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https://issues.apache.org/jira/browse/IMPALA-3042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-3042:
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Labels: newbie supportability (was: supportability)
> substr() doesn't give warning for invalid start index
> -----------------------------------------------------
>
> Key: IMPALA-3042
> URL: https://issues.apache.org/jira/browse/IMPALA-3042
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.2
> Reporter: Juan Yu
> Priority: Minor
> Labels: newbie, supportability
>
> substr requires an valid start index. however it returns empty string instead
> of giving warning for invalid index.
> substr(string a, int start [, int len]), substring(string a, int start [, int
> len])
> Purpose: Returns the portion of the string starting at a specified point,
> optionally with a specified maximum length. The characters in the string are
> *indexed starting at 1*.
> Return type: string
> {code}
> Query: select substr('hello', 0, 3)
> +-----------------------+
> | substr('hello', 0, 3) |
> +-----------------------+
> | |
> +-----------------------+
> Fetched 1 row(s) in 0.01s
> Query: select substr('hello', 1, 3)
> +-----------------------+
> | substr('hello', 1, 3) |
> +-----------------------+
> | hel |
> +-----------------------+
> Fetched 1 row(s) in 0.01s
> Query: select substr('hello', -5, 3)
> +------------------------+
> | substr('hello', -5, 3) |
> +------------------------+
> | hel |
> +------------------------+
> Fetched 1 row(s) in 0.01s
> {code}
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