ClickHouse/docs/zh/sql-reference/aggregate-functions/reference/groupbitmapor.md
2021-03-25 17:09:19 +08:00

49 lines
1.5 KiB
Markdown
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

---
toc_priority: 130
---
# groupBitmapOr {#groupbitmapor}
计算位图列的 `OR` ,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**
``` sql
groupBitmapOr(expr)
```
**参数**
`expr` 结果为 `AggregateFunction(groupBitmap, UInt*)` 类型的表达式。
**返回值**
`UInt64` 类型的值。
**示例**
``` 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 groupBitmapOr(z) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
┌─groupBitmapOr(z)─┐
│ 15 │
└──────────────────┘
SELECT arraySort(bitmapToArray(groupBitmapOrState(z))) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
┌─arraySort(bitmapToArray(groupBitmapOrState(z)))─┐
│ [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15] │
└─────────────────────────────────────────────────┘
```