When using Turnilo on any query I've tried (although I'll provide https://w.wiki/xPx as an example), going into the ⚙️ gear menu and selecting "Display Druid query" always returns "General error: Unexpected error occurred".
Unfortunately the JS console is not very helpful, as Turnilo's has of course been minified, but here's the stack trace:
main.js?v=1.29.0:2 Error: Can not have un-introspected external at main.js?v=1.29.0:2 at Array.forEach (<anonymous>) at n.failIfIntrospectNeededInDatum (main.js?v=1.29.0:2) at n.e.simulateQueryPlan (main.js?v=1.29.0:2) at xN (main.js?v=1.29.0:2) at yo (main.js?v=1.29.0:2) at Xo (main.js?v=1.29.0:2) at Go (main.js?v=1.29.0:2) at Rs (main.js?v=1.29.0:2) at xs (main.js?v=1.29.0:2) main.js?v=1.29.0:2 Error: Can not have un-introspected external at main.js?v=1.29.0:2 at Array.forEach (<anonymous>) at n.failIfIntrospectNeededInDatum (main.js?v=1.29.0:2) at n.e.simulateQueryPlan (main.js?v=1.29.0:2) at xN (main.js?v=1.29.0:2) at yo (main.js?v=1.29.0:2) at Xo (main.js?v=1.29.0:2) at Go (main.js?v=1.29.0:2) at Rs (main.js?v=1.29.0:2) at xs (main.js?v=1.29.0:2)