[jira] [Updated] (HIVE-2333) LazySimpleSerDe does not properly handle arrays / escape control characters

["Adam Kramer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Kramer updated HIVE-2333:
------------------------------

    Priority: Critical  (was: Major)

> LazySimpleSerDe does not properly handle arrays / escape control characters
> ---------------------------------------------------------------------------
>
>                 Key: HIVE-2333
>                 URL: https://issues.apache.org/jira/browse/HIVE-2333
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Jonathan Chang
>            Priority: Critical
>
> LazySimpleSerDe, the default SerDe for Hive is severely broken:
> * Empty arrays are serialized as an empty string. Hence an array(array()) is indistinguishable from array(array(array())) from array().
> * Similarly, empty strings are serialized as an empty string. Hence array('') is also indistinguishable from an empty array.
> * if the serialized string equals the null sequence, then it is ambiguous as to whether it is an array with a single null element or a null array.
> It also does not do well with control characters:
> > select array('foo\002bar') from tmp;
> ...
> ["foo","bar"]
> > select array('foo\001bar') from tmp;
> ...
> ["foo"]

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