consolidate timestamp macros (#273)

* consolidate timestamp macros

* add testing changes

* deleting extra timestamps.sql

* changie entry

* fix backcompat

* Update Breaking Changes-20220923-112314.yaml

* Update dev-requirements.txt

* remove current_timestamp_in_utc

* fix backcompat

* change test import

* fix BaseCurrentTimestamps import

* update dev-requirements

* Update change log body

* fix changie log

.changes/unreleased/Feature-20220923-112314.yaml

@@ -0,0 +1,7 @@
+kind: Feature
+body: Migrate dbt-utils current_timestamp macros into core + adapters
+time: 2022-09-23T11:23:14.312738-07:00
+custom:
+  Author: colin-rogers-dbt
+  Issue: "276"
+  PR: "273"

dbt/include/snowflake/macros/adapters.sql

@@ -161,21 +161,6 @@
   {{ return(load_result('check_schema_exists').table) }}
 {%- endmacro %}
 
-{% macro snowflake__current_timestamp() -%}
-  convert_timezone('UTC', current_timestamp())
-{%- endmacro %}
-
-
-{% macro snowflake__snapshot_string_as_time(timestamp) -%}
-    {%- set result = "to_timestamp_ntz('" ~ timestamp ~ "')" -%}
-    {{ return(result) }}
-{%- endmacro %}
-
-
-{% macro snowflake__snapshot_get_time() -%}
-  to_timestamp_ntz({{ current_timestamp() }})
-{%- endmacro %}
-
 
 {% macro snowflake__rename_relation(from_relation, to_relation) -%}
   {% call statement('rename_relation') -%}

dbt/include/snowflake/macros/utils/timestamps.sql

@@ -0,0 +1,20 @@
+{% macro snowflake__current_timestamp() -%}
+  convert_timezone('UTC', current_timestamp())
+{%- endmacro %}
+
+{% macro snowflake__snapshot_string_as_time(timestamp) -%}
+  {%- set result = "to_timestamp_ntz('" ~ timestamp ~ "')" -%}
+  {{ return(result) }}
+{%- endmacro %}
+
+{% macro snowflake__snapshot_get_time() -%}
+  to_timestamp_ntz({{ current_timestamp() }})
+{%- endmacro %}
+
+{% macro snowflake__current_timestamp_backcompat() %}
+  current_timestamp::{{ type_timestamp() }}
+{% endmacro %}
+
+{% macro snowflake__current_timestamp_in_utc_backcompat() %}
+  convert_timezone('UTC', {{ snowflake__current_timestamp_backcompat() }})::{{ type_timestamp() }}
+{% endmacro %}

tests/functional/adapter/test_timestamps.py

@@ -0,0 +1,31 @@
+import imp
+import pytest
+from dbt.tests.adapter.utils.test_timestamps import BaseCurrentTimestamps
+
+_MODEL_CURRENT_TIMESTAMP = """
+SELECT {{current_timestamp()}} as current_timestamp,
+       {{current_timestamp_in_utc_backcompat()}} as current_timestamp_in_utc_backcompat,
+       {{current_timestamp_backcompat()}} as current_timestamp_backcompat
+"""
+
+
+class TestCurrentTimestampSnowflake(BaseCurrentTimestamps):
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {"get_current_timestamp.sql": _MODEL_CURRENT_TIMESTAMP}
+
+    @pytest.fixture(scope="class")
+    def expected_schema(self):
+        return {
+                "CURRENT_TIMESTAMP": "TIMESTAMP_TZ",
+                "CURRENT_TIMESTAMP_IN_UTC_BACKCOMPAT": "TIMESTAMP_NTZ",
+                "CURRENT_TIMESTAMP_BACKCOMPAT": "TIMESTAMP_NTZ",
+            }
+
+    @pytest.fixture(scope="class")
+    def expected_sql(self):
+        return """
+                select convert_timezone('UTC', current_timestamp()) as current_timestamp,
+                       convert_timezone('UTC', current_timestamp::TIMESTAMP)::TIMESTAMP as current_timestamp_in_utc_backcompat,
+                       current_timestamp::TIMESTAMP as current_timestamp_backcompat
+                """