private SchemaInfo schemaInfo() {
        var schema = new Schema.Builder("defaultsearchdefinition");
        schema.add(new DocumentSummary.Builder(DEFAULT_SUMMARY_CLASS).addField(FIELD1, "string")
                                                                     .addField(FIELD2, "string").build())
              .add((new DocumentSummary.Builder(SORTABLE_ATTRIBUTES_SUMMARY_CLASS).addField(FIELD2, "string").build()))
              .add((new DocumentSummary.Builder(THIRD_OPTION).addField(FIELD3, "string").build()));
        return new SchemaInfo(List.of(schema.build()), List.of());
    }
Test translation of fields and sources in YQL to the associated concepts in Vespa.
container-search/src/test/java/com/yahoo/search/yql/YqlFieldAndSourceTestCase.java