change private on ext_nodes in WRITE_NODE_FIELD(private) and READ_NODE_FIELD(private).

Author: Alena Rybakina

aqo_pg15.

@@ -76,7 +76,7 @@ index 3f8e58626cc..996e21f6946 100644
 WRITE_NODE_FIELD(initPlan);
 WRITE_BITMAPSET_FIELD(extParam);
 WRITE_BITMAPSET_FIELD(allParam);
-+	/*WRITE_NODE_FIELD(private); */
++	/*WRITE_NODE_FIELD(ext_nodes); */
 }
 
 /*
@@ -89,7 +89,7 @@ index c84e5af3a26..7ded7f5397b 100644
 READ_BITMAPSET_FIELD(extParam);
 READ_BITMAPSET_FIELD(allParam);
 +	local_node->ext_nodes = NIL;
-+	/* READ_NODE_FIELD(private);
++	/* READ_NODE_FIELD(ext_nodes);
 + * Don't serialize this field. It is required to serialize RestrictInfo and
 + * EqualenceClass.
 +	*/