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 4f770b7ca1..8392ab505b 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: relation.h,v 1.80 2003/05/28 16:04:02 tgl Exp $ + * $Id: relation.h,v 1.81 2003/06/15 22:51:45 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -340,6 +340,15 @@ typedef struct Path * Also note that indexquals lists do not contain RestrictInfo nodes, * just bare clause expressions. * + * 'indexjoinclauses' is NIL for an ordinary indexpath (one that does not + * use any join clauses in the index conditions). For an innerjoin indexpath, + * it has the same structure as 'indexqual', but references the RestrictInfo + * nodes from which the indexqual was built, rather than the bare clause + * expressions. (Note: there isn't necessarily a one-to-one correspondence + * between RestrictInfos and expressions, because of expansion of special + * indexable operators.) We need this so that we can eliminate redundant + * join clauses when plans are built. + * * 'indexscandir' is one of: * ForwardScanDirection: forward scan of an ordered index * BackwardScanDirection: backward scan of an ordered index @@ -360,6 +369,7 @@ typedef struct IndexPath Path path; List *indexinfo; List *indexqual; + List *indexjoinclauses; ScanDirection indexscandir; double rows; /* estimated number of result tuples */ } IndexPath; |