[GitHub] [airflow] mik-laj commented on a change in pull request #8991: All classes in backport providers are now importable in Airflow 1.10

[GitBox <gi...@apache.org>]

mik-laj commented on a change in pull request #8991:
URL: https://github.com/apache/airflow/pull/8991#discussion_r429614304



##########
File path: airflow/providers/odbc/hooks/odbc.py
##########
@@ -24,7 +24,23 @@
 import pyodbc
 
 from airflow.hooks.dbapi_hook import DbApiHook
-from airflow.utils.helpers import merge_dicts
+
+
+# We do not import it from airflow.utils because merge_dicts is not available in Airflow 1.10
+# So this operator would not be backportable
+def merge_dicts(dict1, dict2):

Review comment:
       ``{**dict1, **dict2}`` only merges the first dictionary. This function also merges nested dictionaries. 
   ```
   >>> dict_a = {'A': {'B': {'C': 'D'}}}
   >>> dict_b = {'A': {'B': {'E': 'F'}}}
   >>> {**dict_a, **dict_b}
   {'A': {'B': {'E': 'F'}}}
   >>> merge_dicts(dict_a, dict_b)
   {'A': {'B': {'C': 'D', 'E': 'F'}}}
   ```




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