The documentation is not clear about how to use the merge operation while using rocksdb-jni, and I am not familiar with C++ API, how could I define an merge operator?
How to use Rocksdb merge in Java？
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You can't define new merge operators in java. They need to be implemented in C++ and then compiled and brought in Java
Eg how to use the built in uint64add operator
val options = Options().setMergeOperator(UInt64AddOperator())and then you can use
rocksDB.merge(keyByteArray, longValueByteArray)