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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 ReduceDecimalsRule.RexExpander" class="title">Class ReduceDecimalsRule.RexExpander</h2>
</div>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>org.apache.calcite.rel.rules.ReduceDecimalsRule.RexExpander</li>
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<dt>Direct Known Subclasses:</dt>
<dd><code><a href="ReduceDecimalsRule.BinaryArithmeticExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.BinaryArithmeticExpander</a></code>, <code><a href="ReduceDecimalsRule.CaseExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CaseExpander</a></code>, <code><a href="ReduceDecimalsRule.CastArgAsTypeExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CastArgAsTypeExpander</a></code>, <code><a href="ReduceDecimalsRule.CastExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CastExpander</a></code>, <code><a href="ReduceDecimalsRule.CeilExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.CeilExpander</a></code>, <code><a href="ReduceDecimalsRule.FloorExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.FloorExpander</a></code>, <code><a href="ReduceDecimalsRule.PassThroughExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.PassThroughExpander</a></code>, <code><a href="ReduceDecimalsRule.ReinterpretExpander.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule.ReinterpretExpander</a></code></dd>
</dl>
<dl>
<dt>Enclosing class:</dt>
<dd><a href="ReduceDecimalsRule.html" title="class in org.apache.calcite.rel.rules">ReduceDecimalsRule</a></dd>
</dl>
<hr>
<pre>public abstract class <span class="typeNameLabel">ReduceDecimalsRule.RexExpander</span>
extends java.lang.Object</pre>
<div class="block">Rewrites a decimal expression for a specific set of SqlOperator's. In
general, most expressions are rewritten in such a way that SqlOperator's
do not have to deal with decimals. Decimals are represented by their
unscaled integer representations, similar to
<code>BigDecimal.unscaledValue()</code> (i.e. 10^scale). Once decimals are
decoded, SqlOperators can then operate on the integer representations. The
value can later be recoded as a decimal.
<p>For example, suppose one casts 2.0 as a decima(10,4). The value is
decoded (20), multiplied by a scale factor (1000), for a result of
(20000) which is encoded as a decimal(10,4), in this case 2.0000
<p>To avoid the lengthy coding of RexNode expressions, this base class
provides succinct methods for building expressions used in rewrites.</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>(package private) <a href="../../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#builder">builder</a></span></code></th>
<td class="colLast">
<div class="block">Factory for constructing new relational expressions</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) <a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#int8">int8</a></span></code></th>
<td class="colLast">
<div class="block">Type for the internal representation of decimals.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) <a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#real8">real8</a></span></code></th>
<td class="colLast">
<div class="block">Type for doubles.</div>
</td>
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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(org.apache.calcite.rex.RexBuilder)">RexExpander</a></span>&#8203;(<a href="../../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;builder)</code></th>
<td class="colLast">
<div class="block">Constructs a RexExpander</div>
</td>
</tr>
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<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>protected <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="#accessValue(org.apache.calcite.rex.RexNode)">accessValue</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node)</code></th>
<td class="colLast">
<div class="block">Retrieves the primitive value of a numeric node.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#canExpand(org.apache.calcite.rex.RexCall)">canExpand</a></span>&#8203;(<a href="../../rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a>&nbsp;call)</code></th>
<td class="colLast">
<div class="block">This defaults to the utility method,
<a href="../../rex/RexUtil.html#requiresDecimalExpansion(org.apache.calcite.rex.RexNode,boolean)"><code>RexUtil.requiresDecimalExpansion(RexNode, boolean)</code></a> which checks
general guidelines on whether a rewrite should be considered at all.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected <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="#decodeValue(org.apache.calcite.rex.RexNode)">decodeValue</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;decimalNode)</code></th>
<td class="colLast">
<div class="block">Retrieves a decimal node's integer representation</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected <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="#encodeValue(org.apache.calcite.rex.RexNode,org.apache.calcite.rel.type.RelDataType)">encodeValue</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
<a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;decimalType)</code></th>
<td class="colLast">
<div class="block">Casts a decimal's integer representation to a decimal node.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>protected <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="#encodeValue(org.apache.calcite.rex.RexNode,org.apache.calcite.rel.type.RelDataType,boolean)">encodeValue</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
<a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;decimalType,
boolean&nbsp;checkOverflow)</code></th>
<td class="colLast">
<div class="block">Casts a decimal's integer representation to a decimal node.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected <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="#ensureScale(org.apache.calcite.rex.RexNode,int,int)">ensureScale</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
int&nbsp;scale,
int&nbsp;required)</code></th>
<td class="colLast">
<div class="block">Ensures a value is of a required scale.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>protected <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="#ensureType(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rex.RexNode)">ensureType</a></span>&#8203;(<a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node)</code></th>
<td class="colLast">
<div class="block">Ensures expression is interpreted as a specified type.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>protected <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="#ensureType(org.apache.calcite.rel.type.RelDataType,org.apache.calcite.rex.RexNode,boolean)">ensureType</a></span>&#8203;(<a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node,
boolean&nbsp;matchNullability)</code></th>
<td class="colLast">
<div class="block">Ensures expression is interpreted as a specified type.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>abstract <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="#expand(org.apache.calcite.rex.RexCall)">expand</a></span>&#8203;(<a href="../../rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a>&nbsp;call)</code></th>
<td class="colLast">
<div class="block">Rewrites an expression containing decimals.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>protected <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="#makeApproxLiteral(java.math.BigDecimal)">makeApproxLiteral</a></span>&#8203;(java.math.BigDecimal&nbsp;bd)</code></th>
<td class="colLast">
<div class="block">Makes an approximate literal of double precision</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>protected <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="#makeApproxScaleFactor(int)">makeApproxScaleFactor</a></span>&#8203;(int&nbsp;scale)</code></th>
<td class="colLast">
<div class="block">Makes an approximate literal to be used for scaling</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>protected <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="#makeCase(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode)">makeCase</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;condition,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;thenClause,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;elseClause)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>protected <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="#makeCase(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode)">makeCase</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;whenA,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;thenA,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;whenB,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;thenB,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;elseClause)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>protected <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="#makeDivide(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode)">makeDivide</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;a,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;b)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>protected <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="#makeExactLiteral(long)">makeExactLiteral</a></span>&#8203;(long&nbsp;l)</code></th>
<td class="colLast">
<div class="block">Makes an exact, non-nullable literal of Bigint type</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>protected <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="#makeIsNegative(org.apache.calcite.rex.RexNode)">makeIsNegative</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;a)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>protected <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="#makeIsPositive(org.apache.calcite.rex.RexNode)">makeIsPositive</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;a)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>protected <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="#makeMinus(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode)">makeMinus</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;a,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;b)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>protected <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="#makeMultiply(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode)">makeMultiply</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;a,
<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;b)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>protected <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="#makePlus(org.apache.calcite.rex.RexNode,org.apache.calcite.rex.RexNode)">makePlus</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;a,
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<td class="colLast">&nbsp;</td>
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<tr id="i20" class="altColor">
<td class="colFirst"><code>protected <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="#makeRoundFactor(int)">makeRoundFactor</a></span>&#8203;(int&nbsp;scale)</code></th>
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<div class="block">Makes an exact numeric value to be used for rounding.</div>
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<tr id="i21" class="rowColor">
<td class="colFirst"><code>protected <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="#makeScaleFactor(int)">makeScaleFactor</a></span>&#8203;(int&nbsp;scale)</code></th>
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<div class="block">Makes an exact numeric literal to be used for scaling</div>
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<tr id="i22" class="altColor">
<td class="colFirst"><code>protected long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#powerOfTen(int)">powerOfTen</a></span>&#8203;(int&nbsp;scale)</code></th>
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<div class="block">Calculates a power of ten, as a long value</div>
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<tr id="i23" class="rowColor">
<td class="colFirst"><code>protected <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="#scaleDown(org.apache.calcite.rex.RexNode,int)">scaleDown</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
int&nbsp;scale)</code></th>
<td class="colLast">
<div class="block">Scales down a decimal value, and returns the scaled value as an exact
numeric.</div>
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<tr id="i24" class="altColor">
<td class="colFirst"><code>protected <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="#scaleDownDouble(org.apache.calcite.rex.RexNode,int)">scaleDownDouble</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
int&nbsp;scale)</code></th>
<td class="colLast">
<div class="block">Scales down a decimal value and returns the scaled value as a an
double precision approximate value.</div>
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<tr id="i25" class="rowColor">
<td class="colFirst"><code>protected <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="#scaleUp(org.apache.calcite.rex.RexNode,int)">scaleUp</a></span>&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
int&nbsp;scale)</code></th>
<td class="colLast">
<div class="block">Scales up a decimal value and returns the scaled value as an exact
number.</div>
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<pre><a href="../../rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a> builder</pre>
<div class="block">Factory for constructing new relational expressions</div>
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<div class="block">Type for the internal representation of decimals. This type is a
non-nullable type and requires extra work to make it nullable.</div>
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<div class="block">Type for doubles. This type is a non-nullable type and requires extra
work to make it nullable.</div>
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<div class="block">Constructs a RexExpander</div>
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<div class="block">This defaults to the utility method,
<a href="../../rex/RexUtil.html#requiresDecimalExpansion(org.apache.calcite.rex.RexNode,boolean)"><code>RexUtil.requiresDecimalExpansion(RexNode, boolean)</code></a> which checks
general guidelines on whether a rewrite should be considered at all. In
general, it is helpful to update the utility method since that method is
often used to filter the somewhat expensive rewrite process.
<p>However, this method provides another place for implementations of
RexExpander to make a more detailed analysis before deciding on
whether to perform a rewrite.</div>
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<div class="block">Rewrites an expression containing decimals. Normally, this method
always performs a rewrite, but implementations may choose to return
the original expression if no change was required.</div>
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<div class="block">Makes an exact numeric literal to be used for scaling</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scale</code> - a scale from one to max precision - 1</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>10^scale as an exact numeric value</dd>
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<div class="block">Makes an approximate literal to be used for scaling</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scale</code> - a scale from -99 to 99</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>10^scale as an approximate value</dd>
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<div class="block">Makes an exact numeric value to be used for rounding.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>scale</code> - a scale from 1 to max precision - 1</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>10^scale / 2 as an exact numeric value</dd>
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<pre class="methodSignature">protected&nbsp;long&nbsp;powerOfTen&#8203;(int&nbsp;scale)</pre>
<div class="block">Calculates a power of ten, as a long value</div>
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<div class="block">Makes an exact, non-nullable literal of Bigint type</div>
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<div class="block">Makes an approximate literal of double precision</div>
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int&nbsp;scale)</pre>
<div class="block">Scales up a decimal value and returns the scaled value as an exact
number.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - the integer representation of a decimal</dd>
<dd><code>scale</code> - a value from zero to max precision - 1</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>value * 10^scale as an exact numeric value</dd>
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int&nbsp;scale)</pre>
<div class="block">Scales down a decimal value, and returns the scaled value as an exact
numeric. with the rounding convention
<code>BigDecimal.ROUND_HALF_UP</code>. (Values midway
between two points are rounded away from zero.)</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - the integer representation of a decimal</dd>
<dd><code>scale</code> - a value from zero to max precision</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>value/10^scale, rounded away from zero and returned as an
exact numeric value</dd>
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<pre class="methodSignature">protected&nbsp;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;scaleDownDouble&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
int&nbsp;scale)</pre>
<div class="block">Scales down a decimal value and returns the scaled value as a an
double precision approximate value. Scaling is implemented with
double precision arithmetic.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - the integer representation of a decimal</dd>
<dd><code>scale</code> - a value from zero to max precision</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>value/10^scale as a double precision value</dd>
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<pre class="methodSignature">protected&nbsp;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;ensureScale&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
int&nbsp;scale,
int&nbsp;required)</pre>
<div class="block">Ensures a value is of a required scale. If it is not, then the value
is multiplied by a scale factor. Scaling up an exact value is limited
to max precision - 1, because we cannot represent the result of
larger scales internally. Scaling up a floating point value is more
flexible since the value may be very small despite having a scale of
zero and the scaling may still produce a reasonable result</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - integer representation of decimal, or a floating point
number</dd>
<dd><code>scale</code> - current scale, 0 for floating point numbers</dd>
<dd><code>required</code> - required scale, must be at least the current scale;
the scale difference may not be greater than max
precision - 1 for exact numerics</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>value * 10^scale, returned as an exact or approximate value
corresponding to the input value</dd>
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<a id="decodeValue(org.apache.calcite.rex.RexNode)">
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<pre class="methodSignature">protected&nbsp;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;decodeValue&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;decimalNode)</pre>
<div class="block">Retrieves a decimal node's integer representation</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>decimalNode</code> - the decimal value as an opaque type</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an integer representation of the decimal value</dd>
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<pre class="methodSignature">protected&nbsp;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;accessValue&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node)</pre>
<div class="block">Retrieves the primitive value of a numeric node. If the node is a
decimal, then it must first be decoded. Otherwise the original node
may be returned.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>node</code> - a numeric node, possibly a decimal</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the primitive value of the numeric node</dd>
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<pre class="methodSignature">protected&nbsp;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;encodeValue&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
<a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;decimalType)</pre>
<div class="block">Casts a decimal's integer representation to a decimal node. If the
expression is not the expected integer type, then it is casted first.
<p>This method does not request an overflow check.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - integer representation of decimal</dd>
<dd><code>decimalType</code> - type integer will be reinterpreted as</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the integer representation reinterpreted as a decimal type</dd>
</dl>
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<pre class="methodSignature">protected&nbsp;<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;encodeValue&#8203;(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;value,
<a href="../type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;decimalType,
boolean&nbsp;checkOverflow)</pre>
<div class="block">Casts a decimal's integer representation to a decimal node. If the
expression is not the expected integer type, then it is casted first.
<p>An overflow check may be requested to ensure the internal value
does not exceed the maximum value of the decimal type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - integer representation of decimal</dd>
<dd><code>decimalType</code> - type integer will be reinterpreted as</dd>
<dd><code>checkOverflow</code> - indicates whether an overflow check is required
when reinterpreting this particular value as the
decimal type. A check usually not required for
arithmetic, but is often required for rounding and
explicit casts.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the integer reinterpreted as an opaque decimal type</dd>
</dl>
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<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node)</pre>
<div class="block">Ensures expression is interpreted as a specified type. The returned
expression may be wrapped with a cast.
<p>This method corrects the nullability of the specified type to
match the nullability of the expression.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>type</code> - desired type</dd>
<dd><code>node</code> - expression</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a casted expression or the original expression</dd>
</dl>
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<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;node,
boolean&nbsp;matchNullability)</pre>
<div class="block">Ensures expression is interpreted as a specified type. The returned
expression may be wrapped with a cast.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>type</code> - desired type</dd>
<dd><code>node</code> - expression</dd>
<dd><code>matchNullability</code> - whether to correct nullability of specified
type to match the expression; this usually should
be true, except for explicit casts which can
override default nullability</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a casted expression or the original expression</dd>
</dl>
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