fuse

Aggregate Function

  fuse — compute a fused type of input values

Synopsis

fuse(any) -> type

Description

The fuse aggregate function applies type fusion to its input and returns the fused type.

This aggregation is useful with group-by for data exploration and discovery
when searching for shaping rules to cluster a large number of varied input types to a smaller number of fused types each from a set of interrelated types.

Examples

Fuse two records:

echo '{a:1,b:2}{a:2,b:"foo"}' | zq -z 'fuse(this)' -

=>

<{a:int64,b:(int64,string)}>

Fuse records with a group-by key:

echo '{a:1,b:"bar"}{a:2.1,b:"foo"}{a:3,b:"bar"}' | zq -z 'fuse(this) by b | sort' -

=>

{b:"bar",fuse:<{a:int64,b:string}>}
{b:"foo",fuse:<{a:float64,b:string}>}