Enhancements: Partition by list of columns for mutually_exclusive_ranges test

[chinmaypandya]

resolves #

Problem

Previously mutually_exclusive_ranges test accepted a single column as a partition window.

data_tests:
      - dbt_utils.mutually_exclusive_ranges:
          lower_bound_column: valid_from
          upper_bound_column: valid_to
          partition_by: subscription_id

Solution

New features includes the ability to provide list of columns for partition_by

data_tests:
      - dbt_utils.mutually_exclusive_ranges:
          lower_bound_column: valid_from
          upper_bound_column: valid_to
          partition_by:
            - subscription_id
            - region

Code Solution

Check if partition_by is a sequence (list/tuple) and handle partition clause accordingly.

{% if partition_by %}
    {% if partition_by is string %}
        {% set partition_clause = "partition by " ~ partition_by %}
    {% elif partition_by is sequence and partition_by is not string and partition_by | length > 0 %}
        {% set partition_clause = "partition by " ~ partition_by | join(', ') %}
     -- snippet
    ....
{% endif %}

Checklist

• This code is associated with an issue which has been triaged and accepted for development.
  Closes Add a list of columns as a partition by feature to mutually_exclusive_ranges test #1075
• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
  Integration Tests:

Compiled:

• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the README.md (if applicable)