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49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
---
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toc_priority: 131
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---
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# groupBitmapXor {#groupbitmapxor}
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计算位图列的 `XOR` ，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)。
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**语法**
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``` sql
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groupBitmapXor(expr)
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```
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**参数**
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`expr` – 结果为 `AggregateFunction(groupBitmap, UInt*)` 类型的表达式。
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**返回值**
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`UInt64` 类型的值。
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**示例**
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``` sql
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DROP TABLE IF EXISTS bitmap_column_expr_test2;
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CREATE TABLE bitmap_column_expr_test2
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(
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tag_id String,
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z AggregateFunction(groupBitmap, UInt32)
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)
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ENGINE = MergeTree
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ORDER BY tag_id;
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INSERT INTO bitmap_column_expr_test2 VALUES ('tag1', bitmapBuild(cast([1,2,3,4,5,6,7,8,9,10] as Array(UInt32))));
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INSERT INTO bitmap_column_expr_test2 VALUES ('tag2', bitmapBuild(cast([6,7,8,9,10,11,12,13,14,15] as Array(UInt32))));
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INSERT INTO bitmap_column_expr_test2 VALUES ('tag3', bitmapBuild(cast([2,4,6,8,10,12] as Array(UInt32))));
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SELECT groupBitmapXor(z) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
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┌─groupBitmapXor(z)─┐
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│ 10 │
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└───────────────────┘
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SELECT arraySort(bitmapToArray(groupBitmapXorState(z))) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
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┌─arraySort(bitmapToArray(groupBitmapXorState(z)))─┐
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│ [1,3,5,6,8,10,11,13,14,15] │
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└──────────────────────────────────────────────────┘
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```
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