diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 46 |
1 files changed, 25 insertions, 21 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index d1565e74961..6cf128a7f02 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -1923,15 +1923,17 @@ typedef struct UniqueState typedef struct GatherState { PlanState ps; /* its first field is NodeTag */ - bool initialized; - struct ParallelExecutorInfo *pei; - int nreaders; - int nextreader; - int nworkers_launched; - struct TupleQueueReader **reader; - TupleTableSlot *funnel_slot; - bool need_to_scan_locally; + bool initialized; /* workers launched? */ + bool need_to_scan_locally; /* need to read from local plan? */ int64 tuples_needed; /* tuple bound, see ExecSetTupleBound */ + /* these fields are set up once: */ + TupleTableSlot *funnel_slot; + struct ParallelExecutorInfo *pei; + /* all remaining fields are reinitialized during a rescan: */ + int nworkers_launched; /* original number of workers */ + int nreaders; /* number of still-active workers */ + int nextreader; /* next one to try to read from */ + struct TupleQueueReader **reader; /* array with nreaders active entries */ } GatherState; /* ---------------- @@ -1942,25 +1944,27 @@ typedef struct GatherState * merge the results into a single sorted stream. * ---------------- */ -struct GMReaderTuple; +struct GMReaderTupleBuffer; /* private in nodeGatherMerge.c */ typedef struct GatherMergeState { PlanState ps; /* its first field is NodeTag */ - bool initialized; + bool initialized; /* workers launched? */ + bool gm_initialized; /* gather_merge_init() done? */ + bool need_to_scan_locally; /* need to read from local plan? */ + int64 tuples_needed; /* tuple bound, see ExecSetTupleBound */ + /* these fields are set up once: */ + TupleDesc tupDesc; /* descriptor for subplan result tuples */ + int gm_nkeys; /* number of sort columns */ + SortSupport gm_sortkeys; /* array of length gm_nkeys */ struct ParallelExecutorInfo *pei; - int nreaders; - int nworkers_launched; - struct TupleQueueReader **reader; - TupleDesc tupDesc; - TupleTableSlot **gm_slots; + /* all remaining fields are reinitialized during a rescan: */ + int nworkers_launched; /* original number of workers */ + int nreaders; /* number of active workers */ + TupleTableSlot **gm_slots; /* array with nreaders+1 entries */ + struct TupleQueueReader **reader; /* array with nreaders active entries */ + struct GMReaderTupleBuffer *gm_tuple_buffers; /* nreaders tuple buffers */ struct binaryheap *gm_heap; /* binary heap of slot indices */ - bool gm_initialized; /* gather merge initilized ? */ - bool need_to_scan_locally; - int64 tuples_needed; /* tuple bound, see ExecSetTupleBound */ - int gm_nkeys; - SortSupport gm_sortkeys; /* array of length ms_nkeys */ - struct GMReaderTupleBuffer *gm_tuple_buffers; /* tuple buffer per reader */ } GatherMergeState; /* ---------------- |