Fix db2 options

[chrjorgensen]

A fix to DB2 formatter:

• ALTER TABLE RENAME COLUMN is not supported in DB2i

[nene]

Sorry, in the mean time I had already fixed the U&'' strings difference between DB2 and DB2i. Just had forgotten to push my changes.

See: 3a7a53a

[nene]

Also, if you're further interested in improving DB2 support, you might want to review the wiki pages which describe the basic syntax of various dialects.

I updated the first section (identifiers, strings, etc) there with references to DB2 LUW-version and DB2i. With the LOW-version of DB2 I can test out the syntax in dbfiddle. But for DB2i I have no other sources besides the IBM documentation. The "Queries" sections is also mostly updated, the rest is still in todo status.

[chrjorgensen]

Sorry, in the mean time I had already fixed the U&'' strings difference between DB2 and DB2i. Just had forgotten to push my changes.

That's alright - it's better that we are two thinking the same than none of us is thinking about this. 👍
I'll remove the change and force push the `RENAME´ change.

[nene]

Thanks.

[chrjorgensen]

Thank you for doing all this great work on the DB2 dialects!

[nene]

FYI: In general instead of specifying false here, better to just skip the option altogether. At least that's the style that the rest of the tests are following for now. Keeps the tests shorter, as like supportsAlterTable() takes an entire 5 boolean flags.

This concrete case I already cleaned up: 91e4be0

[chrjorgensen]

Noted - only did it this way to clarify that it was on purpose in contrast to the DB2, which has true in renameColumn.