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From "Tenya Iida (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15079) Hive cannot read Parquet string timetamps as TIMESTAMP data type
Date Tue, 19 Sep 2017 13:56:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16171734#comment-16171734
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Tenya Iida commented on HIVE-15079:
-----------------------------------

Hi, is this issue still active or has it been fixed but become outdated? Thank you.

> Hive cannot read Parquet string timetamps as TIMESTAMP data type
> ----------------------------------------------------------------
>
>                 Key: HIVE-15079
>                 URL: https://issues.apache.org/jira/browse/HIVE-15079
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Sergio Peña
>            Assignee: Gabor Szadovszky
>
> The Hive Wiki for timestamps specifies that strings timestamps can be read by Hive. 
> https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-Timestamps
> {noformat}
> Supported conversions:
> Integer numeric types: Interpreted as UNIX timestamp in seconds
> Floating point numeric types: Interpreted as UNIX timestamp in seconds with decimal precision
> Strings: JDBC compliant java.sql.Timestamp format "YYYY-MM-DD HH:MM:SS.fffffffff" (9
decimal place precision)
> {noformat}
> This works fine with Text table formats, but when Parquet is used, then it throws the
following exception:
> {noformat}
> java.io.IOException: org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.ClassCastException:
org.apache.hadoop.io.Text cannot be cast to org.apache.hadoop.hive.serde2.io.TimestampWritable
> {noformat}
> How to reproduce
> {noformat}
> > create table t1 (id int, time string) stored as parquet;
> > insert into table t1 values (1,'2016-07-17 14:42:18');
> > alter table t1 replace columns (id int, time timestamp);
> > select * from t1
> {noformat}
> The above example will run fine if you use a TEXT format instead of PARQUET.
> This issue was raised on PARQUET-723



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