INTERSECT_COUNT

Description

Calculate the intersection of two or more bitmaps Usage: intersect_count(bitmap_column_to_count, filter_column, filter_values ...) Example: intersect_count(user_id, event, 'A', 'B', 'C'), meaning find the intersect count of user_id in all A/B/C 3 bitmaps Calculate the intersection count of elements in bitmap_column that match column_to_filter within filter_values, i.e., bitmap intersection count.

Syntax

INTERSECT_COUNT(<bitmap_column>, <column_to_filter>, <filter_values> [, ...])

Parameters

Parameter	Description
<bitmap_column>	The input bitmap parameter column. Supported types: Bitmap.
<column_to_filter>	The dimension column used for filtering. Supported types: TinyInt, SmallInt, Integer, BigInt, LargeInt.
<filter_values>	The different values used to filter the dimension column. Supported types: TinyInt, SmallInt, Integer, BigInt, LargeInt.

Return Value

Returns the number of elements in the intersection of the given bitmaps.

Example

-- setup
CREATE TABLE pv_bitmap (
	dt INT,
	user_id BITMAP,
	city STRING
) DISTRIBUTED BY HASH(dt) BUCKETS 1
PROPERTIES ("replication_num" = "1");
INSERT INTO pv_bitmap VALUES
	(20250801, to_bitmap(1), 'beijing'),
	(20250801, to_bitmap(2), 'beijing'),
	(20250801, to_bitmap(3), 'shanghai'),
	(20250802, to_bitmap(3), 'beijing'),
	(20250802, to_bitmap(4), 'shanghai'),
	(20250802, to_bitmap(5), 'shenzhen');

select intersect_count(user_id,dt,20250801) from pv_bitmap;

+--------------------------------------+
| intersect_count(user_id,dt,20250801) |
+--------------------------------------+
|                                    3 |
+--------------------------------------+