Fix cardinality test error

[joellabes]

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

418278c changed from group by 1 to group by {{ column_name }} to add t-sql support.

Table b's column name should be field instead - if its name doesn't happen to be the same column name as table a, you get an error.

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 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]

@clrcrl can you let me know what failed with the integration test please? I've tested the fix against my project and it worked, so I must have misconfigured something in the integration tests

[joellabes]

@ Yan Karklin set me right! 🎉 Had forgotten to include the package's name (I forgot that the integration test project was different to the utils project)

[clrcrl]

Changing over to dev/0.7.0 to avoid another 0.6.x release :)