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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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69
src/include/foreign/fdwapi.h
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@@ -38,9 +38,6 @@ typedef ForeignScan *(*GetForeignPlan_function) (PlannerInfo *root,
List *tlist,
List *scan_clauses);
typedef void (*ExplainForeignScan_function) (ForeignScanState *node,
struct ExplainState *es);
typedef void (*BeginForeignScan_function) (ForeignScanState *node,
int eflags);
@@ -50,6 +47,48 @@ typedef void (*ReScanForeignScan_function) (ForeignScanState *node);
typedef void (*EndForeignScan_function) (ForeignScanState *node);
typedef void (*AddForeignUpdateTargets_function) (Query *parsetree,
RangeTblEntry *target_rte,
Relation target_relation);
typedef List *(*PlanForeignModify_function) (PlannerInfo *root,
ModifyTable *plan,
Index resultRelation,
int subplan_index);
typedef void (*BeginForeignModify_function) (ModifyTableState *mtstate,
ResultRelInfo *rinfo,
List *fdw_private,
int subplan_index,
int eflags);
typedef TupleTableSlot *(*ExecForeignInsert_function) (EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
typedef TupleTableSlot *(*ExecForeignUpdate_function) (EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
typedef TupleTableSlot *(*ExecForeignDelete_function) (EState *estate,
ResultRelInfo *rinfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
typedef void (*EndForeignModify_function) (EState *estate,
ResultRelInfo *rinfo);
typedef void (*ExplainForeignScan_function) (ForeignScanState *node,
struct ExplainState *es);
typedef void (*ExplainForeignModify_function) (ModifyTableState *mtstate,
ResultRelInfo *rinfo,
List *fdw_private,
int subplan_index,
struct ExplainState *es);
typedef int (*AcquireSampleRowsFunc) (Relation relation, int elevel,
HeapTuple *rows, int targrows,
double *totalrows,
@@ -73,22 +112,34 @@ typedef struct FdwRoutine
{
NodeTag type;
/*
* These functions are required.
*/
/* Functions for scanning foreign tables */
GetForeignRelSize_function GetForeignRelSize;
GetForeignPaths_function GetForeignPaths;
GetForeignPlan_function GetForeignPlan;
ExplainForeignScan_function ExplainForeignScan;
BeginForeignScan_function BeginForeignScan;
IterateForeignScan_function IterateForeignScan;
ReScanForeignScan_function ReScanForeignScan;
EndForeignScan_function EndForeignScan;
/*
* These functions are optional. Set the pointer to NULL for any that are
* not provided.
* Remaining functions are optional. Set the pointer to NULL for any that
* are not provided.
*/
/* Functions for updating foreign tables */
AddForeignUpdateTargets_function AddForeignUpdateTargets;
PlanForeignModify_function PlanForeignModify;
BeginForeignModify_function BeginForeignModify;
ExecForeignInsert_function ExecForeignInsert;
ExecForeignUpdate_function ExecForeignUpdate;
ExecForeignDelete_function ExecForeignDelete;
EndForeignModify_function EndForeignModify;
/* Support functions for EXPLAIN */
ExplainForeignScan_function ExplainForeignScan;
ExplainForeignModify_function ExplainForeignModify;
/* Support functions for ANALYZE */
AnalyzeForeignTable_function AnalyzeForeignTable;
} FdwRoutine;