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| <h2 title="Class NumericEquiDepthHistogram" class="title">Class NumericEquiDepthHistogram</h2> |
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| <li>org.apache.drill.exec.planner.common.NumericEquiDepthHistogram</li> |
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| <pre>public class <span class="typeNameLabel">NumericEquiDepthHistogram</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../../org/apache/drill/metastore/statistics/Histogram.html" title="interface in org.apache.drill.metastore.statistics">Histogram</a></pre> |
| <div class="block">A column specific equi-depth histogram which is meant for numeric data types</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#NumericEquiDepthHistogram--">NumericEquiDepthHistogram</a></span>()</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#NumericEquiDepthHistogram-int-">NumericEquiDepthHistogram</a></span>(int numBuckets)</code> </td> |
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| <td class="colFirst"><code>static <a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html" title="class in org.apache.drill.exec.planner.common">NumericEquiDepthHistogram</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#buildFromTDigest-byte:A-int-long-">buildFromTDigest</a></span>(byte[] tdigest_array, |
| int numBuckets, |
| long nonNullCount)</code> |
| <div class="block">Build a Numeric Equi-Depth Histogram from a t-digest byte array</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#estimatedSelectivity-org.apache.calcite.rex.RexNode-long-long-">estimatedSelectivity</a></span>(org.apache.calcite.rex.RexNode columnFilter, |
| long totalRowCount, |
| long ndv)</code> |
| <div class="block">Estimate the selectivity of a filter which may contain several range predicates and in the general case is of |
| type: col op value1 AND col op value2 AND col op value3 ...</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#getBuckets--">getBuckets</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#getNumBuckets--">getNumBuckets</a></span>()</code> |
| <div class="block">Get the number of buckets in the histogram |
| number of buckets is 1 less than the total # entries in the buckets array since last |
| entry is the end point of the last bucket</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#getNumRowsPerBucket--">getNumRowsPerBucket</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>protected long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#getSelectedRows-org.apache.drill.shaded.guava.com.google.common.collect.Range-long-">getSelectedRows</a></span>(org.apache.drill.shaded.guava.com.google.common.collect.Range range, |
| long ndv)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#setBucketValue-int-java.lang.Double-">setBucketValue</a></span>(int index, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a> value)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html#setNumRowsPerBucket-double-">setNumRowsPerBucket</a></span>(double numRows)</code> </td> |
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| <h4>NumericEquiDepthHistogram</h4> |
| <pre>public NumericEquiDepthHistogram()</pre> |
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| <h4>NumericEquiDepthHistogram</h4> |
| <pre>public NumericEquiDepthHistogram(int numBuckets)</pre> |
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| <pre>public double getNumRowsPerBucket()</pre> |
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| <pre>public void setNumRowsPerBucket(double numRows)</pre> |
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| <a name="getBuckets--"> |
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| <h4>getBuckets</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a>[] getBuckets()</pre> |
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| <h4>setBucketValue</h4> |
| <pre>protected void setBucketValue(int index, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a> value)</pre> |
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| <h4>getNumBuckets</h4> |
| <pre>public int getNumBuckets()</pre> |
| <div class="block">Get the number of buckets in the histogram |
| number of buckets is 1 less than the total # entries in the buckets array since last |
| entry is the end point of the last bucket</div> |
| </li> |
| </ul> |
| <a name="estimatedSelectivity-org.apache.calcite.rex.RexNode-long-long-"> |
| <!-- --> |
| </a> |
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| <h4>estimatedSelectivity</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a> estimatedSelectivity(org.apache.calcite.rex.RexNode columnFilter, |
| long totalRowCount, |
| long ndv)</pre> |
| <div class="block">Estimate the selectivity of a filter which may contain several range predicates and in the general case is of |
| type: col op value1 AND col op value2 AND col op value3 ... |
| <p> |
| e.g a > 10 AND a < 50 AND a >= 20 AND a <= 70 ... |
| </p> |
| Even though in most cases it will have either 1 or 2 range conditions, we still have to handle the general case |
| For each conjunct, we will find the histogram bucket ranges and intersect them, taking into account that the |
| first and last bucket may be partially covered and all other buckets in the middle are fully covered.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/drill/metastore/statistics/Histogram.html#estimatedSelectivity-org.apache.calcite.rex.RexNode-long-long-">estimatedSelectivity</a></code> in interface <code><a href="../../../../../../org/apache/drill/metastore/statistics/Histogram.html" title="interface in org.apache.drill.metastore.statistics">Histogram</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>estimated selectivity or NULL if it could not be estimated for any reason</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSelectedRows-org.apache.drill.shaded.guava.com.google.common.collect.Range-long-"> |
| <!-- --> |
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| <h4>getSelectedRows</h4> |
| <pre>protected long getSelectedRows(org.apache.drill.shaded.guava.com.google.common.collect.Range range, |
| long ndv)</pre> |
| </li> |
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| <h4>buildFromTDigest</h4> |
| <pre>public static <a href="../../../../../../org/apache/drill/exec/planner/common/NumericEquiDepthHistogram.html" title="class in org.apache.drill.exec.planner.common">NumericEquiDepthHistogram</a> buildFromTDigest(byte[] tdigest_array, |
| int numBuckets, |
| long nonNullCount)</pre> |
| <div class="block">Build a Numeric Equi-Depth Histogram from a t-digest byte array</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tdigest_array</code> - </dd> |
| <dd><code>numBuckets</code> - </dd> |
| <dd><code>nonNullCount</code> - </dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>An instance of NumericEquiDepthHistogram</dd> |
| </dl> |
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