[GitHub] [airflow] turbaszek commented on a change in pull request #14415: SnowflakeToS3Operator

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

turbaszek commented on a change in pull request #14415:
URL: https://github.com/apache/airflow/pull/14415#discussion_r582219056



##########
File path: airflow/providers/amazon/aws/transfers/snowflake_to_s3.py
##########
@@ -0,0 +1,150 @@
+#
+# 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.
+"""Transfers data from Snowflake into a S3 Bucket."""
+from typing import List, Optional
+
+from airflow.models import BaseOperator
+from airflow.providers.snowflake.hooks.snowflake import SnowflakeHook
+from airflow.utils.decorators import apply_defaults
+
+
+class SnowflakeToS3Operator(BaseOperator):
+    """
+    UNLOAD a query or a table from Snowflake to S3. It is not necessary a conn to S3 because
+    Snowflake handles it. You have to follow one of the setups in:
+    https://docs.snowflake.com/en/user-guide/data-load-s3-config.html
+
+    :param stage: Reference to a specific Snowflake stage to copy the data into it. This allows you to use
+        the method 'Configuring AWS IAM User Credentials' for unloading data to s3. If this is passed,
+        s3_bucket can't be used and file_format is not necessary
+    :type stage: str
+    :param warehouse: reference to a specific snowflake warehouse to override the one in the conn
+    :type warehouse: str
+    :param database: reference to a specific snowflake database to override the one in the conn
+    :type warehouse: str
+    :param s3_bucket: reference to a specific S3 bucket where the data will be saved. For using it, you
+        should have done the one-time setup 'Configuring a Snowflake Storage Integration'
+    :type s3_bucket: str
+    :param s3_key: reference to a specific S3 key within a bucket or stage.
+    :type s3_key: str
+    :param file_format: can be either a previous file format created in Snowflake
+        or hardcoded one like ``type = csv field_delimiter = ',' skip_header = 1``
+    :type file_format: str
+    :param query_or_table: query or full table to unload. If table, it must include the schema like
+        `schema.table`
+    :type query_or_table: str
+    :param snowflake_conn_id: reference to a specific snowflake connection
+    :type snowflake_conn_id: str
+    :param unload_options: reference to a list of UNLOAD options (SINGLE, MAX_FILE_SIZE,
+        OVERWRITE etc). Each element of the list has to be a string
+    :type unload_options: list
+    :param role: name of role (will overwrite any role defined in
+        connection's extra JSON)
+    :type role: str
+    :param authenticator: authenticator for Snowflake.
+        'snowflake' (default) to use the internal Snowflake authenticator
+        'externalbrowser' to authenticate using your web browser and
+        Okta, ADFS or any other SAML 2.0-compliant identify provider
+        (IdP) that has been defined for your account
+        'https://<your_okta_account_name>.okta.com' to authenticate
+        through native Okta.
+    :type authenticator: str
+    :param session_parameters: You can set session-level parameters at
+        the time you connect to Snowflake
+    :type session_parameters: dict
+    """
+
+    template_fields = (
+        's3_key',
+        's3_bucket',
+        'table_or_query',
+        'snowflake_conn_id',
+    )
+    template_ext = ('.sql',)
+    ui_color = '#ffebb2'
+
+    @apply_defaults
+    def __init__(
+        self,
+        *,
+        stage: Optional[str] = None,
+        s3_bucket: Optional[str],

Review comment:
       If this is optional should it have default value of `None`?




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