Github user xerial commented on the pull request:
https://github.com/apache/spark/pull/12074#issuecomment-203687378
A reason snappy-java's SnappyInputStream uses Snappy.arrayCopy (JNI method)
is to load the uncompressed data into primitive type arrays (e.g., float[],
int[]) since there is no standard Java method for doing this.
When writing data to byte[], replacing the implementation with non-JNI
based one (using System.arrayCopy) is possible.
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