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https://issues.apache.org/jira/browse/HIVE-13178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267135#comment-15267135
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Sergey Shelukhin commented on HIVE-13178:
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I think a lot of stuff fails due to stability issues on test machines. It's
almost always some metastore timeout
> Enhance ORC Schema Evolution to handle more standard data type conversions
> --------------------------------------------------------------------------
>
> Key: HIVE-13178
> URL: https://issues.apache.org/jira/browse/HIVE-13178
> Project: Hive
> Issue Type: Bug
> Components: Hive, ORC
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-13178.01.patch, HIVE-13178.02.patch,
> HIVE-13178.03.patch, HIVE-13178.04.patch, HIVE-13178.05.patch,
> HIVE-13178.06.patch, HIVE-13178.07.patch, HIVE-13178.08.patch,
> HIVE-13178.09.patch, HIVE-13178.091.patch, HIVE-13178.092.patch,
> HIVE-13178.093.patch
>
>
> Currently, SHORT -> INT -> BIGINT is supported.
> Handle ORC data type conversions permitted by Implicit conversion allowed by
> TypeIntoUtils.implicitConvertible method.
> * STRING_GROUP -> DOUBLE
> * STRING_GROUP -> DECIMAL
> * DATE_GROUP -> STRING
> * NUMERIC_GROUP -> STRING
> * STRING_GROUP -> STRING_GROUP
> *
> * // Upward from "lower" type to "higher" numeric type:
> * BYTE -> SHORT -> INT -> BIGINT -> FLOAT -> DOUBLE -> DECIMAL
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