[GitHub] [incubator-doris] wangbo opened a new issue #3088: Support Java version 64 bits Integers for BITMAP type

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wangbo opened a new issue #3088: Support Java version 64 bits Integers for BITMAP type
URL: https://github.com/apache/incubator-doris/issues/3088
 
 
   **Why We Need a Java version 64 int bitmap**
   In the new Spark Load process,we want to support  pre-aggregation of  precise count distinct,that means we need to build bitmap in the Spark Load;
   But now 64 bits Integers RoaringBitmap doesn't support serialize and deserialize cross Java Version and C++ version,because they have different storage format.
   #2771 has fork and define a Doris owned bitmap format,but just C++ version.
   So we need a Java version that is compatible with it.
   
   **Solution**
   Fork a Roaring64NavigableMap;
   Rewrite its serialize/deserialize;

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