Add an override spot for dbt redshift to throw an error when a None v…

…alue is found.

dbt/include/global_project/macros/unit_test_sql/get_fixture_sql.sql

@@ -22,7 +22,7 @@
     {%- do default_row.update({column_name: (safe_cast("null", column_type) | trim )}) -%}
 {%- endfor -%}
 
-{%- validate_row(rows, 0) -%}
+{{ validate_fixture_rows(rows, row_number) }}
 
 {%- for row in rows -%}
 {%-   set formatted_row = format_row(row, column_name_to_data_types) -%}
@@ -95,10 +95,10 @@ union all
     {{ return(formatted_row) }}
 {%- endmacro -%}
 
+{%- macro validate_fixture_rows(rows, row_number) -%}
+  {{ return(adapter.dispatch('validate_fixture_rows', 'dbt')(rows, row_number)) }}
+{%- endmacro -%}
 
-
-{%- macro validate_row(rows, row_number) -%}
-    {{ log(rows, info=True) }}
-    {%- if rows -%}
-    {%- endif -%}
+{%- macro default__validate_fixture_rows(rows, row_number) -%}
+  {# This is an abstract method for adapter overrides as needed #}
 {%- endmacro -%}