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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-65) Implict conversion from integer to long broken for Dynamic Serde tables
Date Wed, 03 Dec 2008 04:54:44 GMT

    [ https://issues.apache.org/jira/browse/HIVE-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652681#action_12652681
] 

Zheng Shao commented on HIVE-65:
--------------------------------

Namit's experiment with Oracle shows Oracle outputs ambiguity if UDF has both evaluate(double,
double) and evaluate(string,string), and users calls udf(double, string).

Let's stick with the following implicit conversion hierarchy and special-case comparison operators
(they will prefer evaluate(double, double) to evaluate(string,string)):
byte -> short -> int -> long -> float -> double -> string, string ->
double

In order to allow the special case, we can add a tag to the methods. If there are multiple
methods with the same number of implicit conversions, then we choose the one with the maximum
tag (if there are still many then we say ambiguity).

The reason that I think long -> float should be allowed is http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#25214
This of course also simplify the code since it's a single line instead of a DAG.


> Implict conversion from integer to long broken for Dynamic Serde tables
> -----------------------------------------------------------------------
>
>                 Key: HIVE-65
>                 URL: https://issues.apache.org/jira/browse/HIVE-65
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Ashish Thusoo
>            Assignee: Zheng Shao
>
> For a dynamic serde table that has a bigint column, implict conversion from int to bigint
seems to be broken. I have not verified this for other tables.

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