groupBitmapAnd

计算位图列的 AND ，返回 UInt64 类型的基数，如果添加后缀 State ，则返回 位图对象。

语法

  1. groupBitmapAnd(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

  1. DROP TABLE IF EXISTS bitmap_column_expr_test2;
  2. CREATE TABLE bitmap_column_expr_test2
  3. (
  4.     tag_id String,
  5.     z AggregateFunction(groupBitmap, UInt32)
  6. )
  7. ENGINE = MergeTree
  8. ORDER BY tag_id;
  10. INSERT INTO bitmap_column_expr_test2 VALUES ('tag1', bitmapBuild(cast([1,2,3,4,5,6,7,8,9,10] as Array(UInt32))));
  11. INSERT INTO bitmap_column_expr_test2 VALUES ('tag2', bitmapBuild(cast([6,7,8,9,10,11,12,13,14,15] as Array(UInt32))));
  12. INSERT INTO bitmap_column_expr_test2 VALUES ('tag3', bitmapBuild(cast([2,4,6,8,10,12] as Array(UInt32))));
  14. SELECT groupBitmapAnd(z) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
  15. ┌─groupBitmapAnd(z)─┐
  16. │               3   │
  17. └───────────────────┘
  19. SELECT arraySort(bitmapToArray(groupBitmapAndState(z))) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
  20. ┌─arraySort(bitmapToArray(groupBitmapAndState(z)))─┐
  21. │ [6,8,10]                                         │
  22. └──────────────────────────────────────────────────┘