[jira] [Resolved] (SPARK-22010) Slow fromInternal conversion for TimestampType

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-22010.
----------------------------------
    Resolution: Won't Fix

> Slow fromInternal conversion for TimestampType
> ----------------------------------------------
>
>                 Key: SPARK-22010
>                 URL: https://issues.apache.org/jira/browse/SPARK-22010
>             Project: Spark
>          Issue Type: Sub-task
>          Components: PySpark
>    Affects Versions: 2.2.0
>            Reporter: Maciej Bryński
>            Priority: Minor
>         Attachments: profile_fact_dok.png
>
>
> To convert timestamp type to python we are using 
> {code}datetime.datetime.fromtimestamp(ts // 1000000).replace(microsecond=ts % 1000000){code}
> code.
> {code}
> In [34]: %%timeit
>     ...: datetime.datetime.fromtimestamp(1505383647).replace(microsecond=12344)
>     ...:
> 4.58 µs ± 558 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
> {code}
> It's slow, because:
> # we're trying to get TZ on every conversion
> # we're using replace method
> Proposed solution: custom datetime conversion and move calculation of TZ to module



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