diff options
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 33 |
1 files changed, 21 insertions, 12 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index 010adcc859..14486591da 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 1.90 2004/01/04 03:51:52 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.91 2004/01/05 05:07:36 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -321,6 +321,8 @@ typedef struct Path { NodeTag type; + NodeTag pathtype; /* tag identifying scan/join method */ + RelOptInfo *parent; /* the relation this path can build */ /* estimated execution costs for path (see costsize.c for more info) */ @@ -329,8 +331,6 @@ typedef struct Path Cost total_cost; /* total cost (assuming all tuples * fetched) */ - NodeTag pathtype; /* tag identifying scan/join method */ - List *pathkeys; /* sort ordering of path's output */ /* pathkeys is a List of Lists of PathKeyItem nodes; see above */ } Path; @@ -389,6 +389,9 @@ typedef struct IndexPath /* * TidPath represents a scan by TID + * + * tideval is an implicitly OR'ed list of quals of the form CTID = something. + * Note they are bare quals, not RestrictInfos. */ typedef struct TidPath { @@ -570,13 +573,17 @@ typedef struct HashPath * When we do form the outer join's joinrel, we still need to distinguish * those quals that are actually in that join's JOIN/ON condition from those * that appeared higher in the tree and were pushed down to the join rel - * because they used no other rels. That's what the ispusheddown flag is for; - * it tells us that a qual came from a point above the join of the specific - * set of base rels that it uses (or that the JoinInfo structures claim it - * uses). A clause that originally came from WHERE will *always* have its - * ispusheddown flag set; a clause that came from an INNER JOIN condition, - * but doesn't use all the rels being joined, will also have ispusheddown set - * because it will get attached to some lower joinrel. + * because they used no other rels. That's what the is_pushed_down flag is + * for; it tells us that a qual came from a point above the join of the + * specific set of base rels that it uses (or that the JoinInfo structures + * claim it uses). A clause that originally came from WHERE will *always* + * have its is_pushed_down flag set; a clause that came from an INNER JOIN + * condition, but doesn't use all the rels being joined, will also have + * is_pushed_down set because it will get attached to some lower joinrel. + * + * We also store a valid_everywhere flag, which says that the clause is not + * affected by any lower-level outer join, and therefore any conditions it + * asserts can be presumed true throughout the plan tree. * * In general, the referenced clause might be arbitrarily complex. The * kinds of clauses we can handle as indexscan quals, mergejoin clauses, @@ -602,7 +609,9 @@ typedef struct RestrictInfo Expr *clause; /* the represented clause of WHERE or JOIN */ - bool ispusheddown; /* TRUE if clause was pushed down in level */ + bool is_pushed_down; /* TRUE if clause was pushed down in level */ + + bool valid_everywhere; /* TRUE if valid on every level */ /* * This flag is set true if the clause looks potentially useful as a @@ -611,7 +620,7 @@ typedef struct RestrictInfo * (Whether the operator is actually merge or hash joinable isn't * checked, however.) */ - bool canjoin; + bool can_join; /* The set of relids (varnos) referenced in the clause: */ Relids clause_relids; |