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Subject: [OASIS Issue Tracker] Commented: (ODATA-239) Allowing expressions to be passed as parameters to (super) functions
[ http://tools.oasis-open.org/issues/browse/ODATA-239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32592#action_32592 ] Ralf Handl commented on ODATA-239: ---------------------------------- Hubert, Martin, Gerald and I discussed this and we think that we don't need that distinction in the URL "signature"; it's a server secret of how it evaluates this expression.The Function element is just telling the client how to call it. We are not defining a programming language. > Allowing expressions to be passed as parameters to (super) functions > -------------------------------------------------------------------- > > Key: ODATA-239 > URL: http://tools.oasis-open.org/issues/browse/ODATA-239 > Project: OASIS Open Data Protocol (OData) TC > Issue Type: New Feature > Components: OData CSDL > Affects Versions: V4.0_WD01 > Environment: [Proposed] > Reporter: Hubert Heijkers > > To be able to use/extend the set of functions that can be used in a $apply query option functions need parameters of type expression, which expression can then be applied to each and every instance in the set they are processing. > An very simple example of such a function would: > $apply=GroupBy()/TopN(N=5, Value=Revenue) > Where 5 is just a number indicating the top N we are interested in but were 'Revenue' is actually an expression referring to the Revenue property of the entity in the set the function is acting upon. A better example in which this becomes more apparent would be: > $apply=GroupBy()/TopN(N=5, Value=Revenue sub Cost) > For build in functions we can obviously simply define this but currently there is no way of defining a 'custom' function that could implement the same behavior because we can't pass in expressions. > We then could annotate these functions to signal to tools that they can be used in $apply. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://tools.oasis-open.org/issues/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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