Github user omalley commented on the issue:
https://github.com/apache/orc/pull/60
Ok, the latest push has a few changes:
* bloom_filter_utf8 streams use a new encoding with bytes instead of
long[]. This is much more efficient for performance and storage size.
* all column types now have bloom_filter_utf8 streams (largely to get the
new representation)
* the default is to just write the new bloom_filter_utf8 streams that old
readers will ignore. There is an option to write both bloom_filter and
bloom_filter_utf8 streams to support old readers.
* there is an option for new readers to ignore the old bloom filters.
* files generated after hive-12055 will correctly use the utf8 encoding
even for the bloom_filter stream.
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