chore: add Redshift support

CONTRIBUTING.md

@@ -78,12 +78,18 @@ Tox will take care of installing the dependencies for each environment, so you d
     tox -e integration_snowflake # For the Snowflake tests
     tox -e integration_databricks # For the Databricks tests
     tox -e integration_bigquery # For the BigQuery tests
+    tox -e integration_redshift # For the Redshift testss
     ```
 
 The Spark tests require installing the [ODBC driver](https://www.databricks.com/spark/odbc-drivers-download). On a Mac,
 DBT_ENV_SPARK_DRIVER_PATH should be set to `/Library/simba/spark/lib/libsparkodbc_sbu.dylib`. Spark tests have not yet
 been added to the integration tests.
 
+The Redshift tests require your AWS credentials configured in the current environment (either as environment variables or in your credentials
+file - see [Configure the AWS cli](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-configure.html)).  They are currently configured with IAM
+authorisation, so your principal will require the redshift:getClusterCredentials permission to retrieve the password for the specified redshift
+database user.
+
 If you don't have access to a particular database type, this isn't a problem. Test on the one you do have, and let us know in the PR.
 
 #### SQLFluff

integration_test_project/example-env.sh

@@ -16,6 +16,10 @@ export DBT_ENV_SECRET_DATABRICKS_TOKEN=
 export DBT_ENV_SECRET_GCP_PROJECT=
 export DBT_ENV_SPARK_DRIVER_PATH= # /Library/simba/spark/lib/libsparkodbc_sbu.dylib on a Mac
 export DBT_ENV_SPARK_ENDPOINT= # The endpoint ID from the Databricks HTTP path
+export DBT_ENV_SECRET_REDSHIFT_HOST=
+export DBT_ENV_SECRET_REDSHIFT_CLUSTER_ID=
+export DBT_ENV_SECRET_REDSHIFT_DB=
+export DBT_ENV_SECRET_REDSHIFT_USER=
 
 # dbt environment variables, change these
 export DBT_VERSION="1_5_0"

integration_test_project/profiles.yml

@@ -63,3 +63,13 @@ dbt_artifacts:
       trust_cert: True
       user: sa
       password: "123"
+    redshift:
+      type: redshift
+      method: iam
+      threads: 8
+      host: "{{ env_var('DBT_ENV_SECRET_REDSHIFT_HOST') }}"
+      port: 5439
+      dbname: "{{ env_var('DBT_ENV_SECRET_REDSHIFT_DB') }}"
+      user: "{{ env_var('DBT_ENV_SECRET_REDSHIFT_USER') }}"
+      schema: dbt_artifacts_test_commit_{{ env_var('DBT_VERSION', '') }}_{{ env_var('GITHUB_SHA_OVERRIDE', '') if env_var('GITHUB_SHA_OVERRIDE', '') else env_var('GITHUB_SHA') }}
+      cluster_id: "{{ env_var('DBT_ENV_SECRET_REDSHIFT_CLUSTER_ID') }}"

macros/_macros.yml

@@ -57,6 +57,10 @@ macros:
     description: |
       Dependent on the adapter type, returns the native type for storing JSON.
 
+  - name: type_string
+    description: |
+      Dependent on the adapter type, returns the native type for storing a string.
+
   ## MIGRATION ##
   - name: migrate_from_v0_to_v1
     description: |

macros/database_specific_helpers/type_helpers.sql

@@ -26,10 +26,14 @@
    json
 {% endmacro %}
 
+{% macro redshift__type_json() %}
+   super
+{% endmacro %}
+
 {#- ARRAY -#}
 
 {% macro type_array() %}
-    {{ return(adapter.dispatch('type_array', 'dbt_artifacts')()) }}
+   {{ return(adapter.dispatch('type_array', 'dbt_artifacts')()) }}
 {% endmacro %}
 
 {% macro default__type_array() %}
@@ -43,3 +47,19 @@
 {% macro bigquery__type_array() %}
    array<string>
 {% endmacro %}
+
+{% macro redshift__type_array() %}
+   super
+{% endmacro %}
+
+{% macro type_string() %}
+   {{ return(adapter.dispatch('type_string', 'dbt_artifacts')()) }}
+{% endmacro %}
+
+{% macro default__type_string() %}
+   {{ return(api.Column.translate_type("string")) }}
+{% endmacro %}
+
+{% macro redshift__type_string() %}
+   varchar(max)
+{% endmacro %}

tox.ini

@@ -68,6 +68,9 @@ profiles_dir = integration_test_project
 
 [testenv]
 passenv =
+    AWS_ACCESS_KEY_ID
+    AWS_SECRET_ACCESS_KEY
+    AWS_SESSION_TOKEN
     DBT_PROFILES_DIR
     GITHUB_SHA_OVERRIDE
     GITHUB_SHA
@@ -84,6 +87,10 @@ passenv =
     DBT_ENV_SECRET_GCP_PROJECT
     DBT_ENV_SPARK_DRIVER_PATH
     DBT_ENV_SPARK_ENDPOINT
+    DBT_ENV_SECRET_REDSHIFT_HOST
+    DBT_ENV_SECRET_REDSHIFT_CLUSTER_ID
+    DBT_ENV_SECRET_REDSHIFT_DB
+    DBT_ENV_SECRET_REDSHIFT_USER
     GOOGLE_APPLICATION_CREDENTIALS
     DBT_CLOUD_PROJECT_ID
     DBT_CLOUD_JOB_ID
@@ -288,6 +295,15 @@ commands =
     dbt deps
     dbt build --target bigquery --vars '"my_var": "my value"'
 
+# Redshift integration test
+[testenv:integration_test_redshift]
+changedir = integration_test_project
+deps = dbt-redshift~=1.7.0
+commands =
+    dbt clean
+    dbt deps
+    dbt build --target redshift --vars '"my_var": "my value"'
+
 # Spark integration test (disabled)
 [testenv:integration_spark]
 changedir = integration_test_project