ASF GitHub Bot commented on ARROW-1425:

ts-dpb commented on issue #1575: ARROW-1425: [Python] Document Arrow 
timestamps, and interops w/ other systems
URL: https://github.com/apache/arrow/pull/1575#issuecomment-364069670
   It was puzzling to the author and me where to place the new piece of
   documentation – we looked for a top-level doc directory but there was none.

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> [Python] Document semantic differences between Spark timestamps and Arrow 
> timestamps
> ------------------------------------------------------------------------------------
>                 Key: ARROW-1425
>                 URL: https://issues.apache.org/jira/browse/ARROW-1425
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Wes McKinney
>            Assignee: Heimir Thor Sverrisson
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.9.0
> The way that Spark treats non-timezone-aware timestamps as session local can 
> be problematic when using pyarrow which may view the data coming from 
> toPandas() as time zone naive (but with fields as though it were UTC, not 
> session local). We should document carefully how to properly handle the data 
> coming from Spark to avoid problems.
> cc [~bryanc] [~holdenkarau]

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