Update pg_upgrade C comments.

diff --git a/contrib/pg_upgrade/info.c b/contrib/pg_upgrade/info.c
index 01adc33f089c2eabe7f7fa4841bb187704617004..578bdb9eae691644efd77e7ec53d58ae14a1139b 100644 (file)
--- a/contrib/pg_upgrade/info.c
+++ b/contrib/pg_upgrade/info.c
@@ -54,6 +54,7 @@ gen_db_file_maps(DbInfo *old_db, DbInfo *new_db,
        if (strcmp(old_rel->nspname, "pg_toast") == 0)
            continue;
 
+       /* old/new non-toast relation names match */
        new_rel = relarr_lookup_rel_name(&new_cluster, &new_db->rel_arr,
                                   old_rel->nspname, old_rel->relname);
 
@@ -70,6 +71,7 @@ gen_db_file_maps(DbInfo *old_db, DbInfo *new_db,
            char        old_name[MAXPGPATH], new_name[MAXPGPATH];
            RelInfo    *old_toast, *new_toast;
 
+           /* use the toast relids from the rel_arr for lookups */
            old_toast = relarr_lookup_rel_oid(&old_cluster, &old_db->rel_arr,
                                              old_rel->toastrelid);
            new_toast = relarr_lookup_rel_oid(&new_cluster, &new_db->rel_arr,
@@ -79,12 +81,7 @@ gen_db_file_maps(DbInfo *old_db, DbInfo *new_db,
                    old_toast, new_toast, maps + num_maps);
            num_maps++;
 
-           /*
-            * We also need to provide a mapping for the index of this toast
-            * relation. The procedure is similar to what we did above for
-            * toast relation itself, the only difference being that the
-            * relnames need to be appended with _index.
-            */
+           /* toast indexes are the same, except with an "_index" suffix */
            snprintf(old_name, sizeof(old_name), "%s_index", old_toast->relname);
            snprintf(new_name, sizeof(new_name), "%s_index", new_toast->relname);