ClickHouse/docs/zh/sql-reference/aggregate-functions/reference/groupbitmapand.md

49 lines
1.5 KiB
Markdown
Raw Normal View History

2021-02-02 12:00:41 +00:00
---
toc_priority: 129
---
# groupBitmapAnd {#groupbitmapand}
2021-02-05 15:50:14 +00:00
计算位图列的 `AND` ,返回 `UInt64` 类型的基数,如果添加后缀 `State` ,则返回 [位图对象](../../../sql-reference/functions/bitmap-functions.md)。
**语法**
2021-02-02 12:00:41 +00:00
``` sql
groupBitmapAnd(expr)
```
2021-02-05 15:50:14 +00:00
**参数**
2021-02-02 12:00:41 +00:00
2021-02-05 15:50:14 +00:00
`expr` 结果为 `AggregateFunction(groupBitmap, UInt*)` 类型的表达式。
2021-02-02 12:00:41 +00:00
2021-02-05 15:50:14 +00:00
**返回值**
2021-02-02 12:00:41 +00:00
2021-02-05 15:50:14 +00:00
`UInt64` 类型的值。
2021-02-02 12:00:41 +00:00
2021-02-05 15:50:14 +00:00
**示例**
2021-02-02 12:00:41 +00:00
``` sql
DROP TABLE IF EXISTS bitmap_column_expr_test2;
CREATE TABLE bitmap_column_expr_test2
(
tag_id String,
z AggregateFunction(groupBitmap, UInt32)
)
ENGINE = MergeTree
ORDER BY tag_id;
INSERT INTO bitmap_column_expr_test2 VALUES ('tag1', bitmapBuild(cast([1,2,3,4,5,6,7,8,9,10] as Array(UInt32))));
INSERT INTO bitmap_column_expr_test2 VALUES ('tag2', bitmapBuild(cast([6,7,8,9,10,11,12,13,14,15] as Array(UInt32))));
INSERT INTO bitmap_column_expr_test2 VALUES ('tag3', bitmapBuild(cast([2,4,6,8,10,12] as Array(UInt32))));
SELECT groupBitmapAnd(z) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
┌─groupBitmapAnd(z)─┐
│ 3 │
└───────────────────┘
SELECT arraySort(bitmapToArray(groupBitmapAndState(z))) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
┌─arraySort(bitmapToArray(groupBitmapAndState(z)))─┐
│ [6,8,10] │
└──────────────────────────────────────────────────┘
```