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

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

Add "in" operator as syntactic sugar for a chain of "or" expressions
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                 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.

Using JSON collections and a new "in" operator

    CountryCode in ["US","CA","DE"]

Allowing arbitrary collection expressions on the left side of lambda expressions

    ["US","CA","DE"]/any(c:c eq CountryCode)


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