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| <div class="subTitle">org.apache.calcite.rel.rules</div> |
| <h2 title="类 ReduceDecimalsRule.RexExpander" class="title">类 ReduceDecimalsRule.RexExpander</h2> |
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| <li>org.apache.calcite.rel.rules.ReduceDecimalsRule.RexExpander</li> |
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| <dl> |
| <dt>封闭类:</dt> |
| <dd><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.html" title="org.apache.calcite.rel.rules中的类">ReduceDecimalsRule</a></dd> |
| </dl> |
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| <br> |
| <pre>public abstract class <span class="typeNameLabel">ReduceDecimalsRule.RexExpander</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></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 |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html?is-external=true#unscaledValue--" title="java.math中的类或接口"><code>BigDecimal.unscaledValue()</code></a> (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> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
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| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <h3>构造器概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="构造器概要表, 列表构造器和解释"> |
| <caption><span>构造器</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">构造器和说明</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#RexExpander-org.apache.calcite.rex.RexBuilder-">RexExpander</a></span>(<a href="../../../../../org/apache/calcite/rex/RexBuilder.html" title="org.apache.calcite.rex中的类">RexBuilder</a> builder)</code> |
| <div class="block">Constructs a RexExpander</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <h3>方法概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释"> |
| <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">方法和说明</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#accessValue-org.apache.calcite.rex.RexNode-">accessValue</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> node)</code> |
| <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> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#canExpand-org.apache.calcite.rex.RexCall-">canExpand</a></span>(<a href="../../../../../org/apache/calcite/rex/RexCall.html" title="org.apache.calcite.rex中的类">RexCall</a> call)</code> |
| <div class="block">This defaults to the utility method, |
| <a href="../../../../../org/apache/calcite/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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#decodeValue-org.apache.calcite.rex.RexNode-">decodeValue</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> decimalNode)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#encodeValue-org.apache.calcite.rex.RexNode-org.apache.calcite.rel.type.RelDataType-">encodeValue</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> decimalType)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#encodeValue-org.apache.calcite.rex.RexNode-org.apache.calcite.rel.type.RelDataType-boolean-">encodeValue</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> decimalType, |
| boolean checkOverflow)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#ensureScale-org.apache.calcite.rex.RexNode-int-int-">ensureScale</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int scale, |
| int required)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#ensureType-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rex.RexNode-">ensureType</a></span>(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> node)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#ensureType-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rex.RexNode-boolean-">ensureType</a></span>(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> node, |
| boolean matchNullability)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#expand-org.apache.calcite.rex.RexCall-">expand</a></span>(<a href="../../../../../org/apache/calcite/rex/RexCall.html" title="org.apache.calcite.rex中的类">RexCall</a> call)</code> |
| <div class="block">Rewrites an expression containing decimals.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeApproxLiteral-java.math.BigDecimal-">makeApproxLiteral</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html?is-external=true" title="java.math中的类或接口">BigDecimal</a> bd)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeApproxScaleFactor-int-">makeApproxScaleFactor</a></span>(int scale)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeCase-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-">makeCase</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> condition, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> thenClause, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> elseClause)</code> </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#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>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> whenA, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> thenA, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> whenB, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> thenB, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> elseClause)</code> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeDivide-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-">makeDivide</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</code> </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeExactLiteral-long-">makeExactLiteral</a></span>(long l)</code> |
| <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="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeIsNegative-org.apache.calcite.rex.RexNode-">makeIsNegative</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a)</code> </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeIsPositive-org.apache.calcite.rex.RexNode-">makeIsPositive</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a)</code> </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeMinus-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-">makeMinus</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</code> </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeMultiply-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-">makeMultiply</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</code> </td> |
| </tr> |
| <tr id="i19" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makePlus-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-">makePlus</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</code> </td> |
| </tr> |
| <tr id="i20" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeRoundFactor-int-">makeRoundFactor</a></span>(int scale)</code> |
| <div class="block">Makes an exact numeric value to be used for rounding.</div> |
| </td> |
| </tr> |
| <tr id="i21" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#makeScaleFactor-int-">makeScaleFactor</a></span>(int scale)</code> |
| <div class="block">Makes an exact numeric literal to be used for scaling</div> |
| </td> |
| </tr> |
| <tr id="i22" class="altColor"> |
| <td class="colFirst"><code>protected long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#powerOfTen-int-">powerOfTen</a></span>(int scale)</code> |
| <div class="block">Calculates a power of ten, as a long value</div> |
| </td> |
| </tr> |
| <tr id="i23" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#scaleDown-org.apache.calcite.rex.RexNode-int-">scaleDown</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int scale)</code> |
| <div class="block">Scales down a decimal value, and returns the scaled value as an exact |
| numeric. with the rounding convention |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html?is-external=true#ROUND_HALF_UP" title="java.math中的类或接口"><code>BigDecimal.ROUND_HALF_UP</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i24" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#scaleDownDouble-org.apache.calcite.rex.RexNode-int-">scaleDownDouble</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int scale)</code> |
| <div class="block">Scales down a decimal value and returns the scaled value as a an |
| double precision approximate value.</div> |
| </td> |
| </tr> |
| <tr id="i25" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/rules/ReduceDecimalsRule.RexExpander.html#scaleUp-org.apache.calcite.rex.RexNode-int-">scaleUp</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int scale)</code> |
| <div class="block">Scales up a decimal value and returns the scaled value as an exact |
| number.</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>从类继承的方法 java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="java.lang中的类或接口">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="java.lang中的类或接口">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="java.lang中的类或接口">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="java.lang中的类或接口">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="java.lang中的类或接口">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="java.lang中的类或接口">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="java.lang中的类或接口">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="java.lang中的类或接口">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="java.lang中的类或接口">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| </a> |
| <h3>构造器详细资料</h3> |
| <a name="RexExpander-org.apache.calcite.rex.RexBuilder-"> |
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| </a> |
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| <h4>RexExpander</h4> |
| <pre>public RexExpander(<a href="../../../../../org/apache/calcite/rex/RexBuilder.html" title="org.apache.calcite.rex中的类">RexBuilder</a> builder)</pre> |
| <div class="block">Constructs a RexExpander</div> |
| </li> |
| </ul> |
| </li> |
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| <h3>方法详细资料</h3> |
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| <h4>canExpand</h4> |
| <pre>public boolean canExpand(<a href="../../../../../org/apache/calcite/rex/RexCall.html" title="org.apache.calcite.rex中的类">RexCall</a> call)</pre> |
| <div class="block">This defaults to the utility method, |
| <a href="../../../../../org/apache/calcite/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> |
| </li> |
| </ul> |
| <a name="expand-org.apache.calcite.rex.RexCall-"> |
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| <h4>expand</h4> |
| <pre>public abstract <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> expand(<a href="../../../../../org/apache/calcite/rex/RexCall.html" title="org.apache.calcite.rex中的类">RexCall</a> call)</pre> |
| <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> |
| </li> |
| </ul> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeScaleFactor(int scale)</pre> |
| <div class="block">Makes an exact numeric literal to be used for scaling</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>scale</code> - a scale from one to max precision - 1</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>10^scale as an exact numeric value</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>makeApproxScaleFactor</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeApproxScaleFactor(int scale)</pre> |
| <div class="block">Makes an approximate literal to be used for scaling</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>scale</code> - a scale from -99 to 99</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>10^scale as an approximate value</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>makeRoundFactor</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeRoundFactor(int scale)</pre> |
| <div class="block">Makes an exact numeric value to be used for rounding.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>scale</code> - a scale from 1 to max precision - 1</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>10^scale / 2 as an exact numeric value</dd> |
| </dl> |
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| <h4>powerOfTen</h4> |
| <pre>protected long powerOfTen(int scale)</pre> |
| <div class="block">Calculates a power of ten, as a long value</div> |
| </li> |
| </ul> |
| <a name="makeExactLiteral-long-"> |
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| <h4>makeExactLiteral</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeExactLiteral(long l)</pre> |
| <div class="block">Makes an exact, non-nullable literal of Bigint type</div> |
| </li> |
| </ul> |
| <a name="makeApproxLiteral-java.math.BigDecimal-"> |
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| <h4>makeApproxLiteral</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeApproxLiteral(<a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html?is-external=true" title="java.math中的类或接口">BigDecimal</a> bd)</pre> |
| <div class="block">Makes an approximate literal of double precision</div> |
| </li> |
| </ul> |
| <a name="scaleUp-org.apache.calcite.rex.RexNode-int-"> |
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| <h4>scaleUp</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> scaleUp(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int 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">参数:</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">返回:</span></dt> |
| <dd>value * 10^scale as an exact numeric value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="scaleDown-org.apache.calcite.rex.RexNode-int-"> |
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| <h4>scaleDown</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> scaleDown(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int scale)</pre> |
| <div class="block">Scales down a decimal value, and returns the scaled value as an exact |
| numeric. with the rounding convention |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/math/BigDecimal.html?is-external=true#ROUND_HALF_UP" title="java.math中的类或接口"><code>BigDecimal.ROUND_HALF_UP</code></a>. (Values midway |
| between two points are rounded away from zero.)</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</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">返回:</span></dt> |
| <dd>value/10^scale, rounded away from zero and returned as an |
| exact numeric value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="scaleDownDouble-org.apache.calcite.rex.RexNode-int-"> |
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| <h4>scaleDownDouble</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> scaleDownDouble(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int 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">参数:</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">返回:</span></dt> |
| <dd>value/10^scale as a double precision value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="ensureScale-org.apache.calcite.rex.RexNode-int-int-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>ensureScale</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> ensureScale(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| int scale, |
| int 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">参数:</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">返回:</span></dt> |
| <dd>value * 10^scale, returned as an exact or approximate value |
| corresponding to the input value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="decodeValue-org.apache.calcite.rex.RexNode-"> |
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| </a> |
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| <h4>decodeValue</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> decodeValue(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> decimalNode)</pre> |
| <div class="block">Retrieves a decimal node's integer representation</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>decimalNode</code> - the decimal value as an opaque type</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>an integer representation of the decimal value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="accessValue-org.apache.calcite.rex.RexNode-"> |
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| </a> |
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| <h4>accessValue</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> accessValue(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> 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">参数:</span></dt> |
| <dd><code>node</code> - a numeric node, possibly a decimal</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>the primitive value of the numeric node</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="encodeValue-org.apache.calcite.rex.RexNode-org.apache.calcite.rel.type.RelDataType-"> |
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| <h4>encodeValue</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> encodeValue(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> 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">参数:</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">返回:</span></dt> |
| <dd>the integer representation reinterpreted as a decimal type</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="encodeValue-org.apache.calcite.rex.RexNode-org.apache.calcite.rel.type.RelDataType-boolean-"> |
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| <h4>encodeValue</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> encodeValue(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> value, |
| <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> decimalType, |
| boolean 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">参数:</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">返回:</span></dt> |
| <dd>the integer reinterpreted as an opaque decimal type</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="ensureType-org.apache.calcite.rel.type.RelDataType-org.apache.calcite.rex.RexNode-"> |
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| </a> |
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| <h4>ensureType</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> ensureType(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> 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">参数:</span></dt> |
| <dd><code>type</code> - desired type</dd> |
| <dd><code>node</code> - expression</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>a casted expression or the original expression</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>ensureType</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> ensureType(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> type, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> node, |
| boolean 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">参数:</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">返回:</span></dt> |
| <dd>a casted expression or the original expression</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeCase(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> condition, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> thenClause, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> elseClause)</pre> |
| </li> |
| </ul> |
| <a name="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-"> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeCase(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> whenA, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> thenA, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> whenB, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> thenB, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> elseClause)</pre> |
| </li> |
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| <h4>makePlus</h4> |
| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makePlus(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</pre> |
| </li> |
| </ul> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeMinus(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</pre> |
| </li> |
| </ul> |
| <a name="makeDivide-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-"> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeDivide(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</pre> |
| </li> |
| </ul> |
| <a name="makeMultiply-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-"> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeMultiply(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a, |
| <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> b)</pre> |
| </li> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeIsPositive(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a)</pre> |
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| <pre>protected <a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> makeIsNegative(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> a)</pre> |
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