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Support writable foreign tables.

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This patch adds the core-system infrastructure needed to support updates
on foreign tables, and extends contrib/postgres_fdw to allow updates
against remote Postgres servers.  There's still a great deal of room for
improvement in optimization of remote updates, but at least there's basic
functionality there now.

KaiGai Kohei, reviewed by Alexander Korotkov and Laurenz Albe, and rather
heavily revised by Tom Lane.
This commit is contained in:
Tom Lane
2013-03-10 14:14:53 -04:00
parent 7f49a67f95
commit 21734d2fb8
29 changed files with 3672 additions and 347 deletions
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54
src/backend/optimizer/plan/createplan.c
View File

@ -20,6 +20,7 @@
#include <math.h>
#include "access/skey.h"
#include "catalog/pg_class.h"
#include "foreign/fdwapi.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
@ -4695,7 +4696,8 @@ make_result(PlannerInfo *root,
* to make it look better sometime.
*/
ModifyTable *
make_modifytable(CmdType operation, bool canSetTag,
make_modifytable(PlannerInfo *root,
CmdType operation, bool canSetTag,
List *resultRelations,
List *subplans, List *returningLists,
List *rowMarks, int epqParam)
@ -4703,7 +4705,10 @@ make_modifytable(CmdType operation, bool canSetTag,
ModifyTable *node = makeNode(ModifyTable);
Plan *plan = &node->plan;
double total_size;
List *fdw_private_list;
ListCell *subnode;
ListCell *lc;
int i;
Assert(list_length(resultRelations) == list_length(subplans));
Assert(returningLists == NIL ||
@ -4746,6 +4751,53 @@ make_modifytable(CmdType operation, bool canSetTag,
node->rowMarks = rowMarks;
node->epqParam = epqParam;
/*
* For each result relation that is a foreign table, allow the FDW to
* construct private plan data, and accumulate it all into a list.
*/
fdw_private_list = NIL;
i = 0;
foreach(lc, resultRelations)
{
Index rti = lfirst_int(lc);
FdwRoutine *fdwroutine;
List *fdw_private;
/*
* If possible, we want to get the FdwRoutine from our RelOptInfo for
* the table. But sometimes we don't have a RelOptInfo and must get
* it the hard way. (In INSERT, the target relation is not scanned,
* so it's not a baserel; and there are also corner cases for
* updatable views where the target rel isn't a baserel.)
*/
if (rti < root->simple_rel_array_size &&
root->simple_rel_array[rti] != NULL)
{
RelOptInfo *resultRel = root->simple_rel_array[rti];
fdwroutine = resultRel->fdwroutine;
}
else
{
RangeTblEntry *rte = planner_rt_fetch(rti, root);
Assert(rte->rtekind == RTE_RELATION);
if (rte->relkind == RELKIND_FOREIGN_TABLE)
fdwroutine = GetFdwRoutineByRelId(rte->relid);
else
fdwroutine = NULL;
}
if (fdwroutine != NULL &&
fdwroutine->PlanForeignModify != NULL)
fdw_private = fdwroutine->PlanForeignModify(root, node, rti, i);
else
fdw_private = NIL;
fdw_private_list = lappend(fdw_private_list, fdw_private);
i++;
}
node->fdwPrivLists = fdw_private_list;
return node;
}