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Bloom Filters are added to ORC indexes from Hive 1.2.0 onwards. |
The bloom filter indexes consist of a BLOOM_FILTER stream for each
column specified through 'orc.bloom.filter.columns' table properties.
A BLOOM_FILTER stream records a bloom filter entry for each row
group (default to 10,000 rows) in a column. Only the row groups that
qualify minsatisfy min/max row index evaluation will be evaluated against the
bloom filter index.
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