quenlang commented on issue #7297: thetaSketch aggrgator handle null or "" into unexpected value at ingesting URL: https://github.com/apache/incubator-druid/issues/7297#issuecomment-474510220 Thanks for quick reply ! > I don't see how this is possible. OK, maybe it is my mistask. i will do further verification. > Regarding HLL, I think it should use less memory than Theta. In your opinion, do you recommend HLL or Theta in our situation? we only need approximate distinct count.
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