diff options
Diffstat (limited to 'src/include/utils/rel.h')
| -rw-r--r-- | src/include/utils/rel.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h index 7d3cbf7bf0..015d7ddc9e 100644 --- a/src/include/utils/rel.h +++ b/src/include/utils/rel.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.88 2006/03/05 15:59:07 momjian Exp $ + * $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.89 2006/04/25 22:46:05 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -167,6 +167,13 @@ typedef struct RelationData * cached, namely those with subtype zero. The arrays are indexed by * strategy or support number, which is a sufficient identifier given that * restriction. + * + * Note: rd_amcache is available for index AMs to cache private data about + * an index. This must be just a cache since it may get reset at any time + * (in particular, it will get reset by a relcache inval message for the + * index). If used, it must point to a single memory chunk palloc'd in + * rd_indexcxt. A relcache reset will include freeing that chunk and + * setting rd_amcache = NULL. */ MemoryContext rd_indexcxt; /* private memory cxt for this stuff */ RelationAmInfo *rd_aminfo; /* lookup info for funcs found in pg_am */ @@ -175,6 +182,7 @@ typedef struct RelationData FmgrInfo *rd_supportinfo; /* lookup info for support procedures */ List *rd_indexprs; /* index expression trees, if any */ List *rd_indpred; /* index predicate tree, if any */ + void *rd_amcache; /* available for use by index AM */ /* statistics collection area */ PgStat_Info pgstat_info; |