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Posted to issues-all@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2019/03/28 18:54:00 UTC
[jira] [Commented] (IMPALA-8367) from_unixtime Bad date/time
conversion format: u on NULL value
[ https://issues.apache.org/jira/browse/IMPALA-8367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16804192#comment-16804192 ]
Tim Armstrong commented on IMPALA-8367:
---------------------------------------
This might be a good starter bugfix. This logic is in TimestampFunctions::UnixAndFromUnixPrepare() and TimestampFunctions::ToTimestamp(FunctionContext* context, const StringVal& date, const StringVal& fmt).
I agree that it would make sense to defer failing the query we encounter a non-NULL timestamp value.
> from_unixtime Bad date/time conversion format: u on NULL value
> --------------------------------------------------------------
>
> Key: IMPALA-8367
> URL: https://issues.apache.org/jira/browse/IMPALA-8367
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.11.0
> Environment: impalad version 2.11.0-cdh5.14.2 RELEASE (build ed85dce709da9557aeb28be89e8044947708876c) Built on Tue Mar 27 13:39:48 PDT 2018
> Reporter: Sergio Leoni
> Priority: Minor
> Labels: ramp-up
>
> The function
> {code:sql}
> from_unixtime(bigint unixtime[, string format]) {code}
> output error if the value of unixtime is NULL and format is 'u'.
>
> This doesn't work:
> {code:sql}
> SELECT FROM_UNIXTIME(NULL, 'u')
> {code}
> {noformat}
> Bad date/time conversion format: u{noformat}
>
> This works:
> {code:sql}
> SELECT FROM_UNIXTIME(NULL, 'yyyy-MM-dd')
> {code}
> {noformat}
> |from_unixtime(null, 'yyyy-mm-dd')|
> |---------------------------------|
> | NULL |
> |---------------------------------|{noformat}
>
> I haven't checked all the possible combinations.
> Other software like Hive handles this correctly.
>
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