executor_hooks.patch

diff --git a/src/backend/executor/execProcnode.c b/src/backend/executor/execProcnode.c
index 03c2feb..a33e645c 100644
--- a/src/backend/executor/execProcnode.c
+++ b/src/backend/executor/execProcnode.c
@@ -115,7 +115,6 @@
 #include "executor/nodeWorktablescan.h"
 #include "miscadmin.h"
 
-
 /* ------------------------------------------------------------------------
  *		ExecInitNode
  *
@@ -356,6 +355,9 @@ ExecInitNode(Plan *node, EState *estate, int eflags)
 	return result;
 }
 
+/* Hooks for plugins to pre/post process ExecProcNode */
+PreExecProcNode_hook_type preExecProcNode_hook = NULL;
+PostExecProcNode_hook_type postExecProcNode_hook = NULL;
 
 /* ----------------------------------------------------------------
  *		ExecProcNode
@@ -374,7 +376,12 @@ ExecProcNode(PlanState *node)
 		ExecReScan(node);		/* let ReScan handle this */
 
 	if (node->instrument)
+	{
+		if (preExecProcNode_hook)
+			preExecProcNode_hook(node);
+
 		InstrStartNode(node->instrument);
+	}
 
 	switch (nodeTag(node))
 	{
@@ -527,8 +534,13 @@ ExecProcNode(PlanState *node)
 	}
 
 	if (node->instrument)
+	{
 		InstrStopNode(node->instrument, TupIsNull(result) ? 0.0 : 1.0);
 
+		if (postExecProcNode_hook)
+			postExecProcNode_hook(node, result);
+	}
+
 	return result;
 }
 
diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h
index 110bc93..8801419 100644
--- a/src/include/executor/executor.h
+++ b/src/include/executor/executor.h
@@ -95,6 +95,12 @@ extern PGDLLIMPORT ExecutorEnd_hook_type ExecutorEnd_hook;
 typedef bool (*ExecutorCheckPerms_hook_type) (List *, bool);
 extern PGDLLIMPORT ExecutorCheckPerms_hook_type ExecutorCheckPerms_hook;
 
+/* Hook for plugins to pre/post process ExecProcNode() */
+typedef void (*PreExecProcNode_hook_type) (PlanState *node);
+typedef void (*PostExecProcNode_hook_type) (PlanState *node, TupleTableSlot *result);
+extern PGDLLIMPORT PreExecProcNode_hook_type preExecProcNode_hook;
+extern PGDLLIMPORT PostExecProcNode_hook_type postExecProcNode_hook;
+
 
 /*
  * prototypes from functions in execAmi.c