Commits on Jan 19, 2021

1. Use longer identifier for DatabaseLimits when using Oracle 12.2 or … …

   …higher
   
   Follow rsim#1703.
   
   Oracle enhanced adapter supports longer identifier by rsim#1703.
   I encountered the following error when using `rename_table` in Oracle 12c.
   
   ```console
   New table name 'identifier_of_thirty_bytes_or_more' is too long; the limit is 30 characters
   ```
   
   Because `IDENTIFIER_MAX_LENGTH` constant was fixed to 30 bytes.
   
   This PR will use `max_identifier_length` method instead of the constant and
   accept longer identifier (max 128 bytes) when using Oracle 12.2 or higher.
   
   I encountered the error in Rails 6.0. So I'd like to backport to 6.1 and 6.0 stable branches.

   

   koic committed Jan 19, 2021
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