Fix copyfuncs/equalfuncs support for ReassignOwnedStmt.

Noah Misch

src/backend/nodes/copyfuncs.c

@@ -3652,7 +3652,7 @@ _copyReassignOwnedStmt(const 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

@@ -1947,7 +1947,7 @@ static bool
 _equalReassignOwnedStmt(const ReassignOwnedStmt *a, const ReassignOwnedStmt *b)
 {
 	COMPARE_NODE_FIELD(roles);
-	COMPARE_NODE_FIELD(newrole);
+	COMPARE_STRING_FIELD(newrole);
 
 	return true;
 }