SUMMARIZE_NUMCOL in the 3rd SQL is really slow, finishing in more than 10mins. Is there a way to speed it up?
Well, yea, you're running a statistical summary across 17B rows. I'd expect that to take at least a little while...
It's meant as an exploratory function - not something you'd actually bake into a production process. Also, if you don't need all those statistics, you could just call specific things like stddev() or whatever, if that's what you're actually interested in.
Can't find what you're looking for? Search the Vertica Documentation, Knowledge Base, or Blog for more information.