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Allow custom and foreign scans to have shutdown callbacks.

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This is expected to be useful mostly when performing such scans in
parallel, because in that case it allows (in combination with commit
acf555bc53) nodes below a Gather to get
control just before the DSM segment goes away.

KaiGai Kohei, except that I rewrote the documentation.  Reviewed by
Claudio Freire.

Discussion: http://postgr.es/m/CADyhKSXJK0jUJ8rWv4AmKDhsUh124_rEn39eqgfC5D8fu6xVuw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-02-26 13:36:49 +05:30
parent 285ca26132
commit a315b967cc
9 changed files with 63 additions and 0 deletions
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2
src/include/foreign/fdwapi.h
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@@ -151,6 +151,7 @@ typedef void (*InitializeDSMForeignScan_function) (ForeignScanState *node,
typedef void (*InitializeWorkerForeignScan_function) (ForeignScanState *node,
shm_toc *toc,
void *coordinate);
typedef void (*ShutdownForeignScan_function) (ForeignScanState *node);
typedef bool (*IsForeignScanParallelSafe_function) (PlannerInfo *root,
RelOptInfo *rel,
RangeTblEntry *rte);
@@ -224,6 +225,7 @@ typedef struct FdwRoutine
EstimateDSMForeignScan_function EstimateDSMForeignScan;
InitializeDSMForeignScan_function InitializeDSMForeignScan;
InitializeWorkerForeignScan_function InitializeWorkerForeignScan;
ShutdownForeignScan_function ShutdownForeignScan;
} FdwRoutine;