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https://issues.apache.org/jira/browse/PARQUET-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mars updated PARQUET-2254:
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Description:
Now the usage is to specify the size, and then build BloomFilter. In general
scenarios, it is actually not sure how much the distinct value is.
If BloomFilter can be automatically generated according to the data, the file
size can be reduced and the reading efficiency can also be improved.
I have an idea that the user can specify a maximum BloomFilter filter size,
then we build several BloomFilter at the same time, we can use the largest
BloomFilter as a counting tool( If there is no hit when inserting a value, the
counter will be +1, of course this may be imprecise but enough)
Then at the end of the write, choose a BloomFilter of a more appropriate size
when the file is finally written.
I want to implement this feature and hope to get your opinions, thank you
was:
Now the usage is to specify the size, and then build BloomFilter. In general
scenarios, it is actually not sure how much the distinct value is.
If BloomFilter can be automatically generated according to the data, the file
size can be reduced and the reading efficiency can also be improved.
I have an idea that the user can specify a maximum BloomFilter filter size,
then we build several BloomFilter at the same time, we can use the largest
BloomFilter as a counting tool( If there is no hit when inserting a value, the
counter will be +1, of course this may be imprecise but enough)
Then at the end of the write, choose a BloomFilter of a more appropriate size
when the file is finally written.
> Build a BloomFilter with a more precise size
> --------------------------------------------
>
> Key: PARQUET-2254
> URL: https://issues.apache.org/jira/browse/PARQUET-2254
> Project: Parquet
> Issue Type: Improvement
> Reporter: Mars
> Priority: Major
>
> Now the usage is to specify the size, and then build BloomFilter. In general
> scenarios, it is actually not sure how much the distinct value is.
> If BloomFilter can be automatically generated according to the data, the file
> size can be reduced and the reading efficiency can also be improved.
> I have an idea that the user can specify a maximum BloomFilter filter size,
> then we build several BloomFilter at the same time, we can use the largest
> BloomFilter as a counting tool( If there is no hit when inserting a value,
> the counter will be +1, of course this may be imprecise but enough)
> Then at the end of the write, choose a BloomFilter of a more appropriate size
> when the file is finally written.
> I want to implement this feature and hope to get your opinions, thank you
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