diff options
Diffstat (limited to 'src/backend/parser/analyze.c')
| -rw-r--r-- | src/backend/parser/analyze.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c index 60cce378453..6560b86e4b2 100644 --- a/src/backend/parser/analyze.c +++ b/src/backend/parser/analyze.c @@ -342,6 +342,7 @@ static Query * transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt) { Query *qry = makeNode(Query); + ParseNamespaceItem *nsitem; Node *qual; qry->commandType = CMD_DELETE; @@ -360,8 +361,15 @@ transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt) true, ACL_DELETE); + /* grab the namespace item made by setTargetTable */ + nsitem = (ParseNamespaceItem *) llast(pstate->p_namespace); + + /* there's no DISTINCT in DELETE */ qry->distinctClause = NIL; + /* subqueries in USING can see the result relation only via LATERAL */ + nsitem->p_lateral_only = true; + /* * The USING clause is non-standard SQL syntax, and is equivalent in * functionality to the FROM list that can be specified for UPDATE. The @@ -370,6 +378,9 @@ transformDeleteStmt(ParseState *pstate, DeleteStmt *stmt) */ transformFromClause(pstate, stmt->usingClause); + /* remaining clauses can see the result relation normally */ + nsitem->p_lateral_only = false; + qual = transformWhereClause(pstate, stmt->whereClause, EXPR_KIND_WHERE, "WHERE"); @@ -1889,6 +1900,7 @@ static Query * transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt) { Query *qry = makeNode(Query); + ParseNamespaceItem *nsitem; RangeTblEntry *target_rte; Node *qual; ListCell *origTargetList; @@ -1910,12 +1922,21 @@ transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt) true, ACL_UPDATE); + /* grab the namespace item made by setTargetTable */ + nsitem = (ParseNamespaceItem *) llast(pstate->p_namespace); + + /* subqueries in FROM can see the result relation only via LATERAL */ + nsitem->p_lateral_only = true; + /* * the FROM clause is non-standard SQL syntax. We used to be able to do * this with REPLACE in POSTQUEL so we keep the feature. */ transformFromClause(pstate, stmt->fromClause); + /* remaining clauses can see the result relation normally */ + nsitem->p_lateral_only = false; + qry->targetList = transformTargetList(pstate, stmt->targetList, EXPR_KIND_UPDATE_SOURCE); |