Array of UUID's as function input failing to generate valid GraphQL

[TristenHarr]

This issue was originally surfaced in Discord here.

When creating a function and tracking it such as follows:

CREATE
OR REPLACE FUNCTION public.select_from_tmp(uuids uuid []) RETURNS SETOF tmp LANGUAGE plpgsql STABLE AS $ function $ BEGIN RETURN QUERY
SELECT
  *
FROM
  tmp
WHERE
  id = ANY(uuids);
END;
$ function $

The GraphQL engine does not allow queries or calling this function.

query Q($uuids: _uuid = ["2f03ebf9-2005-42e5-b1c4-9661c5643948"]) {
  select_from_tmp(args: {uuids: $uuids}) {
    id
  }
}

Yields the following:

{
  "errors": [
    {
      "message": "A string is expected for type: _uuid",
      "extensions": {
        "path": "$.selectionSet.select_from_tmp.args.args.uuids",
        "code": "parse-failed"
      }
    }
  ]
}

Yet changing things to a string also fails:

query Q($uuids: _uuid = "2f03ebf9-2005-42e5-b1c4-9661c5643948") {
  select_from_tmp(args: {uuids: $uuids}) {
    id
  }
}

yields:

{
  "errors": [
    {
      "message": "malformed array literal: \"2f03ebf9-2005-42e5-b1c4-9661c5643948\"",
      "extensions": {
        "path": "$",
        "code": "data-exception"
      }
    }
  ]
}

What should be possible via:

query Q($uuids: [_uuid!]!) {
  select_from_tmp(args: {uuids: $uuids}) {
    id
  }
}

Is not possible and yields an error.

{
  "errors": [
    {
      "message": "variable 'uuids' is declared as '[_uuid!]!', but used where '_uuid' is expected",
      "extensions": {
        "path": "$.selectionSet.select_from_tmp.args.args.uuids",
        "code": "validation-failed"
      }
    }
  ]
}

It should be possible to create a function that needs an array of UUID's as the input and call that function!