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[SPARK-12934][SQL] Count-min sketch serialization
This PR adds serialization support for `CountMinSketch`. A version number is added to version the serialized binary format. Author: Cheng Lian <lian@databricks.com> Closes #10893 from liancheng/cms-serialization.
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- common/sketch/src/main/java/org/apache/spark/util/sketch/CountMinSketch.java 28 additions, 4 deletions...ain/java/org/apache/spark/util/sketch/CountMinSketch.java
- common/sketch/src/main/java/org/apache/spark/util/sketch/CountMinSketchImpl.java 116 additions, 13 deletions...java/org/apache/spark/util/sketch/CountMinSketchImpl.java
- common/sketch/src/main/java/org/apache/spark/util/sketch/IncompatibleMergeException.java 24 additions, 0 deletions.../apache/spark/util/sketch/IncompatibleMergeException.java
- common/sketch/src/test/scala/org/apache/spark/util/sketch/CountMinSketchSuite.scala 45 additions, 2 deletions...la/org/apache/spark/util/sketch/CountMinSketchSuite.scala
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