Support agate Integer type, test with empty seed

.changes/unreleased/Fixes-20231107-100905.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Support agate Integer type, test with empty seed
+time: 2023-11-07T10:09:05.723451-05:00
+custom:
+  Author: gshank
+  Issue: "1003"

dbt/adapters/bigquery/impl.py

@@ -324,6 +324,10 @@ def convert_number_type(cls, agate_table: agate.Table, col_idx: int) -> str:
         decimals = agate_table.aggregate(agate.MaxPrecision(col_idx))  # type: ignore[attr-defined]
         return "float64" if decimals else "int64"
 
+    @classmethod
+    def convert_integer_type(cls, agate_table: agate.Table, col_idx: int) -> str:
+        return "int64"
+
     @classmethod
     def convert_boolean_type(cls, agate_table: agate.Table, col_idx: int) -> str:
         return "bool"

tests/functional/adapter/test_simple_seed.py

@@ -2,6 +2,7 @@
 from dbt.tests.adapter.simple_seed.fixtures import macros__schema_test
 from dbt.tests.adapter.simple_seed.seeds import seeds__enabled_in_config_csv, seeds__tricky_csv
 from dbt.tests.adapter.simple_seed.test_seed import SeedConfigBase
+from dbt.tests.adapter.simple_seed.test_seed import BaseTestEmptySeed
 from dbt.tests.adapter.utils.base_utils import run_dbt
 
 
@@ -151,3 +152,7 @@ def test__bigquery_seed_table_with_labels_config_bigquery(self, project):
             assert bq_table.labels
             assert bq_table.labels == self.table_labels()
             assert bq_table.expires
+
+
+class TestBigQueryEmptySeed(BaseTestEmptySeed):
+    pass

tests/unit/mock_adapter.py

@@ -55,6 +55,9 @@ def convert_text_type(self, *args, **kwargs):
         def convert_number_type(self, *args, **kwargs):
             return self.responder.convert_number_type(*args, **kwargs)
 
+        def convert_integer_type(self, *args, **kwargs):
+            return self.responder.convert_integer_type(*args, **kwargs)
+
         def convert_boolean_type(self, *args, **kwargs):
             return self.responder.convert_boolean_type(*args, **kwargs)