[NEOS-1234] Bulk Transformer Set Logic buggy for Mysql

[nickzelei]

I have a database where I fully added everything to the job mappings.

This includes foreign keyed columns.

I would expect something like we see with postgres where you pretty much only get Passthrough Generate Javascript and Transform javascript

Instead I see Passthrough, Use Column Default, and Transform Javascript:

Where is Generate? Also alarming that column default shows up for all columns when in fact most of them do not have a default value.

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[nickzelei]

After some initial debugging, the information_schema.columns.column_default is not really sufficient here, and that is what we are using. We need to update this to return the proper default, if there is one.