diff options
Diffstat (limited to 'src/backend/parser/parse_relation.c')
| -rw-r--r-- | src/backend/parser/parse_relation.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/src/backend/parser/parse_relation.c b/src/backend/parser/parse_relation.c index 3e314bea963..4df92ee310c 100644 --- a/src/backend/parser/parse_relation.c +++ b/src/backend/parser/parse_relation.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/parser/parse_relation.c,v 1.92 2004/01/14 23:01:55 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/parser/parse_relation.c,v 1.93 2004/04/02 19:06:58 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -41,8 +41,6 @@ static Node *scanNameSpaceForRelid(ParseState *pstate, Node *nsnode, Oid relid); static void scanNameSpaceForConflict(ParseState *pstate, Node *nsnode, RangeTblEntry *rte1, const char *aliasname1); -static Node *scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte, - char *colname); static bool isForUpdate(ParseState *pstate, char *refname); static bool get_rte_attribute_is_dropped(RangeTblEntry *rte, AttrNumber attnum); @@ -425,6 +423,24 @@ RTERangeTablePosn(ParseState *pstate, RangeTblEntry *rte, int *sublevels_up) } /* + * Given an RT index and nesting depth, find the corresponding RTE. + * This is the inverse of RTERangeTablePosn. + */ +RangeTblEntry * +GetRTEByRangeTablePosn(ParseState *pstate, + int varno, + int sublevels_up) +{ + while (sublevels_up-- > 0) + { + pstate = pstate->parentParseState; + Assert(pstate != NULL); + } + Assert(varno > 0 && varno <= length(pstate->p_rtable)); + return rt_fetch(varno, pstate->p_rtable); +} + +/* * scanRTEForColumn * Search the column names of a single RTE for the given name. * If found, return an appropriate Var node, else return NULL. @@ -439,7 +455,7 @@ RTERangeTablePosn(ParseState *pstate, RangeTblEntry *rte, int *sublevels_up) * expression can only appear in a FROM clause, and any table named in * FROM will be marked as requiring read access from the beginning. */ -static Node * +Node * scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte, char *colname) { Node *result = NULL; |