diff options
Diffstat (limited to 'src/include/access/nbtree.h')
| -rw-r--r-- | src/include/access/nbtree.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/include/access/nbtree.h b/src/include/access/nbtree.h index a3583f225be..83e0e6c28e0 100644 --- a/src/include/access/nbtree.h +++ b/src/include/access/nbtree.h @@ -97,12 +97,12 @@ typedef BTPageOpaqueData *BTPageOpaque; typedef struct BTMetaPageData { uint32 btm_magic; /* should contain BTREE_MAGIC */ - uint32 btm_version; /* should contain BTREE_VERSION */ + uint32 btm_version; /* nbtree version (always <= BTREE_VERSION) */ BlockNumber btm_root; /* current root location */ uint32 btm_level; /* tree level of the root page */ BlockNumber btm_fastroot; /* current "fast" root location */ uint32 btm_fastlevel; /* tree level of the "fast" root page */ - /* following fields are available since page version 3 */ + /* remaining fields only valid when btm_version >= BTREE_NOVAC_VERSION */ TransactionId btm_oldest_btpo_xact; /* oldest btpo_xact among all deleted * pages */ float8 btm_last_cleanup_num_heap_tuples; /* number of heap tuples |