diff options
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index 4e285a765ad..f7900377398 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.131 2007/01/09 02:14:15 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.132 2007/01/10 18:06:04 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -618,9 +618,11 @@ typedef JoinPath NestPath; * A mergejoin path has these fields. * * path_mergeclauses lists the clauses (in the form of RestrictInfos) - * that will be used in the merge. The parallel lists path_mergefamilies - * and path_mergestrategies specify the merge semantics for each clause - * (in effect, defining the relevant sort ordering for each clause). + * that will be used in the merge. The parallel arrays path_mergeFamilies, + * path_mergeStrategies, and path_mergeNullsFirst specify the merge semantics + * for each clause (i.e., define the relevant sort ordering for each clause). + * (XXX is this the most reasonable path-time representation? It's at least + * partially redundant with the pathkeys of the input paths.) * * Note that the mergeclauses are a subset of the parent relation's * restriction-clause list. Any join clauses that are not mergejoinable @@ -637,8 +639,10 @@ typedef struct MergePath { JoinPath jpath; List *path_mergeclauses; /* join clauses to be used for merge */ - List *path_mergefamilies; /* OID list of btree opfamilies */ - List *path_mergestrategies; /* integer list of btree strategies */ + /* these are arrays, but have the same length as the mergeclauses list: */ + Oid *path_mergeFamilies; /* per-clause OIDs of opfamilies */ + int *path_mergeStrategies; /* per-clause ordering (ASC or DESC) */ + bool *path_mergeNullsFirst; /* per-clause nulls ordering */ List *outersortkeys; /* keys for explicit sort, if any */ List *innersortkeys; /* keys for explicit sort, if any */ } MergePath; @@ -885,6 +889,9 @@ typedef struct OuterJoinInfo * the order of joining and use special join methods at some join points. * We record information about each such IN clause in an InClauseInfo struct. * These structs are kept in the PlannerInfo node's in_info_list. + * + * Note: sub_targetlist is just a list of Vars or expressions; it does not + * contain TargetEntry nodes. */ typedef struct InClauseInfo @@ -893,11 +900,7 @@ typedef struct InClauseInfo Relids lefthand; /* base relids in lefthand expressions */ Relids righthand; /* base relids coming from the subselect */ List *sub_targetlist; /* targetlist of original RHS subquery */ - - /* - * Note: sub_targetlist is just a list of Vars or expressions; it does not - * contain TargetEntry nodes. - */ + List *in_operators; /* OIDs of the IN's equality operator(s) */ } InClauseInfo; /* |