Fixing an issue where the mutually exclusive range test doesn't work …

[codigo-ergo-sum]

…with store failures with a multi-column concatenated partition by clause. As per: #423

This is a:

• bug fix PR with no breaking changes — please ensure the base branch is master
• new functionality — please ensure the base branch is the latest dev/ branch
• a breaking change — please ensure the base branch is the latest dev/ branch

Description & motivation

Checklist

• I have verified that these changes work locally on the following warehouses (Note: it's okay if you do not have access to all warehouses, this helps us understand what has been covered)
  • BigQuery
  • Postgres
  • Redshift
  • Snowflake
• I have "dispatched" any new macro(s) so non-core adapters can also use them (e.g. the star() source)
• I have updated the README.md (if applicable)
• I have added tests & descriptions to my models (and macros if applicable)
• I have added an entry to CHANGELOG.md

[joellabes]

Lovely! Thanks @codigo-ergo-sum.

As discussed on the original issue, this could be a breaking change for others who are already using --store-failures so we'll pop this out in 0.8 and include that warning in the changelog.

[joellabes]

Thanks for your contribution @codigo-ergo-sum!