JSON:
URL: http://localhost:8080/odata4/olingo_basic/Source/SimpleTableView/?$filter=clobval%20eq%201&$format=json
Actual result: {"error":{"code":null,"message":"TEIID30492 Non-comparable expression of type object cannot be used in comparison: g4.clobval = ?."}}
Expected result: "code":30492

XML (in this case OData returns HTTP status code instead of error code):
URL: http://localhost:8080/odata4/olingo_basic/Source/SimpleTableView/?$filter=clobval%20eq%201&$format=xml
Result:

<error>
  <code>500</code>
  <message>TEIID30492 Non-comparable expression of type object cannot be used in comparison: g1.clobval = ?.</message>
</error>

Expected result:

<code>:30492</code>