Try using approxCountDistinct to reduce processing time

[sunahsuh]

The experiment aggregates job is still timing out, so I think it's worth at least giving this a try

[fbertsch]

Hmm. This is a real mystery. My guess is this won't fix it :/

[codecov-io]

Codecov Report

Merging #276 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #276   +/-   ##
=======================================
  Coverage   66.11%   66.11%           
=======================================
  Files          37       37           
  Lines        3373     3373           
  Branches       83       83           
=======================================
  Hits         2230     2230           
  Misses       1143     1143

Impacted Files	Coverage Δ
...try/experiments/analyzers/ExperimentAnalyzer.scala	100% <100%> (ø)	⬆️

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