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Add C comment

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Add C comment about why we throw an error if the pg_upgrade old/new
database counts don't match.
This commit is contained in:
Bruce Momjian 2011-04-19 19:14:39 -04:00
parent 8c19977e9c
commit 0341944706
1 changed files with 6 additions and 0 deletions
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6
contrib/pg_upgrade/relfilenode.c
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@ -37,6 +37,12 @@ transfer_all_new_dbs(DbInfoArr *old_db_arr,
prep_status("Restoring user relation files\n");
/*
* If the user removed the 'postgres' database from the old cluster,
* this will cause the database counts to not match and throw an error.
* We could allow this to work because the new database is empty (we
* checked), but we don't.
*/
if (old_db_arr->ndbs != new_db_arr->ndbs)
pg_log(PG_FATAL, "old and new clusters have a different number of databases\n");