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https://issues.apache.org/jira/browse/PARQUET-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mars updated PARQUET-2237:
--------------------------
Description:
Bloomfilter needs to load from filesystem, it may costs time and memory. If we
can exactly determine the existence/nonexistence of the value from other
filters , then we can avoid using Bloomfilter to Improve performance.
Similarly, if we can accurately judge by the minMax status, we also don’t need
to load the dictionary from filesystem and compare one by one anymore.
For example,
# read data greater than {{x1}} in the block, if minMax in status is all
greater than {{{}x1{}}}, then we don't need to read dictionary and compare one
by one.
# If we already have page dictionaries and compare one by one already, we
don't need to read BloomFilter and compare.
was:
Bloomfilter needs to load from filesystem, it may costs time and space. If we
can exactly determine the existence/nonexistence of the value from other
filters , then we can avoid using Bloomfilter to Improve performance.
When the minMax values in StatisticsFilter is same, we can exactly determine
the existence/nonexistence of the value.
When we have page dictionaries, we can also determine the
existence/nonexistence of the value.
> Improve performance when filters in RowGroupFilter can match exactly
> --------------------------------------------------------------------
>
> Key: PARQUET-2237
> URL: https://issues.apache.org/jira/browse/PARQUET-2237
> Project: Parquet
> Issue Type: Improvement
> Reporter: Mars
> Priority: Major
>
> Bloomfilter needs to load from filesystem, it may costs time and memory. If
> we can exactly determine the existence/nonexistence of the value from other
> filters , then we can avoid using Bloomfilter to Improve performance.
> Similarly, if we can accurately judge by the minMax status, we also don’t
> need to load the dictionary from filesystem and compare one by one anymore.
> For example,
> # read data greater than {{x1}} in the block, if minMax in status is all
> greater than {{{}x1{}}}, then we don't need to read dictionary and compare
> one by one.
> # If we already have page dictionaries and compare one by one already, we
> don't need to read BloomFilter and compare.
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