static Record7<Long, Long, Long, Long, String, Integer, String> newRecord() {
    return DSL.using(SQLDialect.MYSQL)
        .newRecord(
            ZipkinSpans.ZIPKIN_SPANS.TRACE_ID_HIGH,
            ZipkinSpans.ZIPKIN_SPANS.TRACE_ID,
            ZipkinSpans.ZIPKIN_SPANS.PARENT_ID,
            ZipkinSpans.ZIPKIN_SPANS.ID,
            ZipkinAnnotations.ZIPKIN_ANNOTATIONS.A_KEY,
            ZipkinAnnotations.ZIPKIN_ANNOTATIONS.A_TYPE,
            ZipkinAnnotations.ZIPKIN_ANNOTATIONS.ENDPOINT_SERVICE_NAME);
  }
Service links to empty string are confusing and offer no value.
zipkin-storage/mysql-v1/src/test/java/zipkin2/storage/mysql/v1/DependencyLinkV2SpanIteratorTest.java