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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8970) Allow custom time_format on cqlsh COPY TO
Date Fri, 02 Oct 2015 21:50:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941828#comment-14941828
] 

Aleksey Yeschenko commented on CASSANDRA-8970:
----------------------------------------------

[~thobbs] [~carlyeks] can either of you have a look at rebasing the patch/seeing if it's still
relevant? Thank you.

> Allow custom time_format on cqlsh COPY TO
> -----------------------------------------
>
>                 Key: CASSANDRA-8970
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8970
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Aaron Ploetz
>            Priority: Trivial
>              Labels: cqlsh
>             Fix For: 2.1.x
>
>         Attachments: CASSANDRA-8970.patch
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> When executing a COPY TO from cqlsh, the user is currently has no control over the format
of exported timestamp columns.  If the user has indicated a {{time_format}} in their cqlshrc
file, that format will be used.  Otherwise, the system default format will be used.
> The problem comes into play when the timestamp format used on a COPY TO, is not valid
when the data is sent back into Cassandra with a COPY FROM.
> For instance, if a user has {{time_format = %Y-%m-%d %H:%M:%S%Z}} specified in their
cqlshrc, COPY TO will format timestamp columns like this:
> {{userid|posttime|postcontent}}
> {{0|2015-03-14 14:59:00CDT|rtyeryerweh}}
> {{0|2015-03-14 14:58:00CDT|sdfsdfsdgfjdsgojr}}
> {{0|2015-03-12 14:27:00CDT|sdgfjdsgojr}}
> Executing a COPY FROM on that same file will produce an "unable to coerce to formatted
date(long)" error.
> Right now, the only way to change the way timestamps are formatted is to exit cqlsh,
modify the {{time_format}} property in cqlshrc, and restart cqlsh.  The ability to specify
a COPY option of TIME_FORMAT with a Python strftime format, would allow the user to quickly
alter the timestamp format for export, without reconfiguring cqlsh.
> {{aploetz@cqlsh:stackoverflow> COPY posts1 TO '/home/aploetz/posts1.csv' WITH DELIMITER='|'
AND HEADER=true AND TIME_FORMAT='%Y-%m-%d %H:%M:%S%z;}}



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