diff options
Diffstat (limited to 'src/include/access/hash.h')
| -rw-r--r-- | src/include/access/hash.h | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/src/include/access/hash.h b/src/include/access/hash.h index 7ba8fbfc2f..114a684dbc 100644 --- a/src/include/access/hash.h +++ b/src/include/access/hash.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.77 2007/04/02 03:49:40 tgl Exp $ + * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.78 2007/04/09 22:04:05 tgl Exp $ * * NOTES * modeled after Margo Seltzer's hash implementation for unix. @@ -56,20 +56,18 @@ typedef struct HashPageOpaqueData BlockNumber hasho_nextblkno; /* next ovfl blkno */ Bucket hasho_bucket; /* bucket number this pg belongs to */ uint16 hasho_flag; /* page type code, see above */ - uint16 hasho_filler; /* available for future use */ - - /* - * We presently set hasho_filler to HASHO_FILL (0x1234); this is for the - * convenience of pg_filedump, which otherwise would have a hard time - * telling HashPageOpaqueData from BTPageOpaqueData. If we ever need that - * space for some other purpose, pg_filedump will have to find another - * way. - */ + uint16 hasho_page_id; /* for identification of hash indexes */ } HashPageOpaqueData; typedef HashPageOpaqueData *HashPageOpaque; -#define HASHO_FILL 0x1234 +/* + * The page ID is for the convenience of pg_filedump and similar utilities, + * which otherwise would have a hard time telling pages of different index + * types apart. It should be the last 2 bytes on the page. This is more or + * less "free" due to alignment considerations. + */ +#define HASHO_PAGE_ID 0xFF80 /* * HashScanOpaqueData is private state for a hash index scan. |