diff options
Diffstat (limited to 'src/include/nodes/relation.h')
| -rw-r--r-- | src/include/nodes/relation.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h index c7225a1e692..d6b13ca8e39 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 1.142 2007/05/22 01:40:33 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.143 2007/05/22 23:23:57 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -1042,6 +1042,12 @@ typedef struct InnerIndexscanInfo * It is not valid for either min_lefthand or min_righthand to be empty sets; * if they were, this would break the logic that enforces join order. * + * delay_upper_joins is set TRUE if we detect a pushed-down clause that has + * to be evaluated after this join is formed (because it references the RHS). + * Any outer joins that have such a clause and this join in their RHS cannot + * commute with this join, because that would leave noplace to check the + * pushed-down clause. (We don't track this for FULL JOINs, either.) + * * Note: OuterJoinInfo directly represents only LEFT JOIN and FULL JOIN; * RIGHT JOIN is handled by switching the inputs to make it a LEFT JOIN. * We make an OuterJoinInfo for FULL JOINs even though there is no flexibility @@ -1055,6 +1061,7 @@ typedef struct OuterJoinInfo Relids min_righthand; /* base relids in minimum RHS for join */ bool is_full_join; /* it's a FULL OUTER JOIN */ bool lhs_strict; /* joinclause is strict for some LHS rel */ + bool delay_upper_joins; /* can't commute with upper RHS */ } OuterJoinInfo; /* |