get_tables_by_prefix, ideal for union_tables jobs

[jdub]

Solution suggested by @drewbanin, enhanced with "exclude" parameter.

[jdub]

This works great without the adapter_macro wrapper, but when I add it, I get this error:

Encountered an error:
not enough values to unpack (expected 2, got 1)

[drewbanin]

@jdub this is great! I believe the not enough values to unpack (expected 2, got 1) error you're seeing was fixed in 0.9.1 (released 1/5). You could try upgrading to see if that fixes this.

Separately, I noticed a bug in how dbt implements adapter_macro which I think will prevent this particular macro from working correctly (for now).

I think the best solution in the short term would be to nix the adapter_macro approach, and instead just place the get_tables_by_prefix macro somewhere like macros/sql/get_tables_by_prefix.sql.

If it makes sense to extend this macro to other adapters in the future, we can definitely do that without breaking backwards compatibility.

[jdub]

Not fixed in 0.9.1 sadly:

$ dbt --version
installed version: 0.9.1
   latest version: 0.9.1
Up to date!
$ dbt run --models awsbilling








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Encountered an error:
not enough values to unpack (expected 2, got 1)

Thanks -- I'll update with your suggested change.

[drewbanin]

@jdub let me know when this is ready for another look. Can you also add documentation to the README.md file?

[jdub]

@drewbanin README updated, with a bit of alphabetical re-ordering for good measure. This is good to go.

[drewbanin]

@jdub groovy - this LGTM! Merging