[jira] [Commented] (AIRFLOW-5542) Export a BigQuery query result to GCS

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-5542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16936108#comment-16936108 ] 

ASF GitHub Bot commented on AIRFLOW-5542:
-----------------------------------------

meftasadat commented on pull request #6173: [AIRFLOW-5542] Added BQ query results export to GCS  operator
URL: https://github.com/apache/airflow/pull/6173
 
 
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   ### Jira
   
   - [ ] My PR addresses the following AIRFLOW-5542 (https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. 
     - https://issues.apache.org/jira/browse/AIRFLOW-5522
   
   ### Description
   
   - Executes a BigQuery Standard SQL query and exports query results to GCS.
   
   ### Tests
   
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   ### Commits
   
   - [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [ ] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
 
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> Export a BigQuery query result to GCS
> -------------------------------------
>
>                 Key: AIRFLOW-5542
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-5542
>             Project: Apache Airflow
>          Issue Type: New Feature
>          Components: operators
>    Affects Versions: 1.10.5
>            Reporter: Mefta Sadat
>            Priority: Minor
>
> h2. Problem
> There is currently no direct operator to export a BQ query result dataset to GCS.
> h2. Proposed implementation
> This problem can be solved by creating a temporary table, storing the query results in the temp table, exporting the table to GCS and then finally deleting the table
> The following methods in airflow.gcp.hooks.bigquery_hook can be leveraged to achieve this solution:
> create_empty_dataset -> run_query -> run_extract -> run_table_delete -> delete_dataset
> The proposer operator is just a wrapper around these methods. It executes the above-mentioned methods in the necessary order and handles any exceptions that may occur.



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