BITMAP BITMAP_COUNT(BITMAP lhs)
Returns the number of input bitmaps.
mysql> select bitmap_count(to_bitmap(1)) cnt; +------+ | cnt | +------+ | 1 | +------+ mysql> select bitmap_count(bitmap_and(to_bitmap(1), to_bitmap(1))) cnt; +------+ | cnt | +------+ | 1 | +------+
BITMAP_COUNT