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Subject: [OASIS Issue Tracker] Commented: (ODATA-556) Add "in" operator as syntactic sugar for a chain of "or" expressions

    [ http://tools.oasis-open.org/issues/browse/ODATA-556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36112#action_36112 ] 

Matthew Borges commented on ODATA-556:

One other thing to mention.  In SQL, the IN operator also allows you to specify more than just a list of literals.  For example you can specify a sub-query which returns a single column, or a list of sub-queries which returns a single row and column.  The any/all lambda functions already provide this functionality to a certain extent so it may not make sense to duplicate it with the in operator.

> Add "in" operator as syntactic sugar for a chain of "or" expressions
> --------------------------------------------------------------------
>                 Key: ODATA-556
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-556
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData URL Conventions 
>    Affects Versions: V4.0_CSD03
>            Reporter: Ralf Handl
>             Fix For: V4.1_WD01
> In data analysis it is common to retrieve data that matches one of several distinct values, reflected in SQL as the IN operator.
> This is syntactic sugar, so we need to balance between a convenient notation and adding value to the expression syntax that we already have.
> 1) Using JSON collections and a new "in" operator:
>     CountryCode in ["US","CA","DE"]
> 2) Allowing arbitrary collection expressions on the left side of lambda expressions:
>     ["US","CA","DE"]/any(c:c eq CountryCode)
> 3) Adding an overload to the contains function:
>     contains(["US","CA","DE"], CountryCode)

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