数据仓库服务 GAUSSDB(DWS)-Roaring Bitmap聚合函数:rb_xor_cardinality_agg(roaringbitmap)

时间：2023-12-15 11:45:23

rb_xor_cardinality_agg(roaringbitmap)

描述：将分组内的roaringbitmap按照异或的逻辑合并后的基数。

示例：

SELECT a, rb_xor_cardinality_agg(b) FROM r1 GROUP BY a ORDER BY 1;
 a  | rb_xor_cardinality_agg
----+------------------------
 1  |                      0
 2  |                      1
 3  |                      1
 4  |                      1
 5  |                      1
 6  |                      1
 7  |                      1
 8  |                      1
 9  |                      1
 10 |                      1
(10 rows)