,java.util.List,java.util.List)">copyOuterJoinInfo</a></span>&#8203;(<a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules">MultiJoin</a>&nbsp;multiJoin,
java.util.List&lt;<a href="../../util/Pair.html" title="class in org.apache.calcite.util">Pair</a>&lt;<a href="../core/JoinRelType.html" title="enum in org.apache.calcite.rel.core">JoinRelType</a>,&#8203;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&gt;&nbsp;destJoinSpecs,
int&nbsp;adjustmentAmount,
java.util.List&lt;<a href="../type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;srcFields,
java.util.List&lt;<a href="../type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;destFields)</code></th>
<td class="colLast">
<div class="block">Copies outer join data from a source MultiJoin to a new set of arrays.</div>
</td>
</tr>
<tr id="i7" 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="i8" 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>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>private <a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#shiftRightFilter(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.rules.MultiJoin,org.apache.calcite.rex.RexNode)">shiftRightFilter</a></span>&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules">MultiJoin</a>&nbsp;right,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;rightFilter)</code></th>
<td class="colLast">
<div class="block">Shifts a filter originating from the right child of the LogicalJoin to the
right, to reflect the filter now being applied on the resulting
MultiJoin.</div>
</td>
</tr>
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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>
</ul>
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</ul>
</section>
</li>
</ul>
</div>
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<h4>INSTANCE</h4>
<pre>public static final&nbsp;<a href="JoinToMultiJoinRule.html" title="class in org.apache.calcite.rel.rules">JoinToMultiJoinRule</a> INSTANCE</pre>
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<h4>JoinToMultiJoinRule</h4>
<pre>@Deprecated
public&nbsp;JoinToMultiJoinRule&#8203;(java.lang.Class&lt;? extends <a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&gt;&nbsp;clazz)</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span></div>
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<h4>JoinToMultiJoinRule</h4>
<pre>public&nbsp;JoinToMultiJoinRule&#8203;(java.lang.Class&lt;? extends <a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&gt;&nbsp;clazz,
<a href="../../tools/RelBuilderFactory.html" title="interface in org.apache.calcite.tools">RelBuilderFactory</a>&nbsp;relBuilderFactory)</pre>
<div class="block">Creates a JoinToMultiJoinRule.</div>
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<h3>Method Detail</h3>
<a id="matches(org.apache.calcite.plan.RelOptRuleCall)">
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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="onMatch(org.apache.calcite.plan.RelOptRuleCall)">
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<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="../../plan/RelOptRule.html#matches(org.apache.calcite.plan.RelOptRuleCall)"><code>RelOptRule.matches(RelOptRuleCall)</code></a></dd>
</dl>
</li>
</ul>
<a id="combineInputs(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode,java.util.List,java.util.List)">
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<h4>combineInputs</h4>
<pre class="methodSignature">private&nbsp;java.util.List&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;combineInputs&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;join,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right,
java.util.List&lt;<a href="../../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a>&gt;&nbsp;projFieldsList,
java.util.List&lt;int[]&gt;&nbsp;joinFieldRefCountsList)</pre>
<div class="block">Combines the inputs into a LogicalJoin into an array of inputs.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>join</code> - original join</dd>
<dd><code>left</code> - left input into join</dd>
<dd><code>right</code> - right input into join</dd>
<dd><code>projFieldsList</code> - returns a list of the new combined projection
fields</dd>
<dd><code>joinFieldRefCountsList</code> - returns a list of the new combined join
field reference counts</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>combined left and right inputs in an array</dd>
</dl>
</li>
</ul>
<a id="combineOuterJoins(org.apache.calcite.rel.core.Join,java.util.List,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode,java.util.List)">
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<h4>combineOuterJoins</h4>
<pre class="methodSignature">private&nbsp;void&nbsp;combineOuterJoins&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
java.util.List&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;combinedInputs,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right,
java.util.List&lt;<a href="../../util/Pair.html" title="class in org.apache.calcite.util">Pair</a>&lt;<a href="../core/JoinRelType.html" title="enum in org.apache.calcite.rel.core">JoinRelType</a>,&#8203;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&gt;&nbsp;joinSpecs)</pre>
<div class="block">Combines the outer join conditions and join types from the left and right
join inputs. If the join itself is either a left or right outer join,
then the join condition corresponding to the join is also set in the
position corresponding to the null-generating input into the join. The
join type is also set.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>joinRel</code> - join rel</dd>
<dd><code>combinedInputs</code> - the combined inputs to the join</dd>
<dd><code>left</code> - left child of the joinrel</dd>
<dd><code>right</code> - right child of the joinrel</dd>
<dd><code>joinSpecs</code> - the list where the join types and conditions will be
copied</dd>
</dl>
</li>
</ul>
<a id="copyOuterJoinInfo(org.apache.calcite.rel.rules.MultiJoin,java.util.List,int,java.util.List,java.util.List)">
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<h4>copyOuterJoinInfo</h4>
<pre class="methodSignature">private&nbsp;void&nbsp;copyOuterJoinInfo&#8203;(<a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules">MultiJoin</a>&nbsp;multiJoin,
java.util.List&lt;<a href="../../util/Pair.html" title="class in org.apache.calcite.util">Pair</a>&lt;<a href="../core/JoinRelType.html" title="enum in org.apache.calcite.rel.core">JoinRelType</a>,&#8203;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&gt;&nbsp;destJoinSpecs,
int&nbsp;adjustmentAmount,
java.util.List&lt;<a href="../type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;srcFields,
java.util.List&lt;<a href="../type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;destFields)</pre>
<div class="block">Copies outer join data from a source MultiJoin to a new set of arrays.
Also adjusts the conditions to reflect the new position of an input if
that input ends up being shifted to the right.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>multiJoin</code> - the source MultiJoin</dd>
<dd><code>destJoinSpecs</code> - the list where the join types and conditions will
be copied</dd>
<dd><code>adjustmentAmount</code> - if &gt; 0, the amount the RexInputRefs in the join
conditions need to be adjusted by</dd>
<dd><code>srcFields</code> - the source fields that the original join conditions
are referencing</dd>
<dd><code>destFields</code> - the destination fields that the new join conditions</dd>
</dl>
</li>
</ul>
<a id="combineJoinFilters(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode)">
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<h4>combineJoinFilters</h4>
<pre class="methodSignature">private&nbsp;java.util.List&lt;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;combineJoinFilters&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right)</pre>
<div class="block">Combines the join filters from the left and right inputs (if they are
MultiJoinRels) with the join filter in the joinrel into a single AND'd
join filter, unless the inputs correspond to null generating inputs in an
outer join</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>joinRel</code> - join rel</dd>
<dd><code>left</code> - left child of the join</dd>
<dd><code>right</code> - right child of the join</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>combined join filters AND-ed together</dd>
</dl>
</li>
</ul>
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<h4>canCombine</h4>
<pre class="methodSignature">private&nbsp;boolean&nbsp;canCombine&#8203;(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;input,
boolean&nbsp;nullGenerating)</pre>
<div class="block">Returns whether an input can be merged into a given relational expression
without changing semantics.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>input</code> - input into a join</dd>
<dd><code>nullGenerating</code> - true if the input is null generating</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the input can be combined into a parent MultiJoin</dd>
</dl>
</li>
</ul>
<a id="shiftRightFilter(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.rules.MultiJoin,org.apache.calcite.rex.RexNode)">
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<h4>shiftRightFilter</h4>
<pre class="methodSignature">private&nbsp;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;shiftRightFilter&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="MultiJoin.html" title="class in org.apache.calcite.rel.rules">MultiJoin</a>&nbsp;right,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;rightFilter)</pre>
<div class="block">Shifts a filter originating from the right child of the LogicalJoin to the
right, to reflect the filter now being applied on the resulting
MultiJoin.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>joinRel</code> - the original LogicalJoin</dd>
<dd><code>left</code> - the left child of the LogicalJoin</dd>
<dd><code>right</code> - the right child of the LogicalJoin</dd>
<dd><code>rightFilter</code> - the filter originating from the right child</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the adjusted right filter</dd>
</dl>
</li>
</ul>
<a id="addOnJoinFieldRefCounts(java.util.List,int,org.apache.calcite.rex.RexNode,java.util.List)">
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<h4>addOnJoinFieldRefCounts</h4>
<pre class="methodSignature">private&nbsp;com.google.common.collect.ImmutableMap&lt;java.lang.Integer,&#8203;<a href="../../util/ImmutableIntList.html" title="class in org.apache.calcite.util">ImmutableIntList</a>&gt;&nbsp;addOnJoinFieldRefCounts&#8203;(java.util.List&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;multiJoinInputs,
int&nbsp;nTotalFields,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;joinCondition,
java.util.List&lt;int[]&gt;&nbsp;origJoinFieldRefCounts)</pre>
<div class="block">Adds on to the existing join condition reference counts the references
from the new join condition.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>multiJoinInputs</code> - inputs into the new MultiJoin</dd>
<dd><code>nTotalFields</code> - total number of fields in the MultiJoin</dd>
<dd><code>joinCondition</code> - the new join condition</dd>
<dd><code>origJoinFieldRefCounts</code> - existing join condition reference counts</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Map containing the new join condition</dd>
</dl>
</li>
</ul>
<a id="combinePostJoinFilters(org.apache.calcite.rel.core.Join,org.apache.calcite.rel.RelNode,org.apache.calcite.rel.RelNode)">
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<h4>combinePostJoinFilters</h4>
<pre class="methodSignature">private&nbsp;java.util.List&lt;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;combinePostJoinFilters&#8203;(<a href="../core/Join.html" title="class in org.apache.calcite.rel.core">Join</a>&nbsp;joinRel,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;left,
<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;right)</pre>
<div class="block">Combines the post-join filters from the left and right inputs (if they
are MultiJoinRels) into a single AND'd filter.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>joinRel</code> - the original LogicalJoin</dd>
<dd><code>left</code> - left child of the LogicalJoin</dd>
<dd><code>right</code> - right child of the LogicalJoin</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>combined post-join filters AND'd together</dd>
</dl>
</li>
</ul>
</li>
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