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https://issues.apache.org/jira/browse/HIVE-5206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758212#comment-13758212
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Jason Dere commented on HIVE-5206:
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Correction - the justification is for decimal, char, varchar, so for a 
combination of string/numeric types. The "right" way depends on whether the 
type is a qualified type and requires parameters. 

Not going to indulge the "what if" fantasies here, but would like to point out 
that decimal/char/varchar are pretty fundamental SQL types which many Hive 
users are interested in, and I hope this work helps to facilitate that effort. 
If someone wants to take up the torch on unifying integral types as a part of 
this work, that is great too if that is the right thing to do.
                
> Support parameterized primitive types
> -------------------------------------
>
>                 Key: HIVE-5206
>                 URL: https://issues.apache.org/jira/browse/HIVE-5206
>             Project: Hive
>          Issue Type: Improvement
>          Components: Types
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>         Attachments: HIVE-5206.1.patch, HIVE-5206.D12693.1.patch
>
>
> Support for parameterized types is needed for char/varchar/decimal support. 
> This adds a type parameters value to the 
> PrimitiveTypeEntry/PrimitiveTypeInfo/PrimitiveObjectInspector objects. 
> NO PRECOMMIT TESTS - dependent on HIVE-5203/HIVE-5204

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