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https://issues.apache.org/jira/browse/HIVE-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13701158#comment-13701158
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Jonathan Chang commented on HIVE-2333:
--------------------------------------
The key difference to protobuf is that the serdes should satisfy the Hive
contract. I'm not sure what the best way to express the contract is but
certainly if a serde does not support a certain condition, at the very least, a
warning needs to be shown.
> 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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