1 files changed, 35 insertions, 1 deletions
diff --git a/src/include/access/amapi.h b/src/include/access/amapi.h
index 35f1061b3a1..1036cca99ca 100644
--- a/src/include/access/amapi.h
+++ b/src/include/access/amapi.h
@@ -27,6 +27,34 @@ struct IndexInfo;
 
 
 /*
+ * Properties for amproperty API.  This list covers properties known to the
+ * core code, but an index AM can define its own properties, by matching the
+ * string property name.
+ */
+typedef enum IndexAMProperty
+{
+	AMPROP_UNKNOWN = 0,			/* anything not known to core code */
+	AMPROP_ASC,					/* column properties */
+	AMPROP_DESC,
+	AMPROP_NULLS_FIRST,
+	AMPROP_NULLS_LAST,
+	AMPROP_ORDERABLE,
+	AMPROP_DISTANCE_ORDERABLE,
+	AMPROP_RETURNABLE,
+	AMPROP_SEARCH_ARRAY,
+	AMPROP_SEARCH_NULLS,
+	AMPROP_CLUSTERABLE,			/* index properties */
+	AMPROP_INDEX_SCAN,
+	AMPROP_BITMAP_SCAN,
+	AMPROP_BACKWARD_SCAN,
+	AMPROP_CAN_ORDER,			/* AM properties */
+	AMPROP_CAN_UNIQUE,
+	AMPROP_CAN_MULTI_COL,
+	AMPROP_CAN_EXCLUDE
+} IndexAMProperty;
+
+
+/*
  * Callback function signatures --- see indexam.sgml for more info.
  */
 
@@ -72,6 +100,11 @@ typedef void (*amcostestimate_function) (struct PlannerInfo *root,
 typedef bytea *(*amoptions_function) (Datum reloptions,
 												  bool validate);
 
+/* report AM, index, or index column property */
+typedef bool (*amproperty_function) (Oid index_oid, int attno,
+								  IndexAMProperty prop, const char *propname,
+												 bool *res, bool *isnull);
+
 /* validate definition of an opclass for this AM */
 typedef bool (*amvalidate_function) (Oid opclassoid);
 
@@ -154,6 +187,7 @@ typedef struct IndexAmRoutine
 	amcanreturn_function amcanreturn;	/* can be NULL */
 	amcostestimate_function amcostestimate;
 	amoptions_function amoptions;
+	amproperty_function amproperty;		/* can be NULL */
 	amvalidate_function amvalidate;
 	ambeginscan_function ambeginscan;
 	amrescan_function amrescan;
@@ -167,7 +201,7 @@ typedef struct IndexAmRoutine
 
 /* Functions in access/index/amapi.c */
 extern IndexAmRoutine *GetIndexAmRoutine(Oid amhandler);
-extern IndexAmRoutine *GetIndexAmRoutineByAmId(Oid amoid);
+extern IndexAmRoutine *GetIndexAmRoutineByAmId(Oid amoid, bool noerror);
 
 extern Datum amvalidate(PG_FUNCTION_ARGS);