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https://issues.apache.org/jira/browse/HIVE-14085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348665#comment-15348665
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Vihang Karajgaonkar commented on HIVE-14085:
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[~spena] Can you take a look at the patch? Thanks!
> 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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