2 files changed, 30 insertions, 1 deletions
diff --git a/src/include/nodes/pathnodes.h b/src/include/nodes/pathnodes.h
index e5dd15098f6..ad2726f026f 100644
--- a/src/include/nodes/pathnodes.h
+++ b/src/include/nodes/pathnodes.h
@@ -2133,10 +2133,12 @@ typedef struct MemoizePath
 								 * complete after caching the first record. */
 	bool		binary_mode;	/* true when cache key should be compared bit
 								 * by bit, false when using hash equality ops */
-	Cardinality calls;			/* expected number of rescans */
 	uint32		est_entries;	/* The maximum number of entries that the
 								 * planner expects will fit in the cache, or 0
 								 * if unknown */
+	Cardinality est_calls;		/* expected number of rescans */
+	Cardinality est_unique_keys;	/* estimated unique keys, for EXPLAIN */
+	double		est_hit_ratio;	/* estimated cache hit ratio, for EXPLAIN */
 } MemoizePath;
 
 /*
diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h
index 4f59e30d62d..6d8e1e99db3 100644
--- a/src/include/nodes/plannodes.h
+++ b/src/include/nodes/plannodes.h
@@ -29,6 +29,20 @@
  */
 
 /* ----------------
+ *		CachedPlanType
+ *
+ * CachedPlanType identifies whether a PlannedStmt is a cached plan, and if
+ * so, whether it is generic or custom.
+ * ----------------
+ */
+typedef enum CachedPlanType
+{
+	PLAN_CACHE_NONE = 0,		/* Not a cached plan */
+	PLAN_CACHE_GENERIC,			/* Generic cached plan */
+	PLAN_CACHE_CUSTOM,			/* Custom cached plan */
+} CachedPlanType;
+
+/* ----------------
  *		PlannedStmt node
  *
  * The output of the planner is a Plan tree headed by a PlannedStmt node.
@@ -58,6 +72,9 @@ typedef struct PlannedStmt
 	/* plan identifier (can be set by plugins) */
 	int64		planId;
 
+	/* type of cached plan */
+	CachedPlanType cached_plan_type;
+
 	/* is it insert|update|delete|merge RETURNING? */
 	bool		hasReturning;
 
@@ -1056,6 +1073,16 @@ typedef struct Memoize
 
 	/* paramids from param_exprs */
 	Bitmapset  *keyparamids;
+
+	/* Estimated number of rescans, for EXPLAIN */
+	Cardinality est_calls;
+
+	/* Estimated number of distinct lookup keys, for EXPLAIN */
+	Cardinality est_unique_keys;
+
+	/* Estimated cache hit ratio, for EXPLAIN */
+	double		est_hit_ratio;
+
 } Memoize;
 
 /* ----------------