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From "Vihang Karajgaonkar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14085) Allow type widening primitive conversion on hive/parquet tables
Date Fri, 24 Jun 2016 21:20:16 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vihang Karajgaonkar updated HIVE-14085:
---------------------------------------
    Affects Version/s:     (was: 2.1.0)
               Status: Patch Available  (was: Open)

> Allow type widening primitive conversion on hive/parquet tables
> ---------------------------------------------------------------
>
>                 Key: HIVE-14085
>                 URL: https://issues.apache.org/jira/browse/HIVE-14085
>             Project: Hive
>          Issue Type: Improvement
>          Components: File Formats
>            Reporter: Vihang Karajgaonkar
>            Assignee: Vihang Karajgaonkar
>         Attachments: HIVE-14085.1.patch
>
>
> There is a JIRA ticket on upstream that brought this usability improvement in Hive to
support auto type widening for Parquet tables. See https://issues.apache.org/jira/browse/HIVE-12080
> This improvement is very useful for users who have schema evolution on their tables.
For example, a Hive table with a "bigint" can read parquet files with "int32" and "int64"
types.
> The patch only supports widening conversions from int->bigint and float->double.
We should support more types to allow users read their changed parquet schema.
> Here's a list of widening conversions we should support:
> {code}
> tinyint     ->  smallint,int,bigint,float,double
> smallint  -> int,bigint,float,double
> int          -> bigint,float,double
> bigint     -> float,double
> float       ->  double
> double   ->  --
> {code}



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