dcount — count distinct input values
dcount(<any>) -> uint64
The dcount aggregation function uses hyperloglog to estimate distinct values of the input in a memory efficient manner.
Anded value of simple sequence:
echo '1 2 2 3' | zq -z 'dcount(this)' -
=>
3(uint64)
Continuous count of simple sequence:
echo '1 2 2 3' | zq -z 'yield dcount(this)' -
=>
1(uint64)
2(uint64)
2(uint64)
3(uint64)
Mixed types are handled:
echo '1 "foo" 10.0.0.1' | zq -z 'yield dcount(this)' -
=>
1(uint64)
2(uint64)
3(uint64)