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<h4>API Snapshots:
<a href="https://apache.github.io/datasketches-java/4.2.0/">Java Core</a>,
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<li><a href="/docs/Background/TheChallenge.html">•The Challenge</a></li>
<li><a href="/docs/Background/SketchOrigins.html">•Sketch Origins</a></li>
<li><a href="/docs/Background/SketchElements.html">•Sketch Elements</a></li>
<li><a href="/docs/Background/Presentations.html">•Presentations</a></li>
<li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/DataSketches_deck.pdf">•Overview Slide Deck</a></li>
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<li><a href="/docs/Architecture/MajorSketchFamilies.html">•The Major Sketch Families</a></li>
<li><a href="/docs/Architecture/LargeScale.html">•Large Scale Computing</a></li>
<li><a href="/docs/Architecture/KeyFeatures.html">•Key Features</a></li>
<li><a href="/docs/Architecture/SketchFeaturesMatrix.html">•Sketch Features Matrix</a></li>
<li><a href="/docs/Architecture/Components.html">•Components</a></li>
<li><a href="/docs/Architecture/SketchesByComponent.html">•Sketches by Component</a></li>
<li><a href="/docs/Architecture/SketchCriteria.html">•Sketch Criteria</a></li>
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<li><a href="/docs/Memory/MemoryComponent.html">•Memory Component</a></li>
<li><a href="/docs/Memory/MemoryPerformance.html">•Memory Component Performance</a></li>
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<li><a href="/docs/Architecture/OrderSensitivity.html">•Notes on Order Sensitivity</a></li>
<li><a href="/docs/Architecture/Concurrency.html">•Notes on Concurrency</a></li>
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<li><a href="/docs/DistinctCountFeaturesMatrix.html">•Features Matrix</a></li>
<li><a href="/docs/DistinctCountMeritComparisons.html">•Figures-of-Merit Comparison</a></li>
<p id="cpc-sketches">
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<li><a href="/docs/CPC/CPC.html">•CPC Sketch</a></li>
<li><a href="/docs/CPC/CpcPerformance.html">•CPC Sketch Performance</a></li>
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<li><a href="/docs/CPC/CpcJavaExample.html">•CPC Sketch Java Example</a></li>
<li><a href="/docs/CPC/CpcCppExample.html">•CPC Sketch C++ Example</a></li>
<li><a href="/docs/CPC/CpcPigExample.html">•CPC Sketch Pig UDFs</a></li>
<li><a href="/docs/CPC/CpcHiveExample.html">•CPC Sketch Hive UDFs</a></li>
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<p id="hyperloglog-sketches">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_hyperloglog_sketches">HyperLogLog Sketches</a>
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<li><a href="/docs/HLL/HLL.html">•HLL Sketch</a></li>
<li><a href="/docs/HLL/HllMap.html">•HLL Map Sketch</a></li>
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<li><a href="/docs/HLL/HllJavaExample.html">•HLL Sketch Java Example</a></li>
<li><a href="/docs/HLL/HllCppExample.html">•HLL Sketch C++ Example</a></li>
<li><a href="/docs/HLL/HllPigUDFs.html">•HLL Sketch Pig UDFs</a></li>
<li><a href="/docs/HLL/HllHiveUDFs.html">•HLL Sketch Hive UDFs</a></li>
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<li><a href="/docs/HLL/HllPerformance.html">•HLL Sketch Performance</a></li>
<li><a href="/docs/HLL/Hll_vs_CS_Hllpp.html">•HLL vs Clearspring HLL++</a></li>
<li><a href="/docs/HLL/HllSketchVsDruidHyperLogLogCollector.html">•HLL Sketch vs Druid HyperLogLogCollector</a></li>
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<p id="theta-sketches">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_theta_sketches">Theta Sketches</a>
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<li><a href="/docs/Theta/ThetaSketchFramework.html">•Theta Sketch Framework</a></li>
<p id="theta-examples">
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<li><a href="/docs/Theta/ConcurrentThetaSketch.html">•Concurrent Theta Sketch</a></li>
<li><a href="/docs/Theta/ThetaJavaExample.html">•Theta Sketch Java Example</a></li>
<li><a href="/docs/Theta/ThetaSparkExample.html">•Theta Sketch Spark Example</a></li>
<li><a href="/docs/Theta/ThetaPigUDFs.html">•Theta Sketch Pig UDFs</a></li>
<li><a href="/docs/Theta/ThetaHiveUDFs.html">•Theta Sketch Hive UDFs</a></li>
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<p id="kmv-tutorial">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_kmv_tutorial">KMV Tutorial</a>
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<li><a href="/docs/Theta/InverseEstimate.html">•The Inverse Estimate</a></li>
<li><a href="/docs/Theta/KMVempty.html">•Empty Sketch</a></li>
<li><a href="/docs/Theta/KMVfirstEst.html">•First Estimator</a></li>
<li><a href="/docs/Theta/KMVbetterEst.html">•Better Estimator</a></li>
<li><a href="/docs/Theta/KMVrejection.html">•Rejection Rules</a></li>
<li><a href="/docs/Theta/KMVupdateVkth.html">•Update V(kth) Rule</a></li>
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<p id="set-operations-and-p-sampling">
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<li><a href="/docs/Theta/ThetaSketchSetOps.html">•Set Operations</a></li>
<li><a href="/docs/Theta/ThetaSetOpsCornerCases.html">•Model & Test Set Operations</a></li>
<li><a href="/docs/Theta/ThetaPSampling.html">•<i>p</i>-Sampling</a></li>
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<p id="accuracy">
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<li><a href="/docs/Theta/ThetaAccuracy.html">•Basic Accuracy</a></li>
<li><a href="/docs/Theta/ThetaAccuracyPlots.html">•Accuracy Plots</a></li>
<li><a href="/docs/Theta/ThetaErrorTable.html">•Relative Error Table</a></li>
<li><a href="/docs/Theta/ThetaSketchSetOpsAccuracy.html">•SetOp Accuracy</a></li>
<li><a href="/docs/Theta/AccuracyOfDifferentKUnions.html">•Unions With Different k</a></li>
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<p id="size">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_size">Size</a>
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<li><a href="/docs/Theta/ThetaSize.html">•Theta Sketch Size</a></li>
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<p id="speed">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_speed">Speed</a>
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<li><a href="/docs/Theta/ThetaUpdateSpeed.html">•Update Speed</a></li>
<li><a href="/docs/Theta/ThetaMergeSpeed.html">•Merge Speed</a></li>
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<a data-toggle="collapse" class="menu collapsed" href="#collapse_theta_sketch_theory">Theta Sketch Theory</a>
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<li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/ThetaSketchFramework.pdf">•Theta Sketch Framework (PDF)</a></li>
<li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/ThetaSketchEquations.pdf">•Theta Sketch Equations (PDF)</a></li>
<li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/DataSketches.pdf">•DataSketches (PDF)</a></li>
<li><a href="/docs/Theta/ThetaConfidenceIntervals.html">•Confidence Intervals Notes</a></li>
<li><a href="/docs/Theta/ThetaMergingAlgorithm.html">•Merging Algorithm Notes</a></li>
<li><a href="/docs/Theta/ThetaReferences.html">•Theta References</a></li>
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<li><a href="/docs/Tuple/TupleEngagementExample.html">•Tuple Engagement Example</a></li>
<li><a href="/docs/Tuple/TuplePigUDFs.html">•Tuple Pig UDFs</a></li>
<li><a href="/docs/Tuple/TupleHiveUDFs.html">•Tuple Hive UDFs</a></li>
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<p id="most-frequent">
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<li><a href="/docs/Frequency/FrequencySketchesOverview.html">•Frequency Sketches Overview</a></li>
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<a data-toggle="collapse" class="menu collapsed" href="#collapse_frequent_item_sketches">Frequent Item Sketches</a>
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<li><a href="/docs/Frequency/FrequentItemsOverview.html">•Frequent Items Overview</a></li>
<li><a href="/docs/Frequency/FrequentItemsErrorTable.html">•Frequent Items Error Table</a></li>
<li><a href="/docs/Frequency/FrequentItemsReferences.html">•Frequent Items References</a></li>
<li><a href="/docs/Frequency/FrequentItemsPerformance.html">•Frequent Items Performance</a></li>
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<a data-toggle="collapse" class="menu collapsed" href="#collapse_most_frequent_examples">Most Frequent Examples</a>
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<li><a href="/docs/Frequency/FrequentItemsJavaExample.html">•Frequent Items Java Example</a></li>
<li><a href="/docs/Frequency/FrequentItemsCppExample.html">•Frequent Items C++ Example</a></li>
<li><a href="/docs/Frequency/FrequentItemsPigUDFs.html">•Frequent Items Pig UDFs</a></li>
<li><a href="/docs/Frequency/FrequentItemsHiveUDFs.html">•Frequent Items Hive UDFs</a></li>
</div>
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<p id="frequent-distinct-sketches">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_frequent_distinct_sketches">Frequent Distinct Sketches</a>
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<li><a href="/docs/Frequency/FrequentDistinctTuplesSketch.html">•Frequent Distinct Tuples Sketch</a></li>
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<a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_and_histograms">Quantiles And Histograms</a>
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<li><a href="/docs/Quantiles/SketchingQuantilesAndRanksTutorial.html">•Quantiles and Ranks Tutorial</a></li>
<li><a href="/docs/Quantiles/QuantilesOverview.html">•Quantiles Overview</a></li>
<li><a href="/docs/KLL/KLLSketch.html">•KLL Floats sketch</a></li>
<li><a href="/docs/KLL/KLLAccuracyAndSize.html">•KLL Sketch Accuracy and Size</a></li>
<li><a href="/docs/REQ/ReqSketch.html">•REQ Floats sketch</a></li>
<li><a href="/docs/Quantiles/OrigQuantilesSketch.html">•Original QuantilesSketch</a></li>
<p id="quantiles-examples">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_examples">Quantiles Examples</a>
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<li><a href="/docs/Quantiles/QuantilesJavaExample.html">•Quantiles Sketch Java Example</a></li>
<li><a href="/docs/KLL/KLLCppExample.html">•KLL Quantiles Sketch C++ Example</a></li>
<li><a href="/docs/Quantiles/QuantilesPigUDFs.html">•Quantiles Sketch Pig UDFs</a></li>
<li><a href="/docs/Quantiles/QuantilesHiveUDFs.html">•Quantiles Sketch Hive UDFs</a></li>
</div>
<p id="quantiles-studies">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_studies">Quantiles Studies</a>
</p>
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<li><a href="/docs/QuantilesStudies/DruidApproxHistogramStudy.html">•Druid Approximate Histogram</a></li>
<li><a href="/docs/QuantilesStudies/MomentsSketchStudy.html">•Moments Sketch Study</a></li>
<li><a href="/docs/QuantilesStudies/QuantilesStreamAStudy.html">•Quantiles StreamA Study</a></li>
<li><a href="/docs/QuantilesStudies/ExactQuantiles.html">•Exact Quantiles for Studies</a></li>
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<p id="quantiles-sketch-theory">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_sketch_theory">Quantiles Sketch Theory</a>
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<li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/Quantiles_KLL.pdf">•Optimal Quantile Approximation in Streams</a></li>
<li><a href="/docs/Quantiles/QuantilesReferences.html">•Quantiles References</a></li>
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<p id="sampling">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_sampling">Sampling</a>
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<li><a href="/docs/Sampling/ReservoirSampling.html">•Reservoir Sampling</a></li>
<li><a href="/docs/Sampling/ReservoirSamplingPerformance.html">•Reservoir Sampling Performance</a></li>
<li><a href="/docs/Sampling/VarOptSampling.html">•VarOpt Sampling</a></li>
<p id="sampling-examples">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_sampling_examples">Sampling Examples</a>
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<div class="collapse" id="collapse_sampling_examples">
<li><a href="/docs/Sampling/ReservoirSamplingJava.html">•Reservoir Sampling Java Example</a></li>
<li><a href="/docs/Sampling/ReservoirSamplingPigUDFs.html">•Reservoir Sampling Pig UDFs</a></li>
<li><a href="/docs/Sampling/VarOptSamplingJava.html">•VarOpt Sampling Java Example</a></li>
<li><a href="/docs/Sampling/VarOptPigUDFs.html">•VarOpt Sampling Pig UDFs</a></li>
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</div>
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<p id="system-integrations">
<a data-toggle="collapse" class="menu collapsed" href="#collapse_system_integrations">System Integrations</a>
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<li><a href="/docs/SystemIntegrations/ApacheDruidIntegration.html">•Using Sketches in ApacheDruid</a></li>
<li><a href="/docs/SystemIntegrations/ApacheHiveIntegration.html">•Using Sketches in Apache Hive</a></li>
<li><a href="/docs/SystemIntegrations/ApachePigIntegration.html">•Using Sketches in Apache Pig</a></li>
<li><a href="/docs/SystemIntegrations/PostgreSQLIntegration.html">•Using Sketches in PostgreSQL</a></li>
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<a data-toggle="collapse" class="menu collapsed" href="#collapse_community">Community</a>
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<li><a href="/docs/Community/index.html">•Community</a></li>
<li><a href="/docs/Community/Downloads.html">•Downloads</a></li>
<li><a href="/docs/Community/NewCommitterProcess.html">•Committer Process</a></li>
<li><a href="/docs/Community/ReleaseProcessForCppComponents.html">•Release Process For CPP Components</a></li>
<li><a href="/docs/Community/ReleaseProcessForJavaComponents.html">•Release Process For Java Components</a></li>
<li><a href="/docs/Community/Transitioning.html">•Transitioning from prior GitHub Site</a></li>
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<h1 id="downloads">Downloads</h1>
<h2 id="signing-keys"><a href="https://downloads.apache.org/datasketches/KEYS">Signing Keys</a></h2>
<p>It is essential that you verify the integrity of release downloads. See <a href="https://www.apache.org/dyn/closer.cgi#verify">instructions here.</a></p>
<h2 id="latest-source-zip-files">Latest Source Zip Files</h2>
<!-- Start _includes/downloadsInclude.txt. Computer generated, do not edit! -->
<table>
<thead>
<tr>
<th style="text-align: center">Component</th>
<th style="text-align: center">Release</th>
<th style="text-align: center">ZIP</th>
<th style="text-align: center">ASC</th>
<th style="text-align: center">SHA512</th>
<th style="text-align: center">Date-Time UTC</th>
<th style="text-align: center">SVN ID</th>
<th style="text-align: center">Committer</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: center">Java Core</td>
<td style="text-align: center">5.0.2</td>
<td style="text-align: center"><a href="https://www.apache.org/dyn/closer.lua/datasketches/java/5.0.2/apache-datasketches-java-5.0.2-src.zip">Download</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/java/5.0.2/apache-datasketches-java-5.0.2-src.zip.asc">Signature</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/java/5.0.2/apache-datasketches-java-5.0.2-src.zip.sha512">Hash</a></td>
<td style="text-align: center">2024-03-26T22:18:00Z</td>
<td style="text-align: center">68148</td>
<td style="text-align: center">jmalkin</td>
</tr>
<tr>
<td style="text-align: center">C++ Core</td>
<td style="text-align: center">5.0.2</td>
<td style="text-align: center"><a href="https://www.apache.org/dyn/closer.lua/datasketches/cpp/5.0.2/apache-datasketches-cpp-5.0.2-src.zip">Download</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/cpp/5.0.2/apache-datasketches-cpp-5.0.2-src.zip.asc">Signature</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/cpp/5.0.2/apache-datasketches-cpp-5.0.2-src.zip.sha512">Hash</a></td>
<td style="text-align: center">2024-01-13T07:14:37Z</td>
<td style="text-align: center">66583</td>
<td style="text-align: center">jmalkin</td>
</tr>
<tr>
<td style="text-align: center">Python Core</td>
<td style="text-align: center">5.0.1</td>
<td style="text-align: center"><a href="https://www.apache.org/dyn/closer.lua/datasketches/python/5.0.1/apache-datasketches-python-5.0.1-src.zip">Download</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/python/5.0.1/apache-datasketches-python-5.0.1-src.zip.asc">Signature</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/python/5.0.1/apache-datasketches-python-5.0.1-src.zip.sha512">Hash</a></td>
<td style="text-align: center">2024-02-13T08:45:46Z</td>
<td style="text-align: center">67318</td>
<td style="text-align: center">jmalkin</td>
</tr>
<tr>
<td style="text-align: center">Java Memory</td>
<td style="text-align: center">2.2.0</td>
<td style="text-align: center"><a href="https://www.apache.org/dyn/closer.lua/datasketches/memory/2.2.0/apache-datasketches-memory-2.2.0-src.zip">Download</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/memory/2.2.0/apache-datasketches-memory-2.2.0-src.zip.asc">Signature</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/memory/2.2.0/apache-datasketches-memory-2.2.0-src.zip.sha512">Hash</a></td>
<td style="text-align: center">2022-08-15T12:10:22Z</td>
<td style="text-align: center">56289</td>
<td style="text-align: center">dcromberge</td>
</tr>
<tr>
<td style="text-align: center">Java Hive Adaptor</td>
<td style="text-align: center">1.2.0</td>
<td style="text-align: center"><a href="https://www.apache.org/dyn/closer.lua/datasketches/hive/1.2.0/apache-datasketches-hive-1.2.0-src.zip">Download</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/hive/1.2.0/apache-datasketches-hive-1.2.0-src.zip.asc">Signature</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/hive/1.2.0/apache-datasketches-hive-1.2.0-src.zip.sha512">Hash</a></td>
<td style="text-align: center">2022-03-07T23:30:20Z</td>
<td style="text-align: center">52909</td>
<td style="text-align: center">alsay</td>
</tr>
<tr>
<td style="text-align: center">Java Pig Adaptor</td>
<td style="text-align: center">1.1.0</td>
<td style="text-align: center"><a href="https://www.apache.org/dyn/closer.lua/datasketches/pig/1.1.0/apache-datasketches-pig-1.1.0-src.zip">Download</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/pig/1.1.0/apache-datasketches-pig-1.1.0-src.zip.asc">Signature</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/pig/1.1.0/apache-datasketches-pig-1.1.0-src.zip.sha512">Hash</a></td>
<td style="text-align: center">2022-02-17T19:42:16Z</td>
<td style="text-align: center">52612</td>
<td style="text-align: center">alsay</td>
</tr>
<tr>
<td style="text-align: center">C++ PostgreSQL Adaptor</td>
<td style="text-align: center">1.7.0</td>
<td style="text-align: center"><a href="https://www.apache.org/dyn/closer.lua/datasketches/postgresql/1.7.0/apache-datasketches-postgresql-1.7.0-src.zip">Download</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/postgresql/1.7.0/apache-datasketches-postgresql-1.7.0-src.zip.asc">Signature</a></td>
<td style="text-align: center"><a href="https://downloads.apache.org/datasketches/postgresql/1.7.0/apache-datasketches-postgresql-1.7.0-src.zip.sha512">Hash</a></td>
<td style="text-align: center">2023-12-14T22:46:35Z</td>
<td style="text-align: center">66062</td>
<td style="text-align: center">alsay</td>
</tr>
</tbody>
</table>
<!-- End _includes/downloadsInclude.txt -->
<h2 id="download-java-jar-files">Download Java Jar Files</h2>
<p>From <a href="https://search.maven.org/search?q=g:%20org.apache.datasketches">Maven Central</a>.</p>
<h3 id="use-with-maven">Use with Maven</h3>
<p>If you are developing using Maven and want to use, for example, datasketches-java, add the following dependencies to your pom.xml file:</p>
<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>&lt;dependency&gt;
&lt;groupId&gt;org.apache.datasketches&lt;/groupId&gt;
&lt;artifactId&gt;datasketches-java&lt;/artifactId&gt;
&lt;version&gt;3.1.0&lt;/version&gt;
&lt;/dependency&gt;
</code></pre></div></div>
<h2 id="enabling-python">Enabling Python</h2>
<ul>
<li>First download the C++ core above, then read the <a href="https://github.com/apache/datasketches-cpp/tree/master/python">Python Installation Instructions</a></li>
</ul>
<h2 id="download-earlier-versions">Download Earlier Versions</h2>
<ul>
<li><a href="http://archive.apache.org/dist/datasketches">Recent ZIP Releases</a></li>
<li><a href="http://archive.apache.org/dist/incubator/datasketches">Older ZIP Releases</a></li>
<li><a href="https://search.maven.org/search?q=g:%20org.apache.datasketches">Maven Central for Java Jar files</a></li>
</ul>
<h2 id="version-numbers">Version Numbers</h2>
<p>Apache DataSketches uses <a href="https://semver.org/">semantic versioning</a>. Version numbers use the form major.minor.incremental and are updated as follows:</p>
<ul>
<li><strong>major version</strong> for major new functionality and/or major API changes. For major API changes users should expect that there may be some API-incompatible changes. This should be made clear in the release comments.</li>
<li><strong>minor version</strong> for new functionality and scheduled bug fixes. These should be API compatible with prior versions.</li>
<li><strong>incremental version</strong> for unscheduled bug fixes only.</li>
</ul>
<p>All download files include a version number in the name, as in <em>apache-datasketches-java-1.1.0-src.zip</em>.
This same number is also in the top section of the pom.xml file and is the same number in the GitHub Tag associated with the GitHub-ID that
the release was generated from.</p>
<h3 id="version-history-and-release-notes">Version History and Release Notes</h3>
<p>Please use GitHub version history on the respective component repositories. There are several ways to access the release notes:</p>
<h4 id="direct-link-from-the-github-page">Direct link from the GitHub page</h4>
<ul>
<li>In the right-hand column click on <strong>Releases</strong>.</li>
</ul>
<h4 id="from-the-tags-button-on-the-github-page">From the <strong>tags</strong> button on the GitHub page</h4>
<ul>
<li>Click on <strong>tags</strong></li>
<li>Select <strong>Releases</strong></li>
</ul>
<h4 id="from-the-branches-master-button">From the <strong>Branches (master)</strong> button</h4>
<ul>
<li>Click on the branch icon <strong>[master]</strong></li>
<li>Click on <strong>[Tags]</strong></li>
<li>At the bottom of the pop-up click on <strong>[View all tags]</strong></li>
<li>Click on <strong>[Releases]</strong></li>
</ul>
<h4 id="or-you-can-go-directly-by-apending-releases-to-the-url-as-in">Or, you can go directly by apending <code class="highlighter-rouge">/releases</code> to the URL as in</h4>
<ul>
<li><code class="highlighter-rouge">https://github.com/apache/datasketches-java/releases</code></li>
</ul>
<h2 id="release-philosophy">Release Philosophy</h2>
<p>These are fully tested, production quality releases, and hopefully as bug-free as humanly possible.
However, the code is continuously evolving and improvements in performance, documentation, additions
to the API, and bug fixes do occur. When enough of these build up, especially for bug fixes or
performance improvements, a new release will be issued and the <b>minor version</b>
digit will be incremented. The <b>incremental</b> digit will only be used for unscheduled bug fixes as stated above.</p>
<p>As stated above, the <b>major</b> digit is being reserved for major refactorings of the library where backward API
compatibility may not be guaranteed.</p>
<p>For the repositories that depend on java core, such as <i>datasketches-hive</i> and <i>datasketches-pig</i>,
the version number may be incremented just to be in sync with the java core repository,
and may not reflect any actual code changes other than a change in the pom.xml to reflect the new
dependency. Please refer to the release notes for that version.</p>
<h3 id="binary-compatibilty">Binary Compatibilty</h3>
<p>We try as much as possible to maintain <em>forward binary compatibility</em> of serialized (stored) sketch images. For example, a Java Theta Sketch stored as a binary image using version 0.1.0 (Aug, 2015) can be read and merged into a C++ Theta Union version 1.2.0 (Jan, 2020). The languages can be swapped in this scenario, but the versions cannot be.</p>
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