Hi,

I'm trying to get sqlacodegen working with an existing database with 
multiple schemas. I'm running in a clean python 3.6.10 conda environment 
that only contains sqlacodegen and cx_oracle.

I'm  running the following command:
 sqlacodegen oracle://USER:PASSWORD@ORACLE_HOST:PORT/?service_name=NAME 
--schema SCHEMA

It fails, with some sort of error involving a missing key.

Traceback (most recent call last): File 
"/nfs/shared/miniconda3/envs/sqlacodegen/bin/sqlacodegen", line 8, in 
<module> sys.exit(main()) File 
"/nfs/shared/miniconda3/envs/sqlacodegen/lib/python3.6/site-packages/sqlacodegen/main.py",
 
line 52, in main args.noinflect, args.noclasses, 
nocomments=args.nocomments) File 
"/nfs/shared/miniconda3/envs/sqlacodegen/lib/python3.6/site-packages/sqlacodegen/codegen.py",
 
line 424, in __init__ if isinstance(table.c[colname].type, String): File 
"/nfs/shared/miniconda3/envs/sqlacodegen/lib/python3.6/site-packages/sqlalchemy/sql/base.py",
 
line 1157, in __getitem__ return self._index[key] KeyError: 
'POTENTIAL_DUPLICATE' 

This isn't very informative. Can anyone suggest a way I can start tracing 
what the issue is? 

Thanks
James

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