Change redshift diststyle behavior (dbt-labs#2246)

  * Don't provide a diststyle to redshift tables when configured as "auto"

CHANGELOG.md

@@ -14,6 +14,7 @@
 - When a macro is called with invalid arguments, include the calling model in the output ([#2073](https://github.com/fishtown-analytics/dbt/issues/2073), [#2238](https://github.com/fishtown-analytics/dbt/pull/2238))
 - When a warn exception is not in a jinja do block, return an empty string instead of None ([#2222](https://github.com/fishtown-analytics/dbt/issues/2222), [#2259](https://github.com/fishtown-analytics/dbt/pull/2259))
 - Add dbt plugin versions to --version([#2272](https://github.com/fishtown-analytics/dbt/issues/2272), [#2279](https://github.com/fishtown-analytics/dbt/pull/2279))
+- When a Redshift table is defined as "auto", don't provide diststyle ([#2246](https://github.com/fishtown-analytics/dbt/issues/2246), [#2298](https://github.com/fishtown-analytics/dbt/pull/2298))
 
 Contributors:
  - [@raalsky](https://github.com/Raalsky) ([#2224](https://github.com/fishtown-analytics/dbt/pull/2224), [#2228](https://github.com/fishtown-analytics/dbt/pull/2228))

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

@@ -3,8 +3,9 @@
  {%- if dist is not none -%}
  {%- set dist = dist.strip().lower() -%}
 
- {%- if dist in ['all', 'even', 'auto'] -%}
+ {%- if dist in ['all', 'even'] -%}
  diststyle {{ dist }}
+ {%- elif dist == "auto" -%}
  {%- else -%}
  diststyle key distkey ({{ dist }})
  {%- endif -%}