diff options
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index 6b205b20da5..0d129f38ea1 100644 --- a/src/include/nodes/relation.h +++ b/src/include/nodes/relation.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.87 2003/12/28 21:57:37 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.88 2003/12/30 23:53:15 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -596,6 +596,19 @@ typedef struct RestrictInfo bool ispusheddown; /* TRUE if clause was pushed down in level */ + /* + * This flag is set true if the clause looks potentially useful as a + * merge or hash join clause, that is if it is a binary opclause with + * nonoverlapping sets of relids referenced in the left and right sides. + * (Whether the operator is actually merge or hash joinable isn't + * checked, however.) + */ + bool canjoin; + + /* These fields are set for any binary opclause: */ + Relids left_relids; /* relids in left side of clause */ + Relids right_relids; /* relids in right side of clause */ + /* only used if clause is an OR clause: */ List *subclauseindices; /* indexes matching subclauses */ /* subclauseindices is a List of Lists of IndexOptInfos */ @@ -604,15 +617,6 @@ typedef struct RestrictInfo QualCost eval_cost; /* eval cost of clause; -1 if not yet set */ Selectivity this_selec; /* selectivity; -1 if not yet set */ - /* - * If the clause looks useful for joining --- that is, it is a binary - * opclause with nonoverlapping sets of relids referenced in the left - * and right sides --- then these two fields are set to sets of the - * referenced relids. Otherwise they are both NULL. - */ - Relids left_relids; /* relids in left side of join clause */ - Relids right_relids; /* relids in right side of join clause */ - /* valid if clause is mergejoinable, else InvalidOid: */ Oid mergejoinoperator; /* copy of clause operator */ Oid left_sortop; /* leftside sortop needed for mergejoin */ |