Support Id with catalog in dbUnquoteIdentifier

[raffscallion]

Extended dbUnquoteIdentifier to support Id objects with a catalog attribute. This issue was identified in, and partially resolves, #175. dbWriteTable will now succeed in non-default schema as long as the catalog is specified.

[raffscallion]

Hmm, I apologize. This is my first attempt at a pull request. I'm not sure how to interpret or pass that check, but I'll look into it.

[jimhester]

The check is saying there were no tests which run the modified code, so you would have to write a test case for this to pass it, the best place to add it would be (I think) in https://github.com/r-dbi/DBI/blob/master/tests/testthat/test-quote.R

[raffscallion]

Thanks, @jimhester. Tests are in - hope they're reasonable.

[krlmlr]

Thanks!

[StigKorsnes]

Any updates on this?
When is next relase, and is this issue fixed in it? I guess I`m asking If I need to use alternatives, or a solution is at hand.
Was using dbWriteTable successfully with SQL 2016 and dbUnquoteIdentifier() with Id(catalog,schema,table) back in march.

Any help appreciated,
Stig

[krlmlr]

I'm planning a release round of DBI and related packages by end of February.