[GitHub] [airflow] turbaszek commented on a change in pull request #9054: Add MySqlToS3Operator

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

turbaszek commented on a change in pull request #9054:
URL: https://github.com/apache/airflow/pull/9054#discussion_r437208286



##########
File path: airflow/providers/amazon/aws/operators/mysql_to_s3.py
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@@ -0,0 +1,126 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import os
+import tempfile
+from typing import Optional, Union
+
+import numpy as np
+import pandas as pd
+
+from airflow.models import BaseOperator
+from airflow.providers.amazon.aws.hooks.s3 import S3Hook
+from airflow.providers.mysql.hooks.mysql import MySqlHook
+from airflow.utils.decorators import apply_defaults
+
+
+class MySQLToS3Operator(BaseOperator):
+    """
+    Saves data from an specific MySQL query into a file in S3.
+
+    :param query: the sql query to be executed. If you want to execute a file, place the absolute path of it,
+        ending with .sql extension.
+    :type query: str
+    :param s3_bucket: bucket where the data will be stored
+    :type s3_bucket: str
+    :param s3_key: desired key for the file. It includes the name of the file
+    :type s3_key: str
+    :param mysql_conn_id: reference to a specific mysql database
+    :type mysql_conn_id: str
+    :param aws_conn_id: reference to a specific S3 connection
+    :type aws_conn_id: str
+    :param verify: Whether or not to verify SSL certificates for S3 connection.
+        By default SSL certificates are verified.
+        You can provide the following values:
+
+        - ``False``: do not validate SSL certificates. SSL will still be used
+                (unless use_ssl is False), but SSL certificates will not be verified.
+        - ``path/to/cert/bundle.pem``: A filename of the CA cert bundle to uses.
+                You can specify this argument if you want to use a different
+                CA cert bundle than the one used by botocore.
+    :type verify: bool or str
+    :param pd_csv_kwargs: arguments to include in pd.to_csv (header, index, columns...)
+    :type pd_csv_kwargs: dict
+    :param index: whether to have the index or not in the dataframe
+    :type index: str
+    :param header: whether to include header or not into the S3 file
+    :type header: bool
+    """
+
+    template_fields = ('s3_key', 'query',)
+    template_ext = ('.sql',)
+
+    @apply_defaults
+    def __init__(
+            self,
+            query: str,
+            s3_bucket: str,
+            s3_key: str,
+            mysql_conn_id: str = 'mysql_default',
+            aws_conn_id: str = 'aws_default',
+            verify: Optional[Union[bool, str]] = None,
+            pd_csv_kwargs: dict = None,

Review comment:
       ```suggestion
               pd_csv_kwargs: Optional[dict] = None,
   ```
   As we use `None` as default value 




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