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Directly modify foreign tables.

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postgres_fdw can now sent an UPDATE or DELETE statement directly to
the foreign server in simple cases, rather than sending a SELECT FOR
UPDATE statement and then updating or deleting rows one-by-one.

Etsuro Fujita, reviewed by Rushabh Lathia, Shigeru Hanada, Kyotaro
Horiguchi, Albe Laurenz, Thom Brown, and me.
This commit is contained in:
Robert Haas
2016-03-18 13:48:58 -04:00
parent 3422feccca
commit 0bf3ae88af
21 changed files with 1515 additions and 125 deletions
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17
src/backend/executor/nodeForeignscan.c
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@ -48,7 +48,10 @@ ForeignNext(ForeignScanState *node)
/* Call the Iterate function in short-lived context */
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
slot = node->fdwroutine->IterateForeignScan(node);
if (plan->operation != CMD_SELECT)
slot = node->fdwroutine->IterateDirectModify(node);
else
slot = node->fdwroutine->IterateForeignScan(node);
MemoryContextSwitchTo(oldcontext);
/*
@ -226,7 +229,10 @@ ExecInitForeignScan(ForeignScan *node, EState *estate, int eflags)
/*
* Tell the FDW to initialize the scan.
*/
fdwroutine->BeginForeignScan(scanstate, eflags);
if (node->operation != CMD_SELECT)
fdwroutine->BeginDirectModify(scanstate, eflags);
else
fdwroutine->BeginForeignScan(scanstate, eflags);
return scanstate;
}
@ -240,8 +246,13 @@ ExecInitForeignScan(ForeignScan *node, EState *estate, int eflags)
void
ExecEndForeignScan(ForeignScanState *node)
{
ForeignScan *plan = (ForeignScan *) node->ss.ps.plan;
/* Let the FDW shut down */
node->fdwroutine->EndForeignScan(node);
if (plan->operation != CMD_SELECT)
node->fdwroutine->EndDirectModify(node);
else
node->fdwroutine->EndForeignScan(node);
/* Shut down any outer plan. */
if (outerPlanState(node))