Get country code refactor

[amittiwari1979]

Are you a current Census customer? No

What change(s) does this PR introduce?

• Code refactor to use correlated subquery instead of long case statements in the compiled code.
• Removed domain extension cleanup seed file as we felt it was making the macro too complex.
• Removed redundant entries from seed file in integration data.
• Updated is_personal_email macro to have 3 possible values. True in case domain is personal email, False, in case domain is not a personal email domain and NULL in case macro is not able to extract domain from the email. As we don't know the domain, it's more appropriate to set it as NULL.

Does this PR introduce a breaking change?

• Yes (please provide change details below.)
• No
  Users who were using is_personal_email will get the value as null. If they still want to continue with earlier behaviour, we have added a new param to the macro treat_null_as_false. If this value is set to true, then the null will be interpreted as false and the behaviour will be same as before.

Did you update the dbt_project.yml files with the version upgrade (using semantic versioning)? (In both the main project and integration_tests)

• Yes

Is this PR in response to a previously created issue

• Yes [https://github.com/[Suggestion] Use a subquery to get country codes instead of generating a massive case statement #41]
• No

Select which warehouses were used to test the PR

• BigQuery
• Redshift
• Snowflake
• Postgres
• Databricks
• Other (write name here)

Feedback

Thank you for contributing to a Census dbt package! You can give us feedback in the #tools-census channel of dbt Slack, or on the Operational Analytics Club Slack.

[Stephen986]

Approved with some minor changes requested!

[Stephen986]

Looks great!