* RevalidateCachedQuery: ensure validity of analyzed-and-rewritten query tree. * * What we do here is re-acquire locks and redo parse analysis if necessary. * On return, the query_list is valid and we have sufficient locks to begin * planning. * * If any parse analysis activity is required, the caller's memory context is * used for that work. * * The result value is the transient analyzed
| 562 | * GPDB: See GetCachedPlan() for why intoClause is added here. |
| 563 | */ |
| 564 | static List * |
| 565 | RevalidateCachedQuery(CachedPlanSource *plansource, |
| 566 | QueryEnvironment *queryEnv, |
| 567 | IntoClause *intoClause) |
| 568 | { |
| 569 | bool snapshot_set; |
| 570 | RawStmt *rawtree; |
| 571 | List *tlist; /* transient query-tree list */ |
| 572 | List *qlist; /* permanent query-tree list */ |
| 573 | TupleDesc resultDesc; |
| 574 | MemoryContext querytree_context; |
| 575 | MemoryContext oldcxt; |
| 576 | |
| 577 | /* |
| 578 | * For one-shot plans, we do not support revalidation checking; it's |
| 579 | * assumed the query is parsed, planned, and executed in one transaction, |
| 580 | * so that no lock re-acquisition is necessary. Also, there is never any |
| 581 | * need to revalidate plans for transaction control commands (and we |
| 582 | * mustn't risk any catalog accesses when handling those). |
| 583 | */ |
| 584 | if (plansource->is_oneshot || IsTransactionStmtPlan(plansource)) |
| 585 | { |
| 586 | Assert(plansource->is_valid); |
| 587 | return NIL; |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | * If the query is currently valid, we should have a saved search_path --- |
| 592 | * check to see if that matches the current environment. If not, we want |
| 593 | * to force replan. |
| 594 | */ |
| 595 | if (plansource->is_valid) |
| 596 | { |
| 597 | Assert(plansource->search_path != NULL); |
| 598 | if (!OverrideSearchPathMatchesCurrent(plansource->search_path)) |
| 599 | { |
| 600 | /* Invalidate the querytree and generic plan */ |
| 601 | plansource->is_valid = false; |
| 602 | if (plansource->gplan) |
| 603 | plansource->gplan->is_valid = false; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * If the query rewrite phase had a possible RLS dependency, we must redo |
| 609 | * it if either the role or the row_security setting has changed. |
| 610 | */ |
| 611 | if (plansource->is_valid && plansource->dependsOnRLS && |
| 612 | (plansource->rewriteRoleId != GetUserId() || |
| 613 | plansource->rewriteRowSecurity != row_security)) |
| 614 | plansource->is_valid = false; |
| 615 | |
| 616 | /* |
| 617 | * If the query is currently valid, acquire locks on the referenced |
| 618 | * objects; then check again. We need to do it this way to cover the race |
| 619 | * condition that an invalidation message arrives before we get the locks. |
| 620 | */ |
| 621 | if (plansource->is_valid && intoClause == NULL) |
no test coverage detected