Spark looks really exciting for out users. I'm trying it on our Mixpanel instance but every query fails almost instantly - but they still count towards our quote.
Hey there Steve B., thanks for giving it a try!
There are other reports of this happening on particular projects; could you DM me with your project ID? I think we have identified the root causes but want to make sure it gets fixed everywhere.
I just started testing out Spark, and I'm running into the same issue where it thinks for a few minutes and fails on relatively simple queries like "show me the conversion rate between Trial Activated and First Payment over the last 13 months"