bitmap_and_not,bitmap_andnot

description

Syntax

BITMAP BITMAP_AND_NOT(BITMAP lhs, BITMAP rhs)

Calculate the set after lhs minus intersection of two input bitmaps, return the new bitmap.

example

  1. mysql> select bitmap_count(bitmap_and_not(bitmap_from_string('1,2,3'),bitmap_from_string('3,4,5'))) cnt;
  2. +------+
  3. | cnt  |
  4. +------+
  5. |    2 |
  6. +------+
  8. mysql> select bitmap_to_string(bitmap_and_not(bitmap_from_string('1,2,3'),bitmap_from_string('3,4,5')));
  9. +--------------------------------------------------------------------------------------------+
  10. | bitmap_to_string(bitmap_and_not(bitmap_from_string('1,2,3'), bitmap_from_string('3,4,5'))) |
  11. +--------------------------------------------------------------------------------------------+
  12. | 1,2                                                                                        |
  13. +--------------------------------------------------------------------------------------------+
  15. mysql> select bitmap_to_string(bitmap_and_not(bitmap_from_string('1,2,3'),bitmap_empty())) ;
  16. +-------------------------------------------------------------------------------+
  17. | bitmap_to_string(bitmap_and_not(bitmap_from_string('1,2,3'), bitmap_empty())) |
  18. +-------------------------------------------------------------------------------+
  19. | 1,2,3                                                                         |
  20. +-------------------------------------------------------------------------------+
  22. mysql> select bitmap_to_string(bitmap_and_not(bitmap_from_string('1,2,3'),NULL));
  23. +---------------------------------------------------------------------+
  24. | bitmap_to_string(bitmap_and_not(bitmap_from_string('1,2,3'), NULL)) |
  25. +---------------------------------------------------------------------+
  26. | NULL                                                                |
  27. +---------------------------------------------------------------------+

keywords

  1. BITMAP_AND_NOT,BITMAP_ANDNOT,BITMAP