consolidate timestamps (#191)

* consolidate timestamps

* add changie and update reqs

* fix whitespace

* fix utc macro

* Update Under the Hood-20220926-101606.yaml

* fix base test class import

* add backcompat to fixture

* add utc backcompat

* remove cruft in timestamps

* add backcompat back

* remove duplicate snapshot macro

* whitespace fix

* fix backcompat macro

* add redshift__current_timestamp_backcompat

* fix test naming and import

* fix base test class import

* update dev-requirements

* Update change log body

.changes/unreleased/Under the Hood-20220926-101606.yaml

@@ -0,0 +1,7 @@
+kind: Features
+body: Migrate dbt-utils current_timestamp macros into core + adapters
+time: 2022-09-26T10:16:06.676737-07:00
+custom:
+  Author: colin-rogers-dbt
+  Issue: "194"
+  PR: "191"

dbt/include/redshift/macros/adapters.sql

@@ -216,20 +216,6 @@
   {{ return(postgres__check_schema_exists(information_schema, schema)) }}
 {%- endmacro %}
 
-{% macro redshift__current_timestamp() -%}
-  getdate()
-{%- endmacro %}
-
-{% macro redshift__snapshot_get_time() -%}
-  {{ current_timestamp() }}::timestamp
-{%- endmacro %}
-
-
-{% macro redshift__snapshot_string_as_time(timestamp) -%}
-    {%- set result = "'" ~ timestamp ~ "'::timestamp" -%}
-    {{ return(result) }}
-{%- endmacro %}
-
 
 {% macro redshift__persist_docs(relation, model, for_relation, for_columns) -%}
   {% if for_relation and config.persist_relation_docs() and model.description %}

dbt/include/redshift/macros/timestamps.sql

@@ -0,0 +1,20 @@
+{% macro redshift__current_timestamp() -%}
+    getdate()
+{%- endmacro %}
+
+{% macro redshift__snapshot_get_time() -%}
+    {{ current_timestamp() }}::timestamp
+{%- endmacro %}
+
+{% macro redshift__snapshot_string_as_time(timestamp) -%}
+    {%- set result = "'" ~ timestamp ~ "'::timestamp" -%}
+    {{ return(result) }}
+{%- endmacro %}
+
+{% macro redshift__current_timestamp_backcompat() -%}
+    getdate()
+{%- endmacro %}
+
+{% macro redshift__current_timestamp_in_utc_backcompat() -%}
+    getdate()
+{%- endmacro %}

tests/functional/adapter/utils/test_timestamps.py

@@ -0,0 +1,20 @@
+import pytest
+from dbt.tests.adapter.utils.test_timestamps import BaseCurrentTimestamps
+
+
+class TestCurrentTimestampRedshift(BaseCurrentTimestamps):
+    @pytest.fixture(scope="class")
+    def expected_schema(self):
+        return {
+            "current_timestamp": "timestamp without time zone",
+            "current_timestamp_in_utc_backcompat": "timestamp without time zone",
+            "current_timestamp_backcompat": "timestamp without time zone",
+        }
+
+    @pytest.fixture(scope="class")
+    def expected_sql(self):
+        return """
+                select getdate() as current_timestamp,
+                       getdate() as current_timestamp_in_utc_backcompat,
+                       getdate() as current_timestamp_backcompat
+                """