diff options
Diffstat (limited to 'src/include/nodes')
| -rw-r--r-- | src/include/nodes/relation.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index ac6dc764ce..f01877a9e8 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: relation.h,v 1.45 2000/02/18 23:47:17 tgl Exp $ + * $Id: relation.h,v 1.46 2000/03/22 22:08:29 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -252,6 +252,12 @@ typedef struct Path * as the inner path of a nestloop join. These paths have indexquals * that refer to values of other rels, so those other rels must be * included in the outer joinrel in order to make a usable join. + * + * 'rows' is the estimated result tuple count for the indexscan. This + * is the same as path.parent->rows for a simple indexscan, but it is + * different for a nestloop inner path, because the additional indexquals + * coming from join clauses make the scan more selective than the parent + * rel's restrict clauses alone would do. *---------- */ typedef struct IndexPath @@ -260,7 +266,8 @@ typedef struct IndexPath List *indexid; List *indexqual; ScanDirection indexscandir; - Relids joinrelids; /* other rels mentioned in indexqual */ + Relids joinrelids; /* other rels mentioned in indexqual */ + double rows; /* estimated number of result tuples */ } IndexPath; typedef struct TidPath |