Merge pull request #468 from dbt-labs/fix/load-source-coluimn-desc

Author: b-per

integration_tests/models/staging/source_1/source.yml

@@ -8,6 +8,9 @@ sources:
     tables:
       - name: table_1
         description: this is table 1.
+        columns:
+          - name: my_column
+            description: description for my source column
       - name: table_2
       - name: table_4
       - name: table_5

models/staging/graph/base/base_source_columns.sql

@@ -18,6 +18,9 @@ select
     cast(null as {{ dbt.type_string()}}) as name,
     cast(null as {{ dbt_project_evaluator.type_large_string()}}) as description,
     cast(null as {{ dbt.type_string()}}) as data_type,
+    cast(null as {{ dbt.type_string()}}) as constraints,
+    cast(True as boolean) as has_not_null_constraint,
+    cast(0 as {{ dbt.type_int() }}) as constraints_count,
     cast(null as {{ dbt.type_string()}}) as quote
 
 from dummy_cte