Create expect_column_set_to_be_unique_case_insensitive.sql

README.md

@@ -88,6 +88,7 @@ To run the tests:
 - [expect_column_values_to_be_unique](#expect_column_values_to_be_unique)
 - [expect_column_values_to_be_of_type](#expect_column_values_to_be_of_type)
 - [expect_column_values_to_be_in_type_list](#expect_column_values_to_be_in_type_list)
+- [expect_column_values_to_have_consistent_casing](#expect_column_values_to_have_consistent_casing)
 
 ### Sets and ranges
 
@@ -410,6 +411,18 @@ tests:
       column_type_list: [date, datetime]
 ```
 
+### [expect_column_values_to_have_consistent_casing](macros/schema_tests/column_values_basic/expect_column_values_to_have_consistent_casing.sql)
+
+Expect a column to have consistent casing. By setting display_inconsistent_columns to true, the inconsistent columns will be displayed.
+
+*Applies to:* Column
+
+```yaml
+tests:
+  - dbt_expectations.expect_column_values_to_have_consistent_casing:
+      display_inconsistent_columns: false # (Optional)
+```
+
 ### [expect_column_values_to_be_in_set](macros/schema_tests/column_values_basic/expect_column_values_to_be_in_set.sql)
 
 Expect each column value to be in a given set.

macros/schema_tests/column_values_basic/expect_column_values_to_have_consistent_casing.sql

@@ -0,0 +1,36 @@
+{% test expect_column_values_to_have_consistent_casing(model, column_name, display_inconsistent_columns=False) %}
+
+with test_data as (
+
+     select
+     distinct {{ column_name }} as distinct_values
+     from
+     {{ model }}
+     where 1=1
+
+ ),
+ {% if display_inconsistent_columns %}
+ validation_errors as (
+
+    select
+    lower(distinct_values) as inconsistent_columns,
+    count(distinct_values) as set_count_case_insensitive
+    from test_data
+    group by 1
+    having count(distinct_values)>1
+
+ )
+ select * from validation_errors
+ {% else %}
+ validation_errors as (
+
+    select
+    count(1) as set_count,
+    count(distinct lower(distinct_values)) as set_count_case_insensitive
+    from test_data
+
+ )
+ select * from validation_errors
+ where set_count!=set_count_case_insensitive
+ {% endif %}
+ {%- endtest -%}