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