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> 计算 bitmap 列的 异或，并返回 UInt64 类型的基数；如果使用 -State 后缀，则返回 bitmap 对象

# groupBitmapXor

<div id="groupBitmapXor">
  ## groupBitmapXor
</div>

引入版本：v20.1.0

计算 bitmap 列的异或，并返回其基数。
如果添加后缀组合器 [`-State`](/zh/reference/functions/aggregate-functions/combinators#-state)，则返回一个 bitmap 对象。

**语法**

```sql theme={null}
groupBitmapXor(expr)
groupBitmapXorState(expr)
```

**参数**

* `expr` — 结果类型为 `AggregateFunction(groupBitmap, UInt*)` 的表达式。[`AggregateFunction(groupBitmap, UInt*)`](/zh/reference/data-types/aggregatefunction)

**返回值**

返回 `UInt64` 类型的计数；使用 `-State` 时，返回 bitmap 对象。[`UInt64`](/zh/reference/data-types/int-uint)

**示例**

**用法示例**

```sql title=Query theme={null}
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 groupBitmapXor(z) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
```

```response title=Response theme={null}
┌─groupBitmapXor(z)─┐
│              10   │
└───────────────────┘
```

**使用 -State 组合器**

```sql title=Query theme={null}
SELECT arraySort(bitmapToArray(groupBitmapXorState(z))) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
```

```response title=Response theme={null}
┌─arraySort(bitmapToArray(groupBitmapXorState(z)))─┐
│ [1, 3, 5, 6, 8, 10, 11, 13, 14, 15]              │
└──────────────────────────────────────────────────┘
```