dcount

Aggregate Function

  dcount — count distinct input values

Synopsis

dcount(<any>) -> uint64

Description

The dcount aggregation function uses hyperloglog to estimate distinct values of the input in a memory efficient manner.

Examples

Anded value of simple sequence:

echo '1 2 2 3' | zq -z 'dcount(this)' -

=>

{dcount: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)