In this example, valid data is passed in as a constant VARBYTE.
SELECT AVRO_CHECK ('002274797065223A227265636F7264222C226E616D65223A227265635F30222C226669656C6473223A5B7B226E616D65223A2261222C2274797065223A22696E74227D5D7D0002'xb);
Result:
> Invalid Avro Schema: Unexpected end-of-input