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Allow insert and update tuple routing and COPY for foreign tables.

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Also enable this for postgres_fdw.

Etsuro Fujita, based on an earlier patch by Amit Langote. The larger
patch series of which this is a part has been reviewed by Amit
Langote, David Fetter, Maksim Milyutin, Álvaro Herrera, Stephen Frost,
and me.  Minor documentation changes to the final version by me.

Discussion: http://postgr.es/m/29906a26-da12-8c86-4fb9-d8f88442f2b9@lab.ntt.co.jp
This commit is contained in:
Robert Haas
2018-04-06 19:16:11 -04:00
parent cb1ff1e5af
commit 3d956d9562
16 changed files with 924 additions and 91 deletions
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96
contrib/postgres_fdw/postgres_fdw.c
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@ -319,6 +319,10 @@ static TupleTableSlot *postgresExecForeignDelete(EState *estate,
TupleTableSlot *planSlot);
static void postgresEndForeignModify(EState *estate,
ResultRelInfo *resultRelInfo);
static void postgresBeginForeignInsert(ModifyTableState *mtstate,
ResultRelInfo *resultRelInfo);
static void postgresEndForeignInsert(EState *estate,
ResultRelInfo *resultRelInfo);
static int postgresIsForeignRelUpdatable(Relation rel);
static bool postgresPlanDirectModify(PlannerInfo *root,
ModifyTable *plan,
@ -473,6 +477,8 @@ postgres_fdw_handler(PG_FUNCTION_ARGS)
routine->ExecForeignUpdate = postgresExecForeignUpdate;
routine->ExecForeignDelete = postgresExecForeignDelete;
routine->EndForeignModify = postgresEndForeignModify;
routine->BeginForeignInsert = postgresBeginForeignInsert;
routine->EndForeignInsert = postgresEndForeignInsert;
routine->IsForeignRelUpdatable = postgresIsForeignRelUpdatable;
routine->PlanDirectModify = postgresPlanDirectModify;
routine->BeginDirectModify = postgresBeginDirectModify;
@ -1959,6 +1965,96 @@ postgresEndForeignModify(EState *estate,
finish_foreign_modify(fmstate);
}
/*
* postgresBeginForeignInsert
* Begin an insert operation on a foreign table
*/
static void
postgresBeginForeignInsert(ModifyTableState *mtstate,
ResultRelInfo *resultRelInfo)
{
PgFdwModifyState *fmstate;
Plan *plan = mtstate->ps.plan;
Relation rel = resultRelInfo->ri_RelationDesc;
RangeTblEntry *rte;
Query *query;
PlannerInfo *root;
TupleDesc tupdesc = RelationGetDescr(rel);
int attnum;
StringInfoData sql;
List *targetAttrs = NIL;
List *retrieved_attrs = NIL;
bool doNothing = false;
initStringInfo(&sql);
/* Set up largely-dummy planner state. */
rte = makeNode(RangeTblEntry);
rte->rtekind = RTE_RELATION;
rte->relid = RelationGetRelid(rel);
rte->relkind = RELKIND_FOREIGN_TABLE;
query = makeNode(Query);
query->commandType = CMD_INSERT;
query->resultRelation = 1;
query->rtable = list_make1(rte);
root = makeNode(PlannerInfo);
root->parse = query;
/* We transmit all columns that are defined in the foreign table. */
for (attnum = 1; attnum <= tupdesc->natts; attnum++)
{
Form_pg_attribute attr = TupleDescAttr(tupdesc, attnum - 1);
if (!attr->attisdropped)
targetAttrs = lappend_int(targetAttrs, attnum);
}
/* Check if we add the ON CONFLICT clause to the remote query. */
if (plan)
{
OnConflictAction onConflictAction = ((ModifyTable *) plan)->onConflictAction;
/* We only support DO NOTHING without an inference specification. */
if (onConflictAction == ONCONFLICT_NOTHING)
doNothing = true;
else if (onConflictAction != ONCONFLICT_NONE)
elog(ERROR, "unexpected ON CONFLICT specification: %d",
(int) onConflictAction);
}
/* Construct the SQL command string. */
deparseInsertSql(&sql, root, 1, rel, targetAttrs, doNothing,
resultRelInfo->ri_returningList, &retrieved_attrs);
/* Construct an execution state. */
fmstate = create_foreign_modify(mtstate->ps.state,
resultRelInfo,
CMD_INSERT,
NULL,
sql.data,
targetAttrs,
retrieved_attrs != NIL,
retrieved_attrs);
resultRelInfo->ri_FdwState = fmstate;
}
/*
* postgresEndForeignInsert
* Finish an insert operation on a foreign table
*/
static void
postgresEndForeignInsert(EState *estate,
ResultRelInfo *resultRelInfo)
{
PgFdwModifyState *fmstate = (PgFdwModifyState *) resultRelInfo->ri_FdwState;
Assert(fmstate != NULL);
/* Destroy the execution state */
finish_foreign_modify(fmstate);
}
/*
* postgresIsForeignRelUpdatable
* Determine whether a foreign table supports INSERT, UPDATE and/or