ASF GitHub Bot commented on AIRFLOW-1465:

stale[bot] commented on pull request #2550: [AIRFLOW-1465] Fix serialization 
error of chart data when X is Date
URL: https://github.com/apache/airflow/pull/2550
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> charts don't work when X is Date is checked
> -------------------------------------------
>                 Key: AIRFLOW-1465
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1465
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: ui
>    Affects Versions: 1.8.0
>            Reporter: Jiening Wen
>            Priority: Major
>              Labels: webapp
>         Attachments: chart error.PNG
> The example on 
> https://airflow.incubator.apache.org/profiling.html#chart-screenshot fails 
> with error message like {{1496268000000 is not JSON serializable}}.
> !chart error.PNG|thumbnail!
> It seems to be related to an upstream issue in pandas that Index.tolist 
> doesn't convert values to python native types.
> https://github.com/pandas-dev/pandas/issues/12715

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