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> Calculations the OR of a bitmap column, return cardinality of type UInt64, if add suffix -State, then return a bitmap object. This is equivalent to `groupBitmapMerge`.

# groupBitmapOr

<h2 id="groupBitmapOr">
  groupBitmapOr
</h2>

Introduced in: v20.1.0

Calculates the OR of a bitmap column and returns it's cardinality.
If suffix combinator [`-State`](/reference/functions/aggregate-functions/combinators#-state) is added, then it returns a bitmap object.
This is equivalent to `groupBitmapMerge` ([`groupBitmap`](/reference/functions/aggregate-functions/groupBitmap) with the [`-Merge`](/reference/functions/aggregate-functions/combinators#-merge) combinator suffix).

**Syntax**

```sql theme={null}
groupBitmapOr(expr)
groupBitmapOrState(expr)
```

**Arguments**

* `expr` — Expression that results in an `AggregateFunction(groupBitmap, UInt*)` type. [`AggregateFunction(groupBitmap, UInt*)`](/reference/data-types/aggregatefunction)

**Returned value**

Returns a count of type `UInt64`, or a bitmap object when using `-State`. [`UInt64`](/reference/data-types/int-uint)

**Examples**

**Usage example**

```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 groupBitmapOr(z) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
```

```response title=Response theme={null}
┌─groupBitmapOr(z)─┐
│             15   │
└──────────────────┘
```

**Using -State combinator**

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

```response title=Response theme={null}
┌─arraySort(bitmapToArray(groupBitmapOrState(z)))─┐
│ [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]           │
└─────────────────────────────────────────────────┘
```