diff options
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index 93dc78aece4..7c702f7105a 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.111 2005/06/06 04:13:36 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.112 2005/06/08 23:02:05 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -72,7 +72,17 @@ typedef struct PlannerInfo struct RelOptInfo **base_rel_array; /* All one-relation RelOptInfos */ int base_rel_array_size; /* current allocated array len */ + /* + * join_rel_list is a list of all join-relation RelOptInfos we have + * considered in this planning run. For small problems we just scan + * the list to do lookups, but when there are many join relations we + * build a hash table for faster lookups. The hash table is present + * and valid when join_rel_hash is not NULL. Note that we still maintain + * the list even when using the hash table for lookups; this simplifies + * life for GEQO. + */ List *join_rel_list; /* list of join-relation RelOptInfos */ + struct HTAB *join_rel_hash; /* optional hashtable for join relations */ List *equi_key_list; /* list of lists of equijoined * PathKeyItems */ |