Jira issue originally created by user ccapndave:
When changing the model in such a way that the schema tool tries to create or drop an index which is also a foreign key an error is sometimes thrown like:
SQLSTATE[HY000]: General error: 1025 Error on rename of '.\mydb#sql-10d8_19' to '.\mydb\auth' (errno: 121)
This seems to be caused by MySQL trying to re-use indexes and I think it depends on exactly what has happened before in this table so I can't give an exact case to reproduce. However, it seems to be InnoDB specific and I'm pretty sure its this bug: http://bugs.mysql.com/bug.php?id=15317
Comment created by ccapndave:
Another report of the issue at http://bugs.mysql.com/bug.php?id=14347
Comment created by @beberlei:
Issue was closed with resolution "Fixed"