consolidate timestamps (#323) (#334)

* update retry settings

* changelog entry

* consolidate timestamps

* add changie

* whitespace fix

* fix macro name

* update expected test fixture

* Update Features-20220926-105700.yaml

* add backcompat to test fixture

* add backcompat

* update dev-requirements

* Update change log body

* update test class name

* lowercase timestamps

(cherry picked from commit 86d5dbe)

Co-authored-by: colin-rogers-dbt <[email protected]>

.changes/unreleased/Features-20220926-105700.yaml

@@ -0,0 +1,7 @@
+kind: Features
+body: Migrate dbt-utils current_timestamp macros into core + adapters
+time: 2022-09-26T10:57:00.942765-07:00
+custom:
+  Author: colin-rogers-dbt
+  Issue: "324"
+  PR: "323"

dbt/include/bigquery/macros/adapters.sql

@@ -109,17 +109,6 @@
 {%- endmacro %}
 
 
-{% macro bigquery__current_timestamp() -%}
-  CURRENT_TIMESTAMP()
-{%- endmacro %}
-
-
-{% macro bigquery__snapshot_string_as_time(timestamp) -%}
-    {%- set result = 'TIMESTAMP("' ~ timestamp ~ '")' -%}
-    {{ return(result) }}
-{%- endmacro %}
-
-
 {% macro bigquery__list_schemas(database) -%}
   {{ return(adapter.list_schemas(database)) }}
 {% endmacro %}

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

@@ -0,0 +1,12 @@
+{% macro bigquery__current_timestamp() -%}
+  current_timestamp()
+{%- endmacro %}
+
+{% macro bigquery__snapshot_string_as_time(timestamp) -%}
+    {%- set result = 'TIMESTAMP("' ~ timestamp ~ '")' -%}
+    {{ return(result) }}
+{%- endmacro %}
+
+{% macro bigquery__current_timestamp_backcompat() -%}
+  current_timestamp
+{%- endmacro %}

tests/functional/adapter/utils/test_timestamps.py

@@ -0,0 +1,18 @@
+import pytest
+from dbt.tests.adapter.utils.test_timestamps import BaseCurrentTimestamps
+
+
+class TestCurrentTimestampBigQuery(BaseCurrentTimestamps):
+    @pytest.fixture(scope="class")
+    def expected_schema(self):
+        return {
+            "current_timestamp": "TIMESTAMP",
+            "current_timestamp_in_utc_backcompat": "TIMESTAMP",
+            "current_timestamp_backcompat": "TIMESTAMP",
+        }
+
+    @pytest.fixture(scope="class")
+    def expected_sql(self):
+        return """select current_timestamp() as current_timestamp,
+                current_timestamp as current_timestamp_in_utc_backcompat,
+                current_timestamp as current_timestamp_backcompat"""