[OASIS Issue Tracker] (ODATA-781) substring: what to return if the start index is outside the first argument string, or the desired length exceeds the remaining string length

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ https://issues.oasis-open.org/browse/ODATA-781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ralf Handl updated ODATA-781:
-----------------------------

    Proposal: 
-Empty string should be returned for an index larger than the length of the string.
-Length too long should be allowed and return as many characters up to the specified length.
-The behavior for a negative index is undefined.
-A negative length is a bad request.

Because negative index is undefined, interoperable clients should not use negative indexes. 

In 4.01, negative indexes mean count from the end, see ODATA-901

  was:
-Empty string should be returned for an index larger than the length of the string.
-Length too long should be allowed and return as many characters up to the specified length.
-The behavior for a negative index is undefined.
-A negative length is a bad request.

Because negative index is undefined, interoperable clients should not use negative indexes. 

In 4.01, negative indexes mean count from the end.


> substring: what to return if the start index is outside the first argument string, or the desired length exceeds the remaining string length
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ODATA-781
>                 URL: https://issues.oasis-open.org/browse/ODATA-781
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData URL Conventions
>    Affects Versions: V4.0_ERRATA02
>         Environment: [Proposed]
>            Reporter: Ralf Handl
>            Assignee: Ralf Handl
>             Fix For: V4.0_ERRATA03
>
>
> This could be a "bad request" returning no results at all, or it could evaluate to null, which may just lead to excluding the offending instance from the result.
> Or a mix of both: negative start index is "bad request", start index or desired length beyond the end of the first argument is "null".



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