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https://issues.apache.org/jira/browse/HIVE-28528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17907801#comment-17907801
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Ayush Saxena commented on HIVE-28528:
-------------------------------------
I don't mind having one, if we already have the dependency and there is no
other way we can achieve these functionality.
If nobody objects feel free to open a PR
> Support Bitmap function
> -----------------------
>
> Key: HIVE-28528
> URL: https://issues.apache.org/jira/browse/HIVE-28528
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Affects Versions: 4.0.0
> Reporter: yongzhi.shao
> Priority: Minor
>
> Since we have introduced roaringbitmap dependency in hive-ql module.
> Can we take this opportunity to introduce bitmap related UDFs, which can be
> used to quickly compute intersection and merger differences, de-duplication
> statistics, and other computational needs.
> If so, I can do this.
>
> DEMO:
> {code:java}
> CREATE TABLE IF NOT EXISTS `hive_bitmap_table`
> (
> k int,
> uuid bigint,
> bitmap binary
> ) comment
> STORED AS ORC;
> --demo
> select count(distinct uuid) from hive_bitmap_table;
> select bitmap_count(to_bitmap(uuid)) from hive_bitmap_table;
> insert into table hive_bitmap_table select 2 as id,2 as uuid,to_bitmap(2) as
> bitmap;{code}
>
>
>
> |UDF|desc |demo |result|
> |to_bitmap|Convert number (int or bigint) to bitmap|to_bitmap(num)|bitmap
> (binary)|
> |bitmap_union|Multiple bitmaps merged into one bitmap
> (concatenation)|bitmap_union(bitmap)|bitmap|
> |bitmap_count|Calculate the number of elements stored in the
> bitmap|bitmap_count(bitmap)|long|
> |bitmap_and|Calculate the intersection of two
> bitmaps|bitmap_and(bitmap1,bitmap2)|bitmap|
> |bitmap_or|Calculate the concatenation of two
> bitmaps|bitmap_or(bitmap1,bitmap2)|bitmap|
> |bitmap_xor|Calculate the difference between two
> bitmaps|bitmap_xor(bitmap1,bitmap2)|bitmap|
> |bitmap_from_array|Converting an array to a
> bitmap|bitmap_from_array(array)|bitmap|
> |bitmap_to_array|Convert bitmap to
> array|bitmap_to_array(bitmap)|array<bigint>|
> |bitmap_contains|Determine if a bitmap contains all the elements of another
> bitmap.|bitmap_contains(bitmap1,bitmap2)|boolean|
> |bitmap_contains|Determine if a bitmap contains an
> element|bitmap_contains(bitmap,num)|boolean|
>
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