Ensure that schema and Table columns align

parsons/google/google_bigquery.py

@@ -775,6 +775,20 @@ def copy(
             else:
                 job_config.schema = self._generate_schema_from_parsons_table(tbl)
 
+        # Reorder schema to match table to ensure compatibility
+        schema = []
+        for column in tbl.columns:
+            try:
+                schema_row = [
+                    i for i in job_config.schema if i.name.lower() == column.lower()
+                ][0]
+            except IndexError:
+                raise IndexError(
+                    f"Column found in Table that was not found in schema: {column}"
+                )
+            schema.append(schema_row)
+        job_config.schema = schema
+
         gcs_client = gcs_client or GoogleCloudStorage()
         temp_blob_name = f"{uuid.uuid4()}.csv"
         temp_blob_uri = gcs_client.upload_table(tbl, tmp_gcs_bucket, temp_blob_name)

test/test_databases/test_bigquery.py

@@ -396,9 +396,7 @@ def test_copy__if_exists_passed_through(self):
         bq = self._build_mock_client_for_copying(table_exists=False)
         bq.copy_from_gcs = mock.MagicMock()
         table_name = "dataset.table"
-        if_exists = "append"
-        bq.client.get_table = lambda _: mock.MagicMock()
-        bq.client.get_table.return_value = None
+        if_exists = "drop"
 
         # call the method being tested
         bq.copy(