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https://issues.apache.org/jira/browse/IMPALA-1503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-1503.
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Resolution: Duplicate
> Impala's date_sub and date_add functions are not automatically casting
> strings (in the correct format) to TIMESTAMP
> -------------------------------------------------------------------------------------------------------------------
>
> Key: IMPALA-1503
> URL: https://issues.apache.org/jira/browse/IMPALA-1503
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 2.0
> Reporter: Alex Spencer
> Assignee: Tim Armstrong
> Priority: Minor
> Labels: planner, timestamp
>
> To reproduce:
> -- This query works:
> select date_sub(now(), interval 5 minutes);
> -- Get the string version of now and copy and place it below:
> select now() as now;
> -- Paste in string and run this, Impala will error:
> select date_sub('2014-11-21 15:49:05.312610000', interval 5 minutes);
> -- It should not error, but rather cast the string (as per the documentation:
> http://www.cloudera.com/content/cloudera/en/documentation/cloudera-impala/latest/topics/impala_timestamp.html?scroll=timestamp
> ****The first argument can be a string, which is automatically cast to
> TIMESTAMP if it uses the recognized format, as described in TIMESTAMP Data
> Type.****
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