Github user wgtmac commented on the issue:
https://github.com/apache/orc/pull/301
@majetideepak There is a PR https://github.com/apache/orc/pull/268 from
@xndai to support Java reader to decompress ZSTD. It uses aircompressor which
has the java implementation of zstd decompressor while zstd compressor is not
released yet. Combining that PR with this, we can confirm end-to-end
functionality and consistency. Though hadoop 2.9.1 has added ZStandardCodec for
both compressor and decompressor, we don't have enough incentive to leverage it
because of its JNI implementation.
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