Fix/update grain of multiple sources joined

[graciegoheen]

Updated grain of:

• fct_model_fanout
• fct_source_fanout
• fct_multiple_sources_joined

So that one record is equivalent to one error.

Note: Created a listagg macro to (hopefully) ensure cross-database compatibility. @dave-connors-3 or @b-per could you test this out? I'm also wondering if this piece should be added to the dbt-utils package?

[graciegoheen]

Created a PR to add listagg macro to dbt-utils

[wasilaq]

LGTM!

I'm not sure if we want to add the listagg macro to utils. It looks like the implementation of the function in any given individual data warehouse is pretty straightforward

[graciegoheen]

Hmm - @wasilaq I don't think it's about the level of complexity, more so just having the ability to use the function across multiple warehouses (looking @ other cross-database-macros in dbt-utils). For example split_part is pretty easy to implement in different data warehouses, but having the macro available in dbt-utils allows people to use it and ensure cross-data-warehouse compatibility.

[graciegoheen]

PR for adding listagg macro to dbt-utils - we can remove this macro from our package once it's been merged into dbt-utils