[Feature] Use JDK9 Arrays.compare to check bytes prefix for PrefixLookup

[swuferhong]

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• I searched in the issues and found nothing similar.

Motivation

Currently, RocksDBKv#isPrefixEquals() very inefficient to compare arrays byte by byte. Java9 provides a more efficient way Arrays.compare(compare(byte[] a, int aFromIndex, int aToIndex, byte[] b, int bFromIndex, int bToIndex)), underlying it leverages SIMD instructions.

As it is only supported since Java9, we can implement it in a similar way like Crc32C. (the method can get the running JDK environment, if Java9 use the support Arrays.compare() method).

Note: Micro benchmarks is needed to compute the benefits of new Arrays.compare() on JDK9.

Solution

No response

Anything else?

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Willingness to contribute

• I'm willing to submit a PR!