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More pg_upgrade relfilenode C comments added.

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This commit is contained in:
Bruce Momjian 2011-01-07 22:57:30 -05:00
parent 3095643d37
commit 2f657e4d72
2 changed files with 9 additions and 1 deletions
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6
contrib/pg_upgrade/info.c
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@ -132,7 +132,13 @@ create_rel_filename_map(const char *old_data, const char *new_data,
new_cluster.tablespace_suffix, new_db->db_oid);
}
/*
* old_relfilenode might differ from pg_class.oid (and hence
* new_relfilenode) because of CLUSTER, REINDEX, or VACUUM FULL.
*/
map->old_relfilenode = old_rel->relfilenode;
/* new_relfilenode will match old and new pg_class.oid */
map->new_relfilenode = new_rel->relfilenode;
/* used only for logging and error reporing, old/new are identical */

4
contrib/pg_upgrade/pg_upgrade.c
View File

@ -19,7 +19,9 @@
* in a cluster, but they can diverge due to CLUSTER, REINDEX, or VACUUM
* FULL. The new cluster will have matching pg_class.oid and
* pg_class.relfilenode values and be based on the old oid value. This can
* cause the old and new pg_class.relfilenode values to differ.
* cause the old and new pg_class.relfilenode values to differ. In summary,
* old and new pg_class.oid and new pg_class.relfilenode will have the
* same value, and old pg_class.relfilenode might differ.
*
* We control all assignments of pg_type.oid because these oids are stored
* in user composite type values.