[GitHub] [airflow] subkanthi commented on a change in pull request #15422: Subkanthi/bigquery mssql operator 15145

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

subkanthi commented on a change in pull request #15422:
URL: https://github.com/apache/airflow/pull/15422#discussion_r619816092



##########
File path: airflow/providers/google/cloud/transfers/bigquery_to_mssql.py
##########
@@ -0,0 +1,167 @@
+#
+# 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.
+"""This module contains Google BigQuery to MSSQL operator."""
+from typing import Optional, Sequence, Union
+
+from airflow.models import BaseOperator
+from airflow.providers.google.cloud.hooks.bigquery import BigQueryHook
+from airflow.providers.microsoft.mssql.hooks.mssql import MsSqlHook
+from airflow.utils.decorators import apply_defaults
+
+
+class BigQueryToMsSqlOperator(BaseOperator):
+    """
+    Fetches the data from a BigQuery table (alternatively fetch data for selected columns)
+    and insert that data into a MSSQL table.
+
+
+    .. note::
+        If you pass fields to ``selected_fields`` which are in different order than the
+        order of columns already in
+        BQ table, the data will still be in the order of BQ table.
+        For example if the BQ table has 3 columns as
+        ``[A,B,C]`` and you pass 'B,A' in the ``selected_fields``
+        the data would still be of the form ``'A,B'`` and passed through this form
+        to MSSQL
+
+    **Example**: ::
+
+       transfer_data = BigQueryToMsSqlOperator(
+            task_id='task_id',
+            dataset_table='origin_bq_table',
+            mssql_table='dest_table_name',
+            replace=True,
+        )
+
+    :param dataset_table: A dotted ``<dataset>.<table>``: the big query table of origin
+    :type dataset_table: str
+    :param selected_fields: List of fields to return (comma-separated). If
+        unspecified, all fields are returned.
+    :type selected_fields: str
+    :param gcp_conn_id: reference to a specific Google Cloud hook.
+    :type gcp_conn_id: str
+    :param delegate_to: The account to impersonate using domain-wide delegation of authority,
+        if any. For this to work, the service account making the request must have
+        domain-wide delegation enabled.
+    :type delegate_to: str
+    :param mssql_conn_id: reference to a specific mssql hook
+    :type mssql_conn_id: str
+    :param database: name of database which overwrite defined one in connection
+    :type database: str
+    :param replace: Whether to replace instead of insert
+    :type replace: bool
+    :param batch_size: The number of rows to take in each batch
+    :type batch_size: int
+    :param location: The location used for the operation.
+    :type location: str
+    :param impersonation_chain: Optional service account to impersonate using short-term
+        credentials, or chained list of accounts required to get the access_token
+        of the last account in the list, which will be impersonated in the request.
+        If set as a string, the account must grant the originating account
+        the Service Account Token Creator IAM role.
+        If set as a sequence, the identities from the list must grant
+        Service Account Token Creator IAM role to the directly preceding identity, with first
+        account from the list granting this role to the originating account (templated).
+    :type impersonation_chain: Union[str, Sequence[str]]
+    """
+
+    template_fields = (
+        'dataset_id',
+        'table_id',
+        'mssql_table',
+        'impersonation_chain',
+    )
+
+    @apply_defaults
+    def __init__(
+        self,
+        *,  # pylint: disable=too-many-arguments
+        dataset_table: str,
+        mssql_table: str,
+        selected_fields: Optional[str] = None,
+        gcp_conn_id: str = 'google_cloud_default',
+        mssql_conn_id: str = 'mssql_default',
+        database: Optional[str] = None,
+        delegate_to: Optional[str] = None,
+        replace: bool = False,
+        batch_size: int = 1000,
+        location: Optional[str] = None,
+        impersonation_chain: Optional[Union[str, Sequence[str]]] = None,
+        **kwargs,
+    ) -> None:
+        super().__init__(**kwargs)
+        self.selected_fields = selected_fields
+        self.gcp_conn_id = gcp_conn_id
+        self.mssql_conn_id = mssql_conn_id
+        self.database = database
+        self.mssql_table = mssql_table
+        self.replace = replace
+        self.delegate_to = delegate_to
+        self.batch_size = batch_size
+        self.location = location
+        self.impersonation_chain = impersonation_chain
+        try:
+            self.dataset_id, self.table_id = dataset_table.split('.')

Review comment:
       Thanks, let me check that.




-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org