[web/facet] Use an Exists node in HasRelationFacet The generated RQL now includes an EXISTS clause. For instance, one gets: :: DISTINCT Any WHERE X is CWUser, EXISTS(X in_group A) instead of: :: DISTINCT Any WHERE X is CWUser, X in_group A for a HasRelationFacet with ``rtype = 'in_group'``, which is more appropriate for testing the existence of the relation. Add a test for this facet along the way.

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[MESSAGES CONTROL]

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disable-msg = C0301

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[VARIABLES]

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# Enable / disable this checker

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enable-variables = yes

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additional-builtins = _, display_name

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[BASIC]

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required-attributes=

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attr-rgx = (w|[a-z_][a-z0-9_]{2,30})

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variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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[TYPECHECK]

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generated-members=debug,info,notice,warning,error,critical,exception