diff options
Diffstat (limited to 'src/include/foreign/fdwapi.h')
| -rw-r--r-- | src/include/foreign/fdwapi.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/src/include/foreign/fdwapi.h b/src/include/foreign/fdwapi.h index 854f17755c4..6bf3a5e2306 100644 --- a/src/include/foreign/fdwapi.h +++ b/src/include/foreign/fdwapi.h @@ -50,20 +50,32 @@ typedef void (*ReScanForeignScan_function) (ForeignScanState *node); typedef void (*EndForeignScan_function) (ForeignScanState *node); +typedef int (*AcquireSampleRowsFunc) (Relation relation, int elevel, + HeapTuple *rows, int targrows, + double *totalrows, + double *totaldeadrows, + BlockNumber *totalpages); + +typedef AcquireSampleRowsFunc (*AnalyzeForeignTable_function) (Relation relation); + /* * FdwRoutine is the struct returned by a foreign-data wrapper's handler * function. It provides pointers to the callback functions needed by the * planner and executor. * - * Currently, all functions must be supplied. Later there may be optional - * additions. It's recommended that the handler initialize the struct with - * makeNode(FdwRoutine) so that all fields are set to zero. + * More function pointers are likely to be added in the future. Therefore + * it's recommended that the handler initialize the struct with + * makeNode(FdwRoutine) so that all fields are set to NULL. This will + * ensure that no fields are accidentally left undefined. */ typedef struct FdwRoutine { NodeTag type; + /* + * These functions are required. + */ GetForeignRelSize_function GetForeignRelSize; GetForeignPaths_function GetForeignPaths; GetForeignPlan_function GetForeignPlan; @@ -72,6 +84,12 @@ typedef struct FdwRoutine IterateForeignScan_function IterateForeignScan; ReScanForeignScan_function ReScanForeignScan; EndForeignScan_function EndForeignScan; + + /* + * These functions are optional. Set the pointer to NULL for any + * that are not provided. + */ + AnalyzeForeignTable_function AnalyzeForeignTable; } FdwRoutine; |