datastore: Filter seems not to work on Strings

var q = ds.createQuery('Myobject').filter("state =", "DONE").order("-createdAt").limit(500)

Does not return anything, while removing the filter returns some 'state = DONE' objects

@silvolu

Looking at it.

@silvolu, another case for regression tests if we're missing it.

@proppy

@proppy, I receive no results for the following runQuery request proto, although there is a record. Could it to be related to a missing index?

{
    "readOptions": {
        "transaction": null
    },
    "query": {
        "projection": [],
        "kinds": [{
            "name": "Company"
        }],
        "filter": {
            "compositeFilter": {
                "filters": [{
                    "propertyFilter": {
                        "property": {
                            "name": "name"
                        },
                        "operator": "EQUAL",
                        "value": {
                            "properties": {
                                "stringValue": "Google"
                            }
                        }
                    }
                }],
                "operator": "AND"
            }
        },
        "order": [],
        "groupBy": []
    }
}