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https://issues.apache.org/jira/browse/HIVE-3844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809688#comment-13809688
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Venki Korukanti commented on HIVE-3844:
---------------------------------------

Hi [~mgrover], Here is the initial patch https://reviews.apache.org/r/15105/. 
It covers the three formats mentioned [here | 
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-Timestamps].
 Please review it and provide feedback. 

> Unix timestamps don't seem to be read correctly from HDFS as Timestamp column
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-3844
>                 URL: https://issues.apache.org/jira/browse/HIVE-3844
>             Project: Hive
>          Issue Type: Bug
>          Components: Serializers/Deserializers
>    Affects Versions: 0.8.0
>            Reporter: Mark Grover
>            Assignee: Venki Korukanti
>
> Serega Shepak pointed out that something like
> {code}
> select cast(date_occurrence as timestamp) from xvlr_data limit 10
> {code}
> where  date_occurrence has BIGINT type (timestamp in milliseconds) works. But 
> it doesn't work if the declared type is TIMESTAMP on column. The data in the 
> date_occurence column in unix timestamp in millis.



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