Fix test failures (#217)

### Summary

Tests were failing due to changes to dremio and updating fetch in our
adapter.

### Description

Modified a utility method provided by dbt-core to fetch test results as
they're required in some cases. Also changed the error message returned
by invalid grants.

### Test Results

All tests ran

### Changelog

N/A

dbt/adapters/dremio/impl.py

@@ -138,6 +138,29 @@ def standardize_grants_dict(self, grants_table: agate.Table) -> dict:
                 grants_dict.update({privilege: [grantee]})
         return grants_dict
 
+    # This is for use in the test suite
+    # Need to override to add fetch to the execute method
+    def run_sql_for_tests(self, sql, fetch, conn):
+        cursor = conn.handle.cursor()
+        try:
+            cursor.execute(sql, None, True)
+            if hasattr(conn.handle, "commit"):
+                conn.handle.commit()
+            if fetch == "one":
+                return cursor.fetchone()
+            elif fetch == "all":
+                return cursor.fetchall()
+            else:
+                return
+        except BaseException as e:
+            if conn.handle and not getattr(conn.handle, "closed", True):
+                conn.handle.rollback()
+            print(sql)
+            print(e)
+            raise
+        finally:
+            conn.transaction_open = False
+
 
 COLUMNS_EQUAL_SQL = """
 with diff_count as (

tests/functional/adapter/basic/test_base_mat.py

@@ -96,7 +96,6 @@ def dbt_profile_data(
         return profile
 
     def test_base(self, project):
-
         # seed command
         results = run_dbt(["seed"])
         # seed result length

tests/functional/adapter/dremio_specific/test_schema_parsing.py

@@ -32,7 +32,7 @@ def update_config_file(self, updates, *paths):
 
     def test_schema_with_dots(self, project):
         self.update_config_file(
-            {"object_storage_path": 'dbtdremios3."test.dot"'},
+            {"object_storage_path": 'dbtdremios3."test.schema"'},
             project.profiles_dir,
             "profiles.yml",
         )

tests/functional/adapter/grants/test_invalid_grants.py

@@ -21,7 +21,7 @@
 
 class TestInvalidGrantsDremio(BaseGrantsDremio, BaseInvalidGrants):
     def grantee_does_not_exist_error(self):
-        return "StatusRuntimeException: INTERNAL"
+        return "Grant on catalog entity failed. User invalid_user does not exist."
 
     def privilege_does_not_exist_error(self):
         return 'Encountered "fake_privilege"'