kishoreg commented on pull request #8074:
URL: https://github.com/apache/pinot/pull/8074#issuecomment-1022688453
can we list out all the options we have
1. Automatically convert set to hyperloglog after a threshold
a. Threshold is set to something 100K by default
b. threshold is set to -1 which means feature is off and folks can change
it
c. user has the ability to control the threshold through query option
(enable_approx_distinct_threshold=100,000)
2. Return error if the threshold is reached
a. user then uses disctintcounthll
The reason why I don't prefer second option where we return error and ask
users to use distinctcounthll
- the users cannot change to distinctcountsql because this will always
return approximate even when it does not hit the threshold.
- most of them will not hit this error in testing and will directly see this
in production which is too late.
- Pinot is mostly accessed programmatically via apps and the app user cannot
really do much when the app returns error.
- distinctcounthll is not really a standard sql and wont work with other
standard tools like tableau, superset etc
My preference is to go with option 1 but start with -1 as the default value
which makes the feature off by default but have the ability to override it
using per query option or server config.
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