diff options
Diffstat (limited to 'src/include/access/gist.h')
| -rw-r--r-- | src/include/access/gist.h | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/src/include/access/gist.h b/src/include/access/gist.h index 52d3a2fe1a0..eab6a01bfd5 100644 --- a/src/include/access/gist.h +++ b/src/include/access/gist.h @@ -9,7 +9,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/gist.h,v 1.57 2007/01/05 22:19:50 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/gist.h,v 1.58 2007/04/09 22:04:05 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -56,26 +56,31 @@ /* * Page opaque data in a GiST index page. */ -#define F_LEAF (1 << 0) -#define F_DELETED (1 << 1) +#define F_LEAF (1 << 0) +#define F_DELETED (1 << 1) #define F_TUPLES_DELETED (1 << 2) typedef XLogRecPtr GistNSN; typedef struct GISTPageOpaqueData { - uint32 flags; /* 29 bits are unused for now */ - BlockNumber rightlink; - - /* - * the only meaning - change this value if page split. - */ - GistNSN nsn; + GistNSN nsn; /* this value must change on page split */ + BlockNumber rightlink; /* next page if any */ + uint16 flags; /* see bit definitions above */ + uint16 gist_page_id; /* for identification of GiST indexes */ } GISTPageOpaqueData; typedef GISTPageOpaqueData *GISTPageOpaque; /* + * 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 GIST_PAGE_ID 0xFF81 + +/* * This is the Split Vector to be returned by the PickSplit method. * PickSplit should check spl_(r|l)datum_exists. If it is 'true', * that corresponding spl_(r|l)datum already defined and |