union

Aggregate Function

  union — set union of input values

Synopsis

union(any) -> |[any]|

Description

The union aggregate function computes a set union of its input values. If the values are of uniform type, then the output is a set of that type. If the values are of mixed typs, the the output is a set of union of the types encountered.

Examples

Create a set of values from a simple sequence:

union(this)

1
2
3
3

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Create sets continuously from values in a simple sequence:

yield union(this)

1
2
3
3

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Mixed types create a union type for the set elements:

set:=union(this) |> yield this,typeof(set)

1
2
3
"foo"

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Create sets of values bucketed by key:

union(a) by k |> sort

{a:1,k:1}
{a:2,k:1}
{a:3,k:2}
{a:4,k:2}

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