[ngrilly]

This is an interesting post, but I'd like to add that modern RDBMS like PostgreSQL 9.5 or MySQL 5.7 are perfectly able to store, index and query JSON documents (for example using the jsonb data type in PostgreSQL combined with GIN/GIST indices). This means they can handle quite well a scenario involving heterogeneous data. The scenario where they remain weak is dealing with a large volume and/or velocity of data, beyond the limits of vertical scaling, and I agree with the author on this.