fix file_format simple name ref only no def

[dmaresma]

fix the issue #273

[xnuinside]

@dmaresma thanks for contribution. Can I ask question? Why you use simple-ddl-parser and not sqlglot, for example? as I understand sqlglot also supports different dialects. Is it because of output format? I'm thinking about adding sqlglot as engine for parser.

[dmaresma]

Hi Xnuinside, I code a CICD command line util to compare ddl : between a local git repo and online database schema, the issue is we are using a SQL Code generator as Matillion (Scheduler and ETL) but the SQL code isn't fancy. We use to deploy Snowflake database's changes with Liquibase, but I decide to use a Declarative way, to compare (with simple-ddl-parser) and generate unified and on-demand SQL deployment script to Alter schemas, just as sqlpackage for Microsoft SQL Server. I don't know if sqlglot can translate SQL ddl as simple-ddl-paser do, but for sure, for Compute Column definition (or Virtual Column) it could be a great improvement.

[xnuinside]

@dmaresma thanks for explicit answer