[hrktb]

Thanks for the details.

It was this study: http://olafhartig.de/files/HartigPerez_WWW2018_Preprint.pdf

Overall it acknowledges GraphQL's advantages, while warning that the data retrieval part shouldn't be done naively.

An excerp

> We note that this issue is somehow acknowledged by the Github GraphQL interface and, as a safety measure to avoid queries that might turn out to be too resource-intensive, it introduces a few syntactic restrictions [7]. As one such restriction, Github imposes a maximum level of nesting for queries that it accepts for execution. However, even with this restriction (and other syntactic restric- tions imposed by the Github GraphQL interface [7]), Github fails to avoid all queries that hit some resource limits when executed