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 <h1 title="Package org.apache.calcite.rex" class="title">Package org.apache.calcite.rex</h1>
 </div>
 <hr>
 <div class="package-signature"><span class="annotations">@DefaultQualifier(value=org.checkerframework.checker.nullness.qual.NonNull.class,locations=FIELD) @DefaultQualifier(value=org.checkerframework.checker.nullness.qual.NonNull.class,locations=PARAMETER) @DefaultQualifier(value=org.checkerframework.checker.nullness.qual.NonNull.class,locations=RETURN)
 </span>package <span class="element-name">org.apache.calcite.rex</span></div>
 <section class="package-description" id="package-description">
 <div class="block">Provides a language for representing row-expressions.

  <h2>Life-cycle</h2>

  <p>A <a href="../sql2rel/SqlToRelConverter.html" title="class in org.apache.calcite.sql2rel"><code>SqlToRelConverter</code></a> converts a SQL
  parse tree consisting of <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a> objects into
  a relational expression (<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>). Several
  kinds of nodes in this tree have row expressions
  (<a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a>).</p>

  <p>After the relational expression has been optimized, a
  <a href="../adapter/enumerable/JavaRelImplementor.html" title="class in org.apache.calcite.adapter.enumerable"><code>JavaRelImplementor</code></a> converts it
  into to a plan. If the plan is a Java parse tree, row-expressions are
  translated into equivalent Java expressions.</p>

  <h2>Expressions</h2>


  <p>Every row-expression has a type. (Compare with
  <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a>, which is created before validation,
  and therefore types may not be available.)</p>

  <p>Every node in the parse tree is a <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a>.
      Sub-types are:</p>
  <ul>
      <li><a href="RexLiteral.html" title="class in org.apache.calcite.rex"><code>RexLiteral</code></a> represents a boolean,
          numeric, string, or date constant, or the value <code>NULL</code>.
      </li>
      <li><a href="RexVariable.html" title="class in org.apache.calcite.rex"><code>RexVariable</code></a> represents a leaf of the
          tree. It has sub-types:
          <ul>
              <li><a href="RexCorrelVariable.html" title="class in org.apache.calcite.rex"><code>RexCorrelVariable</code></a> is a
                  correlating variable for nested-loop joins
              </li>
              <li><a href="RexInputRef.html" title="class in org.apache.calcite.rex"><code>RexInputRef</code></a> refers to a field
                  of an input relational expression
              </li>
              <li><a href="RexCall.html" title="class in org.apache.calcite.rex"><code>RexCall</code></a> is a call to an
                  operator or function.  By means of special operators, we can
                  use this construct to represent virtually every non-leaf node
                  in the tree.
              </li>
              <li><a href="RexRangeRef.html" title="class in org.apache.calcite.rex"><code>RexRangeRef</code></a> refers to a
                  collection of contiguous fields from an input relational
                  expression. It usually exists only during translation.
              </li>
          </ul>
      </li>
  </ul>

  <p>Expressions are generally
      created using a <a href="RexBuilder.html" title="class in org.apache.calcite.rex"><code>RexBuilder</code></a> factory.</p>

  <h2>Related packages</h2>
  <ul>
      <li><a href="../sql/package-summary.html"><code>org.apache.calcite.sql</code></a> SQL object model</li>

      <li><a href="../plan/package-summary.html"><code>org.apache.calcite.plan</code></a> Core classes, including
  <a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type"><code>RelDataType</code></a> and
  <a href="../rel/type/RelDataTypeFactory.html" title="interface in org.apache.calcite.rel.type"><code>RelDataTypeFactory</code></a>.</li>

  </ul></div>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <li>
 <div id="related-package-summary">
 <div class="caption"><span>Related Packages</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Package</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color"><a href="../package-summary.html">org.apache.calcite</a></div>
 <div class="col-last even-row-color">
 <div class="block">Main package for Calcite, the dynamic data management platform.</div>
 </div>
 </div>
 </div>
 </li>
 <li>
 <div id="class-summary">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="class-summary-tab0" role="tab" aria-selected="true" aria-controls="class-summary.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('class-summary', 'class-summary', 2)" class="active-table-tab">All Classes and Interfaces</button><button id="class-summary-tab1" role="tab" aria-selected="false" aria-controls="class-summary.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('class-summary', 'class-summary-tab1', 2)" class="table-tab">Interfaces</button><button id="class-summary-tab2" role="tab" aria-selected="false" aria-controls="class-summary.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('class-summary', 'class-summary-tab2', 2)" class="table-tab">Classes</button><button id="class-summary-tab3" role="tab" aria-selected="false" aria-controls="class-summary.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('class-summary', 'class-summary-tab3', 2)" class="table-tab">Enums</button></div>
 <div id="class-summary.tabpanel" role="tabpanel">
 <div class="summary-table two-column-summary" aria-labelledby="class-summary-tab0">
 <div class="table-header col-first">Class</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="LogicVisitor.html" title="class in org.apache.calcite.rex">LogicVisitor</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Visitor pattern for traversing a tree of <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> objects.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="RexAction.html" title="interface in org.apache.calcite.rex">RexAction</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab1">Deprecated.</div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexAnalyzer.html" title="class in org.apache.calcite.rex">RexAnalyzer</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Analyzes an expression, figures out what are the unbound variables,
  assigns a variety of values to each unbound variable, and evaluates
  the expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="RexBiVisitor.html" title="interface in org.apache.calcite.rex">RexBiVisitor</a>&lt;R,<wbr>P&gt;</div>
 <div class="col-last odd-row-color class-summary class-summary-tab1">
 <div class="block">Visitor pattern for traversing a tree of <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> objects
  and passing a payload to each.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexBiVisitorImpl.html" title="class in org.apache.calcite.rex">RexBiVisitorImpl</a>&lt;R,<wbr>P&gt;</div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Default implementation of <a href="RexBiVisitor.html" title="interface in org.apache.calcite.rex"><code>RexBiVisitor</code></a>, which visits each node but
  does nothing while it's there.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Factory for row expressions.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexCall.html" title="class in org.apache.calcite.rex">RexCall</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">An expression formed by a call to an operator with zero or more expressions
  as operands.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexCallBinding.html" title="class in org.apache.calcite.rex">RexCallBinding</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block"><code>RexCallBinding</code> implements <a href="../sql/SqlOperatorBinding.html" title="class in org.apache.calcite.sql"><code>SqlOperatorBinding</code></a> by
  referring to an underlying collection of <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> operands.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexChecker.html" title="class in org.apache.calcite.rex">RexChecker</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Visitor which checks the validity of a <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexCorrelVariable.html" title="class in org.apache.calcite.rex">RexCorrelVariable</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Reference to the current row of a correlating relational expression.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab3"><a href="RexDigestIncludeType.html" title="enum in org.apache.calcite.rex">RexDigestIncludeType</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab3">
 <div class="block">Defines if type information should be printed for <a href="RexLiteral.html" title="class in org.apache.calcite.rex"><code>RexLiteral</code></a>.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexDynamicParam.html" title="class in org.apache.calcite.rex">RexDynamicParam</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Dynamic parameter reference in a row-expression.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexExecutable.html" title="class in org.apache.calcite.rex">RexExecutable</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Result of compiling code generated from a <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="RexExecutor.html" title="interface in org.apache.calcite.rex">RexExecutor</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab1">
 <div class="block">Can reduce expressions, writing a literal for each into a list.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexExecutorImpl.html" title="class in org.apache.calcite.rex">RexExecutorImpl</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Evaluates a <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexFieldAccess.html" title="class in org.apache.calcite.rex">RexFieldAccess</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Access to a field of a row-expression.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexFieldCollation.html" title="class in org.apache.calcite.rex">RexFieldCollation</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Expression combined with sort flags (DESCENDING, NULLS LAST).</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexInputRef.html" title="class in org.apache.calcite.rex">RexInputRef</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Variable which references a field of an input relational expression.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexInterpreter.html" title="class in org.apache.calcite.rex">RexInterpreter</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Evaluates <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> expressions.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexLiteral.html" title="class in org.apache.calcite.rex">RexLiteral</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Constant value in a row-expression.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexLocalRef.html" title="class in org.apache.calcite.rex">RexLocalRef</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Local variable.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexMultisetUtil.html" title="class in org.apache.calcite.rex">RexMultisetUtil</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Utility class for various methods related to multisets.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Row expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexNormalize.html" title="class in org.apache.calcite.rex">RexNormalize</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Context required to normalize a row-expression.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexOver.html" title="class in org.apache.calcite.rex">RexOver</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Call to an aggregate function over a window.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="RexPattern.html" title="interface in org.apache.calcite.rex">RexPattern</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab1">Deprecated.</div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexPatternFieldRef.html" title="class in org.apache.calcite.rex">RexPatternFieldRef</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Variable that references a field of an input relational expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexPermutationShuttle.html" title="class in org.apache.calcite.rex">RexPermutationShuttle</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Visitor which replaces <a href="RexLocalRef.html" title="class in org.apache.calcite.rex"><code>RexLocalRef</code></a> objects after the expressions in a
  <a href="RexProgram.html" title="class in org.apache.calcite.rex"><code>RexProgram</code></a> have been reordered.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexPermuteInputsShuttle.html" title="class in org.apache.calcite.rex">RexPermuteInputsShuttle</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Shuttle which applies a permutation to its input fields.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexProgram.html" title="class in org.apache.calcite.rex">RexProgram</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">A collection of expressions which read inputs, compute output expressions,
  and optionally use a condition to filter rows.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexProgramBuilder.html" title="class in org.apache.calcite.rex">RexProgramBuilder</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Workspace for constructing a <a href="RexProgram.html" title="class in org.apache.calcite.rex"><code>RexProgram</code></a>.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexRangeRef.html" title="class in org.apache.calcite.rex">RexRangeRef</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Reference to a range of columns.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexShuttle.html" title="class in org.apache.calcite.rex">RexShuttle</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Passes over a row-expression, calling a handler method for each node,
  appropriate to the type of the node.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexSimplify.html" title="class in org.apache.calcite.rex">RexSimplify</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Context required to simplify a row-expression.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexSlot.html" title="class in org.apache.calcite.rex">RexSlot</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Abstract base class for <a href="RexInputRef.html" title="class in org.apache.calcite.rex"><code>RexInputRef</code></a> and <a href="RexLocalRef.html" title="class in org.apache.calcite.rex"><code>RexLocalRef</code></a>.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexSlot.SelfPopulatingList.html" title="class in org.apache.calcite.rex">RexSlot.SelfPopulatingList</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Thread-safe list that populates itself if you make a reference beyond
  the end of the list.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab1"><a href="RexSqlConvertlet.html" title="interface in org.apache.calcite.rex">RexSqlConvertlet</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab1">
 <div class="block">Converts a <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> expression into a <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a> expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="RexSqlConvertletTable.html" title="interface in org.apache.calcite.rex">RexSqlConvertletTable</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab1">
 <div class="block">Collection of <a href="RexSqlConvertlet.html" title="interface in org.apache.calcite.rex"><code>RexSqlConvertlet</code></a>s.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexSqlReflectiveConvertletTable.html" title="class in org.apache.calcite.rex">RexSqlReflectiveConvertletTable</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Implementation of <a href="RexSqlConvertletTable.html" title="interface in org.apache.calcite.rex"><code>RexSqlConvertletTable</code></a>.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexSqlStandardConvertletTable.html" title="class in org.apache.calcite.rex">RexSqlStandardConvertletTable</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Standard implementation of <a href="RexSqlConvertletTable.html" title="interface in org.apache.calcite.rex"><code>RexSqlConvertletTable</code></a>.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexSubQuery.html" title="class in org.apache.calcite.rex">RexSubQuery</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Scalar expression that represents an IN, EXISTS or scalar sub-query.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexTableInputRef.html" title="class in org.apache.calcite.rex">RexTableInputRef</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Variable which references a column of a table occurrence in a relational plan.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexTableInputRef.RelTableRef.html" title="class in org.apache.calcite.rex">RexTableInputRef.RelTableRef</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Identifies uniquely a table by its qualified name and its entity number
  (occurrence).</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="RexToSqlNodeConverter.html" title="interface in org.apache.calcite.rex">RexToSqlNodeConverter</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab1">
 <div class="block">Converts expressions from <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> to <a href="../sql/SqlNode.html" title="class in org.apache.calcite.sql"><code>SqlNode</code></a>.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexToSqlNodeConverterImpl.html" title="class in org.apache.calcite.rex">RexToSqlNodeConverterImpl</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Standard implementation of <a href="RexToSqlNodeConverter.html" title="interface in org.apache.calcite.rex"><code>RexToSqlNodeConverter</code></a>.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexTransformer.html" title="class in org.apache.calcite.rex">RexTransformer</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Takes a tree of <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> objects and transforms it into another in one
  sense equivalent tree.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexUnaryBiVisitor.html" title="class in org.apache.calcite.rex">RexUnaryBiVisitor</a>&lt;R&gt;</div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Default implementation of a <a href="RexBiVisitor.html" title="interface in org.apache.calcite.rex"><code>RexBiVisitor</code></a> whose payload and return
  type are the same.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab3"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab3">
 <div class="block">Policy for whether a simplified expression may instead return another
  value.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexUtil.html" title="class in org.apache.calcite.rex">RexUtil</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Utility methods concerning row-expressions.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexUtil.ExprSimplifier.html" title="class in org.apache.calcite.rex">RexUtil.ExprSimplifier</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">Deprecated.</div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexUtil.FieldAccessFinder.html" title="class in org.apache.calcite.rex">RexUtil.FieldAccessFinder</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Visitor which builds a bitmap of the inputs used by an expression.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexUtil.FixNullabilityShuttle.html" title="class in org.apache.calcite.rex">RexUtil.FixNullabilityShuttle</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Shuttle that fixes up an expression to match changes in nullability of
  input fields.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexUtil.RexFinder.html" title="class in org.apache.calcite.rex">RexUtil.RexFinder</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Visitor that tells whether a node matching a particular description exists
  in a tree.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexUtil.SubQueryFinder.html" title="class in org.apache.calcite.rex">RexUtil.SubQueryFinder</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Visitor that throws <a href="../util/Util.FoundOne.html" title="class in org.apache.calcite.util"><code>Util.FoundOne</code></a> if
  applied to an expression that contains a <a href="RexSubQuery.html" title="class in org.apache.calcite.rex"><code>RexSubQuery</code></a>.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexVariable.html" title="class in org.apache.calcite.rex">RexVariable</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">A row-expression which references a field.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a>&lt;R&gt;</div>
 <div class="col-last odd-row-color class-summary class-summary-tab1">
 <div class="block">Visitor pattern for traversing a tree of <a href="RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> objects.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexVisitorImpl.html" title="class in org.apache.calcite.rex">RexVisitorImpl</a>&lt;R&gt;</div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Default implementation of <a href="RexVisitor.html" title="interface in org.apache.calcite.rex"><code>RexVisitor</code></a>, which visits each node but does
  nothing while it's there.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexWindow.html" title="class in org.apache.calcite.rex">RexWindow</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Specification of the window of rows over which a <a href="RexOver.html" title="class in org.apache.calcite.rex"><code>RexOver</code></a> windowed
  aggregate is evaluated.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Abstracts "XX PRECEDING/FOLLOWING" and "CURRENT ROW" bounds for windowed
  aggregates.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="RexWindowBounds.html" title="class in org.apache.calcite.rex">RexWindowBounds</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">Helpers for <a href="RexWindowBound.html" title="class in org.apache.calcite.rex"><code>RexWindowBound</code></a>.</div>
 </div>
 </div>
 </div>
 </div>
 </li>
 </ul>
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