Fix: Cast to timestamp prior to event time comparison

.changes/unreleased/Fixes-20241204-105846.yaml

@@ -0,0 +1,7 @@
+kind: Fixes
+body: Cast `event_time` to a timestamp prior to comparing against microbatch start/end
+  time
+time: 2024-12-04T10:58:46.573608-05:00
+custom:
+  Author: michelleark
+  Issue: "1422"

dbt/adapters/bigquery/relation.py

@@ -4,7 +4,12 @@
 
 from dbt_common.exceptions import CompilationError
 from dbt_common.utils.dict import filter_null_values
-from dbt.adapters.base.relation import BaseRelation, ComponentName, InformationSchema
+from dbt.adapters.base.relation import (
+    BaseRelation,
+    ComponentName,
+    InformationSchema,
+    EventTimeFilter,
+)
 from dbt.adapters.contracts.relation import RelationConfig, RelationType
 from dbt.adapters.relation_configs import RelationConfigChangeAction
 
@@ -116,6 +121,24 @@ def materialized_view_config_changeset(
     def information_schema(self, identifier: Optional[str] = None) -> "BigQueryInformationSchema":
         return BigQueryInformationSchema.from_relation(self, identifier)
 
+    def _render_event_time_filtered(self, event_time_filter: EventTimeFilter) -> str:
+        """
+        Returns "" if start and end are both None
+        """
+        filter = ""
+        if event_time_filter.start and event_time_filter.end:
+            filter = f"cast({event_time_filter.field_name} as timestamp) >= '{event_time_filter.start}' and cast({event_time_filter.field_name} as timestamp) < '{event_time_filter.end}'"
+        elif event_time_filter.start:
+            filter = (
+                f"cast({event_time_filter.field_name} as timestamp) >= '{event_time_filter.start}'"
+            )
+        elif event_time_filter.end:
+            filter = (
+                f"cast({event_time_filter.field_name} as timestamp) < '{event_time_filter.end}'"
+            )
+
+        return filter
+
 
 @dataclass(frozen=True, eq=False, repr=False)
 class BigQueryInformationSchema(InformationSchema):

tests/functional/adapter/incremental/incremental_strategy_fixtures.py

@@ -570,7 +570,7 @@
     begin=modules.datetime.datetime(2020, 1, 1, 0, 0, 0)
     )
 }}
-select * from {{ ref('input_model') }}
+select id, cast(event_time as timestamp) as event_time from {{ ref('input_model') }}
 """
 
 microbatch_input_sql = """
@@ -582,6 +582,24 @@
 select 3 as id, TIMESTAMP '2020-01-03 00:00:00-0' as event_time
 """
 
+microbatch_input_event_time_date_sql = """
+{{ config(materialized='table', event_time='event_time') }}
+select 1 as id, DATE '2020-01-01' as event_time
+union all
+select 2 as id, DATE '2020-01-02' as event_time
+union all
+select 3 as id, DATE '2020-01-03' as event_time
+"""
+
+microbatch_input_event_time_datetime_sql = """
+{{ config(materialized='table', event_time='event_time') }}
+select 1 as id, DATETIME '2020-01-01' as event_time
+union all
+select 2 as id, DATETIME '2020-01-02' as event_time
+union all
+select 3 as id, DATETIME '2020-01-03' as event_time
+"""
+
 microbatch_model_no_partition_by_sql = """
 {{ config(
     materialized='incremental',

tests/functional/adapter/incremental/test_incremental_microbatch.py

@@ -13,6 +13,8 @@
     microbatch_input_sql,
     microbatch_model_no_partition_by_sql,
     microbatch_model_invalid_partition_by_sql,
+    microbatch_input_event_time_date_sql,
+    microbatch_input_event_time_datetime_sql,
 )
 
 
@@ -22,6 +24,32 @@ def microbatch_model_sql(self) -> str:
         return microbatch_model_no_unique_id_sql
 
 
+class TestBigQueryMicrobatchInputWithDate(TestBigQueryMicrobatch):
+    @pytest.fixture(scope="class")
+    def input_model_sql(self) -> str:
+        return microbatch_input_event_time_date_sql
+
+    @pytest.fixture(scope="class")
+    def insert_two_rows_sql(self, project) -> str:
+        test_schema_relation = project.adapter.Relation.create(
+            database=project.database, schema=project.test_schema
+        )
+        return f"insert into {test_schema_relation}.input_model (id, event_time) values (4, DATE '2020-01-04'), (5, DATE '2020-01-05')"
+
+
+class TestBigQueryMicrobatchInputWithDatetime(TestBigQueryMicrobatch):
+    @pytest.fixture(scope="class")
+    def input_model_sql(self) -> str:
+        return microbatch_input_event_time_datetime_sql
+
+    @pytest.fixture(scope="class")
+    def insert_two_rows_sql(self, project) -> str:
+        test_schema_relation = project.adapter.Relation.create(
+            database=project.database, schema=project.test_schema
+        )
+        return f"insert into {test_schema_relation}.input_model (id, event_time) values (4, DATETIME '2020-01-04'), (5, DATETIME '2020-01-05')"
+
+
 class TestBigQueryMicrobatchMissingPartitionBy:
     @pytest.fixture(scope="class")
     def models(self) -> str:
@@ -30,7 +58,6 @@ def models(self) -> str:
             "input_model.sql": microbatch_input_sql,
         }
 
-    @mock.patch.dict(os.environ, {"DBT_EXPERIMENTAL_MICROBATCH": "True"})
     def test_execution_failure_no_partition_by(self, project):
         with patch_microbatch_end_time("2020-01-03 13:57:00"):
             _, stdout = run_dbt_and_capture(["run"], expect_pass=False)
@@ -45,7 +72,6 @@ def models(self) -> str:
             "input_model.sql": microbatch_input_sql,
         }
 
-    @mock.patch.dict(os.environ, {"DBT_EXPERIMENTAL_MICROBATCH": "True"})
     def test_execution_failure_no_partition_by(self, project):
         with patch_microbatch_end_time("2020-01-03 13:57:00"):
             _, stdout = run_dbt_and_capture(["run"], expect_pass=False)