Include external tables in get_columns_in_relation redshift adapter

CHANGELOG.md

@@ -5,10 +5,12 @@
 
 ### Fixes
 - `dbt compile` and `dbt run` failed with `KeyError: 'endpoint_resolver'` when threads > 1 and `method: iam` had been specified in the profiles.yaml ([#2756](https:/fishtown-analytics/dbt/issues/2756), [#2766](https:/fishtown-analytics/dbt/pull/2766))
+- Fix Redshift adapter to include columns from external tables when using the get_columns_in_relation macro ([#2753](https:/fishtown-analytics/dbt/issues/2753), [#2754](https:/fishtown-analytics/dbt/pull/2754))
 
 Contributors:
 - [@Mr-Nobody99](https:/Mr-Nobody99) ([#2732](https:/fishtown-analytics/dbt/pull/2732))
 - [@jweibel22](https:/jweibel22) ([#2766](https:/fishtown-analytics/dbt/pull/2766))
+- [@aiguofer](https:/aiguofer) ([#2754](https:/fishtown-analytics/dbt/pull/2754))
 
 ## dbt 0.18.1b2 (September 22, 2020)
 

plugins/redshift/dbt/include/redshift/macros/adapters.sql

@@ -129,10 +129,51 @@
  where view_name = '{{ relation.identifier }}'
  ),
 
+ external_views as (
+ select
+ columnnum,
+ schemaname,
+ columnname,
+ case
+ when external_type ilike 'character varying%' or external_type ilike 'varchar%'
+ then 'character varying'
+ when external_type ilike 'numeric%' then 'numeric'
+ else external_type
+ end as external_type,
+ case
+ when external_type like 'character%' or external_type like 'varchar%'
+ then nullif(
+ REGEXP_SUBSTR(external_type, '[0-9]+'),
+ '')::int
+ else null
+ end as character_maximum_length,
+ case
+ when external_type like 'numeric%'
+ then nullif(
+ SPLIT_PART(REGEXP_SUBSTR(external_type, '[0-9,]+'), ',', 1),
+ '')::int
+ else null
+ end as numeric_precision,
+ case
+ when external_type like 'numeric%'
+ then nullif(
+ SPLIT_PART(REGEXP_SUBSTR(external_type, '[0-9,]+'), ',', 2),
+ '')::int
+ else null
+ end as numeric_scale
+ from
+ pg_catalog.svv_external_columns
+ where
+ tablename = '{{ relation.identifier }}'
+
+ ),
+
  unioned as (
  select * from bound_views
  union all
  select * from unbound_views
+ union all
+ select * from external_views
  )
 
  select