Automatically extract inline variables to improve performance

[radekmie]

Is your feature request related to a problem? Please describe.

We host a public GraphQL API, and some of our end users are completely new to GraphQL. We try to teach them to use variables and call operations reasonably, but some of them are not willing to cooperate.

As a result, for these users, we have 100% APQ misses. If #7130 was implemented, we could disallow such operations. But I realized it would be better to automatically transform their operations using the same logic as the "Extract Variables" in Apollo Explorer. The benefit is obvious: fewer APQ misses means fewer roundtrips, which results in lower overall latency.

Describe the solution you'd like

A new option that'd transform all operations with "Extract Variables".

Describe alternatives you've considered

• Blocking all operations with inline variables on the subgraph level. It's much less efficient, plus it would have to be implemented for each subgraph.
• Implement it as a plugin. Unfortunately, it's not possible now (again, see feature request(native plugin): hook into parsing and validation stage #7130).

Additional context

None.