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From "Dmitry Tolpeko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-17030) HPL/SQL: Many cast operations are ignored without warning or notice.
Date Fri, 08 Sep 2017 14:24:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-17030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitry Tolpeko updated HIVE-17030:
----------------------------------
    Attachment: HIVE-17030.1.patch

> HPL/SQL: Many cast operations are ignored without warning or notice.
> --------------------------------------------------------------------
>
>                 Key: HIVE-17030
>                 URL: https://issues.apache.org/jira/browse/HIVE-17030
>             Project: Hive
>          Issue Type: Bug
>          Components: hpl/sql
>            Reporter: Carter Shanklin
>            Assignee: Dmitry Tolpeko
>            Priority: Critical
>         Attachments: HIVE-17030.1.patch
>
>
> This bug is part of a series of issues and surprising behavior I encountered writing
a reporting script that would aggregate values and give rows different classifications based
on an the aggregate. Addressing some or all of these issues would make HPL/SQL more accessible
to newcomers.
> Consider this code:
> {code}
>   val1d := cast('10.0' as double);
>   val2d := cast('5.0' as double);
>   declare val1i int = 5;
>   declare val2i int = 5;
>   val1i = val1d;
>   diff := val1i - val2i;
> {code}
> What is the value of diff? You might think it is 5 but in fact it is 0. Why? Because
when you attempt to assign val1i to val1d, this code in Var.java is executed:
> {code}
>     else if (type == Type.BIGINT) {
>       if (val.type == Type.STRING) {
>         value = Long.parseLong((String)val.value);
>       }
>     }
>     else if (type == Type.DECIMAL) {
> {code}
> Since there is no case for assigning a double to a bigint, the expression is essentially
ignored and the value remains the same. This behavior leads to many surprising results.
> It would be best if HPL/SQL could re-use the cast code from Hive since there are a lot
of cases to consider.
> Version = 3.0.0-SNAPSHOT r71f52d8ad512904b3f2c4f04fe39a33f2834f1f2



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