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OData v4: $filter on $expand'ed 1:1 cardinality on complex type doesn't work


filtering an expanded result set that has inline'd 1:n entities on a complex type, things work as expected:

$expand=toMany($filter=somePropInComplexType eq 'value')

Filtering the same result set on an inline'd 1:1 entity doesn't work:

?$expand=toOne($filter=somePropInComplexType eq 'value')

For demonstration purposes I've built a minimal example over at the "cap community" repo: (backup link on fork:

I've tried both on SQLite and HANA with the same result - 1:n filter works, 1:1 doesn't.


- cds 3.17.4

- sqlite3 4.1.0


Best, Volker

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1 Answer

  • Posted on Oct 14, 2019 at 11:01 AM

    Hi Volker,

    Thanks for raising this issue!
    A filter expression on a to-one relationship is not supported since it is not a collection you're filtering on but either a single entity or no entity at all.

    Do you have a use case for this?

    Thanks a lot and best regards

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