@Test
    void testFields() {
        assertSummaryFields("select fieldA from bar where price <= 500", List.of("fieldA"));
        assertSummaryFields("select fieldA, fieldB from bar where price <= 500", List.of("fieldA", "fieldB"));
        assertSummaryFields("select fieldA, fieldB, fieldC from bar where price <= 500", List.of("fieldA", "fieldB", "fieldC"));
        assertSummaryFields("select * from bar where price <= 500", List.of());
    }
Specification for the conversion of YQL+ expressions to Vespa search queries.

@author Steinar Knutsen
@author Stian Kristoffersen
container-search/src/test/java/com/yahoo/search/yql/YqlParserTestCase.java