BITMAP_NOT
Descriptionβ
Computes the difference between the first Bitmap and the second Bitmap, and returns the result as a new Bitmap.
Syntaxβ
BITMAP_NOT(<bitmap1>, <bitmap2>)
Parametersβ
Parameter | Description |
---|---|
<bitmap1> | The first Bitmap |
<bitmap2> | The second Bitmap |
Return Valueβ
A Bitmap representing the elements in <bitmap1>
that are not in <bitmap2>
.
- If the parameter has a NULL value, it returns NULL
Examplesβ
To compute the difference between two Bitmaps:
select bitmap_to_string(bitmap_not(bitmap_from_string('2,3'), bitmap_from_string('1,2,3,4'))) as res;
The result will be an empty Bitmap, as all elements in <bitmap1>
are also in <bitmap2>
:
+------+
| res |
+------+
| |
+------+
To compute the difference where <bitmap1>
has elements not present in <bitmap2>
:
select bitmap_to_string(bitmap_not(bitmap_from_string('2,3,5'), bitmap_from_string('1,2,3,4'))) as res;
The result will be a Bitmap containing the element 5
:
+------+
| res |
+------+
| 5 |
+------+
select bitmap_to_string(bitmap_not(bitmap_from_string('2,3,5'), NULL)) as res;
+------+
| res |
+------+
| NULL |
+------+