Fix copyfuncs/equalfuncs support for ReassignOwnedStmt.

Noah Misch

src/backend/nodes/copyfuncs.c

@@ -3319,7 +3319,7 @@ _copyReassignOwnedStmt(ReassignOwnedStmt *from)
 	ReassignOwnedStmt *newnode = makeNode(ReassignOwnedStmt);
 
 	COPY_NODE_FIELD(roles);
-	COPY_SCALAR_FIELD(newrole);
+	COPY_STRING_FIELD(newrole);
 
 	return newnode;
 }

src/backend/nodes/equalfuncs.c

@@ -1837,7 +1837,7 @@ static bool
 _equalReassignOwnedStmt(ReassignOwnedStmt *a, ReassignOwnedStmt *b)
 {
 	COMPARE_NODE_FIELD(roles);
-	COMPARE_NODE_FIELD(newrole);
+	COMPARE_STRING_FIELD(newrole);
 
 	return true;
 }