[GitHub] [arrow-datafusion] Ted-Jiang commented on issue #1823: implement bitmap_distinct function using bitmap

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Ted-Jiang commented on issue #1823:
URL: 
https://github.com/apache/arrow-datafusion/issues/1823#issuecomment-1039896766


   Test result of use `roaring-rs` and `croaring-rs` (use same logic: insert 
one value one time)
   
   1million_rows_10thousand_distinct.parquet
   ```
   bitmap distinct 
   
   (roaring-rs)
   +---------------------------------+
   | BITMAPCOUNTDISTINCT(test.value) |
   +---------------------------------+
   | 10000                           |
   +---------------------------------+
   1 row in set. Query took 0.052 seconds
   
   （croaring-rs）
   +---------------------------------+
   | BITMAPCOUNTDISTINCT(test.value) |
   +---------------------------------+
   | 10000                           |
   +---------------------------------+
   1 row in set. Query took 0.038 seconds.
   
   ```
   
   1million_1million.parquet
   ```
   roaring-rs
   +---------------------------------+
   | BITMAPCOUNTDISTINCT(test.value) |
   +---------------------------------+
   | 631504                          |
   +---------------------------------+
   1 row in set. Query took 0.175 seconds(roaring-rs).
   
   croaring-rs
   +---------------------------------+
   | BITMAPCOUNTDISTINCT(test.value) |
   +---------------------------------+
   | 631504                          |
   +---------------------------------+
   1 row in set. Query took 0.052 seconds （croaring-rs）.
   ```


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