其他
PgSQL技术内幕-Bitmap Index Scan
1、简介
2、Bitmap Index Scan中的Bitmap是什么
typedef enum
{
TBM_EMPTY, /* no hashtable, nentries == 0 */
TBM_ONE_PAGE, /* entry1 contains the single entry */
TBM_HASH /* pagetable is valid, entry1 is not */
} TBMStatus;