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https://issues.apache.org/jira/browse/HIVE-15079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16171748#comment-16171748
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Gabor Szadovszky commented on HIVE-15079:
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Hi, [~kam338uk]. Unfortunately, I don't have time to work on Hive anymore. I
don't think it's fixed. Feel free to contribute ;)
> 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
>
> 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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