diff options
Diffstat (limited to 'src/include/nodes/parsenodes.h')
| -rw-r--r-- | src/include/nodes/parsenodes.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h index 97d5df935ac..1208def12ce 100644 --- a/src/include/nodes/parsenodes.h +++ b/src/include/nodes/parsenodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.278 2005/04/28 21:47:17 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.279 2005/06/03 23:05:29 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -465,7 +465,10 @@ typedef struct DefElem * those columns are known to be dropped at parse time. Again, however, * a stored rule might contain entries for columns dropped since the rule * was created. (This is only possible for columns not actually referenced - * in the rule.) + * in the rule.) When loading a stored rule, we replace the joinaliasvars + * items for any such columns with NULL Consts. (We can't simply delete + * them from the joinaliasvars list, because that would affect the attnums + * of Vars referencing the rest of the list.) * * inh is TRUE for relation references that should be expanded to include * inheritance children, if the rel has any. This *must* be FALSE for @@ -535,7 +538,10 @@ typedef struct RangeTblEntry * to the columns of the join result. An alias Var referencing column * K of the join result can be replaced by the K'th element of * joinaliasvars --- but to simplify the task of reverse-listing - * aliases correctly, we do not do that until planning time. + * aliases correctly, we do not do that until planning time. In a Query + * loaded from a stored rule, it is also possible for joinaliasvars + * items to be NULL Consts, denoting columns dropped since the rule was + * made. */ JoinType jointype; /* type of join */ List *joinaliasvars; /* list of alias-var expansions */ |