postgres
diff --git a/‎src/backend/executor/execAmi.c
Copy file name to clipboardExpand all lines: src/backend/executor/execAmi.c
+5Lines changed: 5 additions & 0 deletions b/‎src/backend/executor/execAmi.c
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+5Lines changed: 5 additions & 0 deletions
diff --git a/‎src/backend/optimizer/util/plancat.c
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+2Lines changed: 2 additions & 0 deletions b/‎src/backend/optimizer/util/plancat.c
Copy file name to clipboardExpand all lines: src/backend/optimizer/util/plancat.c
+2Lines changed: 2 additions & 0 deletions
diff --git a/‎src/include/nodes/relation.h
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+1Lines changed: 1 addition & 0 deletions b/‎src/include/nodes/relation.h
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+1Lines changed: 1 addition & 0 deletions
@@ -394,6 +394,11 @@ ExecSupportsMarkRestore(Path *pathnode)
 	{
 		case T_IndexScan:
 		case T_IndexOnlyScan:
+			/*
+			 * Not all index types support mark/restore.
+			 */
+			return castNode(IndexPath, pathnode)->indexinfo->amcanmarkpos;
+
 		case T_Material:
 		case T_Sort:
 			return true;
 
@@ -242,6 +242,8 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 			info->amsearchnulls = amroutine->amsearchnulls;
 			info->amhasgettuple = (amroutine->amgettuple != NULL);
 			info->amhasgetbitmap = (amroutine->amgetbitmap != NULL);
+			info->amcanmarkpos = (amroutine->ammarkpos != NULL &&
+								  amroutine->amrestrpos != NULL);
 			info->amcostestimate = amroutine->amcostestimate;
 			Assert(info->amcostestimate != NULL);
 
 
@@ -620,6 +620,7 @@ typedef struct IndexOptInfo
 	bool		amsearchnulls;	/* can AM search for NULL/NOT NULL entries? */
 	bool		amhasgettuple;	/* does AM have amgettuple interface? */
 	bool		amhasgetbitmap; /* does AM have amgetbitmap interface? */
+	bool		amcanmarkpos;	/* does AM support mark/restore? */
 	/* Rather than include amapi.h here, we declare amcostestimate like this */
 	void		(*amcostestimate) ();	/* AM's cost estimator */
 } IndexOptInfo;