Upgrading schema test unique_comination_of_columns.sql to allow quoti…

…ng of columns.

macros/schema_tests/unique_combination_of_columns.sql

@@ -1,8 +1,22 @@
-{% macro test_unique_combination_of_columns(model) %}
+{% macro test_unique_combination_of_columns(model, quote_columns = false) %}
 
 {%- set columns = kwargs.get('combination_of_columns', kwargs.get('arg')) %}
 
-{%- set columns_csv=columns | join(', ') %}
+{% if not quote_columns %}
+    {%- set column_list=columns %}
+{% elif quote_columns %}
+    {%- set column_list=[] %}
+        {% for column in columns -%}
+            {% set column_list = column_list.append( adapter.quote(column) ) %}
+        {%- endfor %}
+{% else %}
+    {{ exceptions.raise_compiler_error(
+        "`quote_columns` argument for unique_combination_of_columns test must be one of [True, False] Got: '" ~ quote ~"'.'"
+    ) }}
+{% endif %}
+
+{%- set columns_csv=column_list | join(', ') %}
+
 
 with validation_errors as (