@Override
    public void setStatementOutput(DocumentType documentType, Field field) {
        destination = documentType.getName() + "." + field.getName();
    }
@return the requested embedder id. This will diverge from the selected embedder's id when executed in config-model
indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/EmbedExpression.java