diff options
| author | Tom Lane | 2002-03-01 06:01:20 +0000 |
|---|---|---|
| committer | Tom Lane | 2002-03-01 06:01:20 +0000 |
| commit | 8f0a9e85b31e67a64604c19a061e91ad1c92b041 (patch) | |
| tree | d771f40b07f2f0f19401e6a0cc73adf436d26bb3 /src/include | |
| parent | f8c109528cc6e7a6230b86e75374e0210db2ba56 (diff) | |
Second thoughts dept: arrange to cache mergejoin scan selectivity
in RestrictInfo nodes, instead of recomputing on every use.
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/nodes/relation.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index c301d39b2a1..e14f1ea4e83 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: relation.h,v 1.61 2001/11/05 17:46:34 momjian Exp $ + * $Id: relation.h,v 1.62 2002/03/01 06:01:20 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -521,6 +521,10 @@ typedef struct RestrictInfo List *left_pathkey; /* canonical pathkey for left side */ List *right_pathkey; /* canonical pathkey for right side */ + /* cache space for mergeclause processing; -1 if not yet set */ + Selectivity left_mergescansel; /* fraction of left side to scan */ + Selectivity right_mergescansel; /* fraction of right side to scan */ + /* valid if clause is hashjoinable, else InvalidOid: */ Oid hashjoinoperator; /* copy of clause operator */ |