Add an example for the target data validator.

target-validator/ex.yaml

@@ -0,0 +1,30 @@
+detailedErrors: true
+# We might have a large number of errors so just show the first 5
+numErrorsToReport: 5
+
+email:
+  smtpHost: smtp.example.com
+  subject: Data Validation Summary
+  from: [email protected]
+  to:
+    - [email protected]
+
+tables:
+  - db: uk_data
+    table: adult
+    # Columns that taken together uniquely specifies each row (think of groupBy)
+    keyColumns:
+      - CompanyNumber
+      - EmployerId
+      - CompanyLinkToGPGInfo
+      - ResponsiblePerson
+    # Used to filter
+    condition: MaleBonusPercent >= FemaleBonusPercent
+    checks:
+      # We expect at least 500 records
+      - type: rowCount
+        minNumRows: 500
+      # We don't expect more than 1% not companies in the dataset.
+      - type: nullCheck
+        column: CompanyNumber
+        threshold: 0.01