groupBitmapAnd

Introducido en: v20.1.0 Calcula el AND de una columna bitmap y devuelve su cardinalidad. Si se añade el combinador de sufijo -State, devuelve un objeto bitmap. Sintaxis

groupBitmapAnd(expr)
groupBitmapAndState(expr)

Argumentos

expr — Expresión cuyo resultado es del tipo AggregateFunction(groupBitmap, UInt*). AggregateFunction(groupBitmap, UInt*)

Valor devuelto Devuelve un recuento de tipo UInt64 o un objeto bitmap cuando se utiliza -State. UInt64 Ejemplos Ejemplo de uso

Query

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%');

Response

┌─groupBitmapAnd(z)─┐
│               3   │
└───────────────────┘

Uso del combinador -State

Query

SELECT arraySort(bitmapToArray(groupBitmapAndState(z))) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');

Response

┌─arraySort(bitmapToArray(groupBitmapAndState(z)))─┐
│ [6,8,10]                                         │
└──────────────────────────────────────────────────┘

​groupBitmapAnd

groupBitmapAnd