[jira] [Commented] (AIRFLOW-1613) Make MySqlToGoogleCloudStorageOperator compaitible with python3

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-1613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16166995#comment-16166995 ] 

ASF subversion and git services commented on AIRFLOW-1613:
----------------------------------------------------------

Commit 9218a21672800252bd8ae5977431bf3ea5aad8e9 in incubator-airflow's branch refs/heads/master from [~joy.gao54]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-airflow.git;h=9218a21 ]

[AIRFLOW-1613] Make MySqlToGoogleCloudStorageOperator compaitible with python3

Closes #2609 from jgao54/make-MySqlToGoogleCloudStorageOperator-python3-compaitible


> Make MySqlToGoogleCloudStorageOperator compaitible with python3
> ---------------------------------------------------------------
>
>                 Key: AIRFLOW-1613
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1613
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: contrib
>            Reporter: Joy Gao
>
> 1. 
> In Python 3, map(...) returns an iterator, which can only be iterated over once. 
> Therefore the current implementation will return an empty list after the first iteration of schema:
> {code}
>         schema = map(lambda schema_tuple: schema_tuple[0], cursor.description)
>         file_no = 0
>         tmp_file_handle = NamedTemporaryFile(delete=True)
>         tmp_file_handles = {self.filename.format(file_no): tmp_file_handle}
>         for row in cursor:
>             # Convert datetime objects to utc seconds, and decimals to floats
>             row = map(self.convert_types, row)
>             row_dict = dict(zip(schema, row))
> {code}
> 2.
> File opened as binary, but string are written to it. Get error `a bytes-like object is required, not 'str'`. Use mode='w' instead.



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