Improve plpython fix comment in pg_upgrade.

diff --git a/contrib/pg_upgrade/function.c b/contrib/pg_upgrade/function.c
index 4505e51a932eb279277dc95bc3f89b32cfc3c037..988486b4503015d0ba05d614a74ba8001e689f0e 100644 (file)
--- a/contrib/pg_upgrade/function.c
+++ b/contrib/pg_upgrade/function.c
@@ -236,6 +236,10 @@ check_loadable_libraries(void)
                 *      plpython2u pointing to it.  For this reason, any reference to
                 *      library name "plpython" in an old PG <= 9.1 cluster must look
                 *      for "plpython2" in the new cluster.
+                *
+                *      For this case, we could check pg_pltemplate, but that only works
+                *      for languages, and does not help with function shared objects,
+                *      so we just do a general fix.
                 */
                if (GET_MAJOR_VERSION(old_cluster.major_version) < 901 &&
                        strcmp(lib, "$libdir/plpython") == 0)