I mean in the case of _source field that elasticsearc uses. But seems that is separate. My usecase is I want to do querying+filtering on all fields of the document. In this case you have to:

1.store the field or document so you can get back the value (ex: when querying the document)

2.index the field for filtering

3.separately index the field for aggregation(doc_values)

While in rdbms you only need(1).