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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.sql2rel</a></div> |
| <h2 title="Class SqlToRelConverter.HistogramShuttle" class="title">Class SqlToRelConverter.HistogramShuttle</h2> |
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| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../rex/RexShuttle.html" title="class in org.apache.calcite.rex">org.apache.calcite.rex.RexShuttle</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.sql2rel.SqlToRelConverter.HistogramShuttle</li> |
| </ul> |
| </li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="../rex/RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a><<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>></code></dd> |
| </dl> |
| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="SqlToRelConverter.html" title="class in org.apache.calcite.sql2rel">SqlToRelConverter</a></dd> |
| </dl> |
| <hr> |
| <pre>private class <span class="typeNameLabel">SqlToRelConverter.HistogramShuttle</span> |
| extends <a href="../rex/RexShuttle.html" title="class in org.apache.calcite.rex">RexShuttle</a></pre> |
| <div class="block">Shuttle which walks over a tree of <a href="../rex/RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a>s and applies 'over' to |
| all agg functions. |
| |
| <p>This is necessary because the returned expression is not necessarily a |
| call to an agg function. For example, |
| |
| <blockquote><code>AVG(x)</code></blockquote> |
| |
| <p>becomes |
| |
| <blockquote><code>SUM(x) / COUNT(x)</code></blockquote> |
| |
| <p>Any aggregate functions are converted to calls to the internal <code> |
| $Histogram</code> aggregation function and accessors such as <code> |
| $HistogramMin</code>; for example, |
| |
| <blockquote><code>MIN(x), MAX(x)</code></blockquote> |
| |
| <p>are converted to |
| |
| <blockquote><code>$HistogramMin($Histogram(x)), |
| $HistogramMax($Histogram(x))</code></blockquote> |
| |
| <p>Common sub-expression elimination will ensure that only one histogram is |
| computed.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- =========== FIELD SUMMARY =========== --> |
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| </a> |
| <h3>Field Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#distinct">distinct</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ENABLE_HISTOGRAM_AGG">ENABLE_HISTOGRAM_AGG</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Whether to convert calls to MIN(x) to HISTOGRAM_MIN(HISTOGRAM(x)).</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ignoreNulls">ignoreNulls</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#lowerBound">lowerBound</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private com.google.common.collect.ImmutableList<<a href="../rex/RexFieldCollation.html" title="class in org.apache.calcite.rex">RexFieldCollation</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#orderKeys">orderKeys</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private java.util.List<<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="#partitionKeys">partitionKeys</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#upperBound">upperBound</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../sql/SqlWindow.html" title="class in org.apache.calcite.sql">SqlWindow</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#window">window</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="constructor.summary"> |
| <!-- --> |
| </a> |
| <h3>Constructor Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.util.List,com.google.common.collect.ImmutableList,org.apache.calcite.rex.RexWindowBound,org.apache.calcite.rex.RexWindowBound,org.apache.calcite.sql.SqlWindow,boolean,boolean)">HistogramShuttle</a></span>​(java.util.List<<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> partitionKeys, |
| com.google.common.collect.ImmutableList<<a href="../rex/RexFieldCollation.html" title="class in org.apache.calcite.rex">RexFieldCollation</a>> orderKeys, |
| <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a> lowerBound, |
| <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a> upperBound, |
| <a href="../sql/SqlWindow.html" title="class in org.apache.calcite.sql">SqlWindow</a> window, |
| boolean distinct, |
| boolean ignoreNulls)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="method.summary"> |
| <!-- --> |
| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>private <a href="../rel/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="#computeHistogramType(org.apache.calcite.rel.type.RelDataType)">computeHistogramType</a></span>​(<a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> type)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the type for a histogram function.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) <a href="../sql/SqlFunction.html" title="class in org.apache.calcite.sql">SqlFunction</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getHistogramOp(org.apache.calcite.sql.SqlAggFunction)">getHistogramOp</a></span>​(<a href="../sql/SqlAggFunction.html" title="class in org.apache.calcite.sql">SqlAggFunction</a> aggFunction)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the histogram operator corresponding to a given aggregate |
| function.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><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="#visitCall(org.apache.calcite.rex.RexCall)">visitCall</a></span>​(<a href="../rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a> call)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.org.apache.calcite.rex.RexShuttle"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.calcite.rex.<a href="../rex/RexShuttle.html" title="class in org.apache.calcite.rex">RexShuttle</a></h3> |
| <code><a href="../rex/RexShuttle.html#apply(java.lang.Iterable)">apply</a>, <a href="../rex/RexShuttle.html#apply(java.util.List)">apply</a>, <a href="../rex/RexShuttle.html#apply(org.apache.calcite.rex.RexNode)">apply</a>, <a href="../rex/RexShuttle.html#mutate(java.util.List)">mutate</a>, <a href="../rex/RexShuttle.html#visitArray(org.apache.calcite.rex.RexNode%5B%5D,boolean%5B%5D)">visitArray</a>, <a href="../rex/RexShuttle.html#visitCorrelVariable(org.apache.calcite.rex.RexCorrelVariable)">visitCorrelVariable</a>, <a href="../rex/RexShuttle.html#visitDynamicParam(org.apache.calcite.rex.RexDynamicParam)">visitDynamicParam</a>, <a href="../rex/RexShuttle.html#visitFieldAccess(org.apache.calcite.rex.RexFieldAccess)">visitFieldAccess</a>, <a href="../rex/RexShuttle.html#visitFieldCollations(java.util.List,boolean%5B%5D)">visitFieldCollations</a>, <a href="../rex/RexShuttle.html#visitInputRef(org.apache.calcite.rex.RexInputRef)">visitInputRef</a>, <a href="../rex/RexShuttle.html#visitList(java.util.List,boolean%5B%5D)">visitList</a>, <a href="../rex/RexShuttle.html#visitList(java.util.List,java.util.List)">visitList</a>, <a href="../rex/RexShuttle.html#visitLiteral(org.apache.calcite.rex.RexLiteral)">visitLiteral</a>, <a href="../rex/RexShuttle.html#visitLocalRef(org.apache.calcite.rex.RexLocalRef)">visitLocalRef</a>, <a href="../rex/RexShuttle.html#visitOver(org.apache.calcite.rex.RexOver)">visitOver</a>, <a href="../rex/RexShuttle.html#visitPatternFieldRef(org.apache.calcite.rex.RexPatternFieldRef)">visitPatternFieldRef</a>, <a href="../rex/RexShuttle.html#visitRangeRef(org.apache.calcite.rex.RexRangeRef)">visitRangeRef</a>, <a href="../rex/RexShuttle.html#visitSubQuery(org.apache.calcite.rex.RexSubQuery)">visitSubQuery</a>, <a href="../rex/RexShuttle.html#visitTableInputRef(org.apache.calcite.rex.RexTableInputRef)">visitTableInputRef</a>, <a href="../rex/RexShuttle.html#visitWindow(org.apache.calcite.rex.RexWindow)">visitWindow</a></code></li> |
| </ul> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="field.detail"> |
| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a id="ENABLE_HISTOGRAM_AGG"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>ENABLE_HISTOGRAM_AGG</h4> |
| <pre>static final boolean ENABLE_HISTOGRAM_AGG</pre> |
| <div class="block">Whether to convert calls to MIN(x) to HISTOGRAM_MIN(HISTOGRAM(x)). |
| Histograms allow rolling computation, but require more space.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.apache.calcite.sql2rel.SqlToRelConverter.HistogramShuttle.ENABLE_HISTOGRAM_AGG">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="partitionKeys"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>partitionKeys</h4> |
| <pre>private final java.util.List<<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> partitionKeys</pre> |
| </li> |
| </ul> |
| <a id="orderKeys"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>orderKeys</h4> |
| <pre>private final com.google.common.collect.ImmutableList<<a href="../rex/RexFieldCollation.html" title="class in org.apache.calcite.rex">RexFieldCollation</a>> orderKeys</pre> |
| </li> |
| </ul> |
| <a id="lowerBound"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>lowerBound</h4> |
| <pre>private final <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a> lowerBound</pre> |
| </li> |
| </ul> |
| <a id="upperBound"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>upperBound</h4> |
| <pre>private final <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a> upperBound</pre> |
| </li> |
| </ul> |
| <a id="window"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>window</h4> |
| <pre>private final <a href="../sql/SqlWindow.html" title="class in org.apache.calcite.sql">SqlWindow</a> window</pre> |
| </li> |
| </ul> |
| <a id="distinct"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>distinct</h4> |
| <pre>private final boolean distinct</pre> |
| </li> |
| </ul> |
| <a id="ignoreNulls"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ignoreNulls</h4> |
| <pre>private final boolean ignoreNulls</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a id="<init>(java.util.List,com.google.common.collect.ImmutableList,org.apache.calcite.rex.RexWindowBound,org.apache.calcite.rex.RexWindowBound,org.apache.calcite.sql.SqlWindow,boolean,boolean)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>HistogramShuttle</h4> |
| <pre>HistogramShuttle​(java.util.List<<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> partitionKeys, |
| com.google.common.collect.ImmutableList<<a href="../rex/RexFieldCollation.html" title="class in org.apache.calcite.rex">RexFieldCollation</a>> orderKeys, |
| <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a> lowerBound, |
| <a href="../rex/RexWindowBound.html" title="class in org.apache.calcite.rex">RexWindowBound</a> upperBound, |
| <a href="../sql/SqlWindow.html" title="class in org.apache.calcite.sql">SqlWindow</a> window, |
| boolean distinct, |
| boolean ignoreNulls)</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ============ METHOD DETAIL ========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a id="visitCall(org.apache.calcite.rex.RexCall)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>visitCall</h4> |
| <pre class="methodSignature">public <a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> visitCall​(<a href="../rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a> call)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../rex/RexVisitor.html#visitCall(org.apache.calcite.rex.RexCall)">visitCall</a></code> in interface <code><a href="../rex/RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a><<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>></code></dd> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../rex/RexShuttle.html#visitCall(org.apache.calcite.rex.RexCall)">visitCall</a></code> in class <code><a href="../rex/RexShuttle.html" title="class in org.apache.calcite.rex">RexShuttle</a></code></dd> |
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| <a id="getHistogramOp(org.apache.calcite.sql.SqlAggFunction)"> |
| <!-- --> |
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| <h4>getHistogramOp</h4> |
| <pre class="methodSignature"><a href="../sql/SqlFunction.html" title="class in org.apache.calcite.sql">SqlFunction</a> getHistogramOp​(<a href="../sql/SqlAggFunction.html" title="class in org.apache.calcite.sql">SqlAggFunction</a> aggFunction)</pre> |
| <div class="block">Returns the histogram operator corresponding to a given aggregate |
| function. |
| |
| <p>For example, <code>getHistogramOp |
| (<a href="../sql/fun/SqlStdOperatorTable.html#MIN"><code>SqlStdOperatorTable.MIN</code></a>}</code> returns |
| <a href="../sql/fun/SqlStdOperatorTable.html#HISTOGRAM_MIN"><code>SqlStdOperatorTable.HISTOGRAM_MIN</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>aggFunction</code> - An aggregate function</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Its histogram function, or null</dd> |
| </dl> |
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| <a id="computeHistogramType(org.apache.calcite.rel.type.RelDataType)"> |
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| </a> |
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| <h4>computeHistogramType</h4> |
| <pre class="methodSignature">private <a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> computeHistogramType​(<a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> type)</pre> |
| <div class="block">Returns the type for a histogram function. It is either the actual |
| type or an an approximation to it.</div> |
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