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https://issues.apache.org/jira/browse/IMPALA-12478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Becker resolved IMPALA-12478.
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Resolution: Fixed
> Invalid length in StringValue::LeastSmallerString()
> ---------------------------------------------------
>
> Key: IMPALA-12478
> URL: https://issues.apache.org/jira/browse/IMPALA-12478
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
>
> In StringValue::LeastSmallerString() we do not check if 'len' is 0 before
> subtracting 1 from it. The resulting, possibly negative value is later used
> as the length of a new string.
> See
> [https://github.com/apache/impala/blob/ae14d78c8f2e8366e67aa8c39f0c02c60862905e/be/src/runtime/string-value.cc#L51]
> Also, the name of the function should actually be LargestSmallerString(), cf.
> LeastLargerString().
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