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Stop accessing checkAsUser via RTE in some cases

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A future commit will move the checkAsUser field from RangeTblEntry
to a new node that, unlike RTEs, will only be created for tables
mentioned in the query but not for the inheritance child relations
added to the query by the planner.  So, checkAsUser value for a
given child relation will have to be obtained by referring to that
for its ancestor mentioned in the query.

In preparation, it seems better to expand the use of RelOptInfo.userid
during planning in place of rte->checkAsUser so that there will be
fewer places to adjust for the above change.

Given that the child-to-ancestor mapping is not available during the
execution of a given "child" ForeignScan node, add a checkAsUser
field to ForeignScan to carry the child relation's RelOptInfo.userid.

Author: Amit Langote <amitlangote09@gmail.com>
Discussion: https://postgr.es/m/CA+HiwqGFCs2uq7VRKi7g+FFKbP6Ea_2_HkgZb2HPhUfaAKT3ng@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2022-11-30 12:07:03 +01:00
parent d2a4490401
commit 599b33b949
9 changed files with 39 additions and 30 deletions
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6
src/backend/optimizer/plan/createplan.c
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@@ -4148,6 +4148,9 @@ create_foreignscan_plan(PlannerInfo *root, ForeignPath *best_path,
/* Copy cost data from Path to Plan; no need to make FDW do this */
copy_generic_path_info(&scan_plan->scan.plan, &best_path->path);
/* Copy user OID to access as; likewise no need to make FDW do this */
scan_plan->checkAsUser = rel->userid;
/* Copy foreign server OID; likewise, no need to make FDW do this */
scan_plan->fs_server = rel->serverid;
@@ -5794,7 +5797,8 @@ make_foreignscan(List *qptlist,
node->operation = CMD_SELECT;
node->resultRelation = 0;
/* fs_server will be filled in by create_foreignscan_plan */
/* checkAsUser, fs_server will be filled in by create_foreignscan_plan */
node->checkAsUser = InvalidOid;
node->fs_server = InvalidOid;
node->fdw_exprs = fdw_exprs;
node->fdw_private = fdw_private;