Union

Union( group, ... )

Union( group, ... )

Union( group, ... )

Union( group, ... )

union( group, ... )

Union( group, ... )

Description

The Union function combines the results of one or more groups, which can be Arrays or SetRefs.

Parameters

Argument Type Definition and Requirements

Argument	Type	Definition and Requirements
`group`	Array or SetRef	One or more arrays or set references which should have their results OR’d together. All provided `group` items must be of the same type.

group

Array or SetRef

One or more arrays or set references which should have their results OR’d together. All provided group items must be of the same type.

Returns

When group is an array, an array of the items that appear in any provided group.

When group is a set reference, a set reference of the items that appear in any provided group.

Examples

The following query combines the SetRef (i.e. set reference) returned by locating the search term "fire" in the index named "spells_by_element" and the SetRef returned by locating the search term "water" in the Index named "spells_by_element". The Paginate function materialized the results of the Union operation into an array of type Page.

client.Query(
    Paginate(
        Union(
            Match(Index("spells_by_element"), "fire"),
            Match(Index("spells_by_element"), "water")
        )
    )
);

ObjectV(data: Arr(RefV(id = "181388642046968320", collection = RefV(id = "spells", collection = RefV(id = "collections"))), RefV(id = "181388642071085568", collection = RefV(id = "spells", collection = RefV(id = "collections"))), RefV(id = "181388642088911360", collection = RefV(id = "spells", collection = RefV(id = "collections")))))

result, err := client.Query(
	f.Paginate(
		f.Union(
			f.MatchTerm(f.Index("spells_by_element"), "fire"),
			f.MatchTerm(f.Index("spells_by_element"), "water"))))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

map[data:[{181388642046968320 0xc000164180 0xc000164180 <nil>} {181388642071085568 0xc000164330 0xc000164330 <nil>} {181388642088911360 0xc0001644e0 0xc0001644e0 <nil>}]]

System.out.println(
    client.query(
        Paginate(
            Union(
                Match(Index(Value("spells_by_element")), Value("fire")),
                Match(Index(Value("spells_by_element")), Value("water"))
            )
        )
    ).get());

{data: [ref(id = "181388642046968320", collection = ref(id = "spells", collection = ref(id = "collections"))), ref(id = "181388642071085568", collection = ref(id = "spells", collection = ref(id = "collections"))), ref(id = "181388642088911360", collection = ref(id = "spells", collection = ref(id = "collections")))]}

client.query(
  q.Paginate(
    q.Union(
      q.Match(q.Index('spells_by_element'), 'fire'),
      q.Match(q.Index('spells_by_element'), 'water'),
    )
  )
)
.then((ret) => console.log(ret))
.catch((err) => console.error('Error: %s', err))

{
  data: [
    Ref(Collection("spells"), "181388642046968320"),
    Ref(Collection("spells"), "181388642071085568"),
    Ref(Collection("spells"), "181388642088911360")
  ]
}

result = client.query(
  q.paginate(
    q.union(
      q.match(q.index("spells_by_element"), "fire"),
      q.match(q.index("spells_by_element"), "water")
    )
  )
)
print(result)

{'data': [Ref(id=181388642046968320, collection=Ref(id=spells, collection=Ref(id=collections))), Ref(id=181388642071085568, collection=Ref(id=spells, collection=Ref(id=collections))), Ref(id=181388642088911360, collection=Ref(id=spells, collection=Ref(id=collections)))]}

client.query(
  Paginate(
    Union(
      Match(Index("spells_by_element"), "fire"),
      Match(Index("spells_by_element"), "water"))))

{data: [ref(id = "181388642046968320", collection = ref(id = "spells", collection = ref(id = "collections"))), ref(id = "181388642071085568", collection = ref(id = "spells", collection = ref(id = "collections"))), ref(id = "181388642088911360", collection = ref(id = "spells", collection = ref(id = "collections")))]}

The query below is similar to the example above, but it returns document events instead of the index tuples.

client.Query(
    Paginate(
        Union(
            Match(Index("spells_by_element"), "fire"),
            Match(Index("spells_by_element"), "water")
        ),
        events: true
    )
);

ObjectV(data: Arr(ObjectV(ts: LongV(1603756842880000),action: StringV(add),document: RefV(id = "181388642046968320", collection = RefV(id = "spells", collection = RefV(id = "collections")))), ObjectV(ts: LongV(1603756842880000),action: StringV(add),document: RefV(id = "181388642071085568", collection = RefV(id = "spells", collection = RefV(id = "collections")))), ObjectV(ts: LongV(1603756842880000),action: StringV(add),document: RefV(id = "181388642088911360", collection = RefV(id = "spells", collection = RefV(id = "collections"))))))

result, err := client.Query(
	f.Paginate(
		f.Events(
			f.Union(
				f.MatchTerm(f.Index("spells_by_element"), "fire"),
				f.MatchTerm(f.Index("spells_by_element"), "water")))))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

map[data:[map[action:add document:{181388642046968320 0xc000144270 0xc000144270 <nil>} ts:1603747307070000] map[action:add document:{181388642071085568 0xc000144450 0xc000144450 <nil>} ts:1603747307070000] map[action:add document:{181388642088911360 0xc00008e210 0xc00008e210 <nil>} ts:1603747307070000]]]

System.out.println(
    client.query(
        Paginate(
            Events(
                Union(
                    Match(Index(Value("spells_by_element")), Value("fire")),
                    Match(Index(Value("spells_by_element")), Value("water"))
                )
            )
        )
        .events(true)
    ).get());

{data: [{ts: 1594337952410000, action: "add", document: ref(id = "181388642046968320", collection = ref(id = "spells", collection = ref(id = "collections")))}, {ts: 1594337952410000, action: "add", document: ref(id = "181388642071085568", collection = ref(id = "spells", collection = ref(id = "collections")))}, {ts: 1594337952410000, action: "add", document: ref(id = "181388642088911360", collection = ref(id = "spells", collection = ref(id = "collections")))}]}

client.query(
  q.Paginate(
    q.Events(
      q.Union(
        q.Match(q.Index('spells_by_element'), 'fire'),
        q.Match(q.Index('spells_by_element'), 'water'),
      )
    )
  )
)
.then((ret) => console.log(ret))
.catch((err) => console.error('Error: %s', err))

{
  data: [
    {
      ts: 1592112265440000,
      action: 'add',
      document: Ref(Collection("spells"), "181388642046968320")
    },
    {
      ts: 1592112265440000,
      action: 'add',
      document: Ref(Collection("spells"), "181388642071085568")
    },
    {
      ts: 1592112265440000,
      action: 'add',
      document: Ref(Collection("spells"), "181388642088911360")
    }
  ]
}

result = client.query(
  q.paginate(
    q.union(
      q.match(q.index("spells_by_element"), "fire"),
      q.match(q.index("spells_by_element"), "water")
    ),
    events=True
  )
)
print(result)

{'data': [{'ts': 1592870395870000, 'action': 'add', 'document': Ref(id=181388642046968320, collection=Ref(id=spells, collection=Ref(id=collections)))}, {'ts': 1592870395870000, 'action': 'add', 'document': Ref(id=181388642071085568, collection=Ref(id=spells, collection=Ref(id=collections)))}, {'ts': 1592870395870000, 'action': 'add', 'document': Ref(id=181388642088911360, collection=Ref(id=spells, collection=Ref(id=collections)))}]}

client.query(
  Paginate(
    Union(
      Match(Index("spells_by_element"), "fire"),
      Match(Index("spells_by_element"), "water")),
    events = true))

{data: [{ts: 1594491093870000, action: "add", document: ref(id = "181388642046968320", collection = ref(id = "spells", collection = ref(id = "collections")))}, {ts: 1594491093870000, action: "add", document: ref(id = "181388642071085568", collection = ref(id = "spells", collection = ref(id = "collections")))}, {ts: 1594491093870000, action: "add", document: ref(id = "181388642088911360", collection = ref(id = "spells", collection = ref(id = "collections")))}]}

The following query demonstrates how various arrays are evaluated:

Value result = await client.Query(
    Arr(
        Union(Arr("A", "B"), Arr("C", "D")),
        Union(Arr("A", "B"), Arr("B", "C")),
        Union(Arr("A", "B", "C"), Arr("B", "C"), Arr("B", "C", "D")),
        Union(Arr("A", "B", "C"), Arr("B", "B"), Arr("B"))
    )
);

Arr(Arr(StringV(A), StringV(B), StringV(C), StringV(D)), Arr(StringV(A), StringV(B), StringV(C)), Arr(StringV(A), StringV(B), StringV(C), StringV(D)), Arr(StringV(A), StringV(B), StringV(B), StringV(C)))

result, err := client.Query(
	f.Arr{
		f.Union(f.Arr{"A", "B"}, f.Arr{"C", "D"}),
		f.Union(f.Arr{"A", "B"}, f.Arr{"B", "C"}),
		f.Union(f.Arr{"A", "B", "C"}, f.Arr{"B", "C"}, f.Arr{"B", "C", "D"}),
		f.Union(f.Arr{"A", "B", "C"}, f.Arr{"B", "B"}, f.Arr{"B"}),
	})

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

[[A B C D] [A B C] [A B C D] [A B B C]]

System.out.println(
    client.query(
        Arr(
            Union(
                Arr(Value("A"), Value("B")),
                Arr(Value("C"), Value("D"))
            ),
            Union(
                Arr(Value("A"), Value("B")),
                Arr(Value("B"), Value("C"))
            ),
            Union(
                Arr(Value("A"), Value("B"), Value("C")),
                Arr(Value("B"), Value("C")),
                Arr(Value("B"), Value("C"), Value("D"))
            ),
            Union(
                Arr(Value("A"), Value("B"), Value("C")),
                Arr(Value("B"), Value("B")),
                Arr(Value("B"))
            )
        )
    ).get());

[["A", "B", "C", "D"], ["A", "B", "C"], ["A", "B", "C", "D"], ["A", "B", "B", "C"]]

client.query([
  q.Union(['A', 'B'], ['C', 'D']),
  q.Union(['A', 'B'], ['B', 'C']),
  q.Union(['A', 'B', 'C'], ['B', 'C'], ['B', 'C', 'D']),
  q.Union(['A', 'B', 'C'], ['B', 'B'], ['B']),
])
.then((ret) => console.log(ret))
.catch((err) => console.error('Error: %s', err))

[ [ 'A', 'B', 'C', 'D' ],
  [ 'A', 'B', 'C' ],
  [ 'A', 'B', 'C', 'D' ],
  [ 'A', 'B', 'B', 'C' ] ]

result = client.query(
  [
    q.union(["A", "B"], ["C", "D"]),
    q.union(["A", "B"], ["B", "C"]),
    q.union(["A", "B", "C"], ["B", "C"], ["B", "C", "D"]),
    q.union(["A", "B", "C"], ["B", "B"], ["B"]),
  ]
)
print(result)

[['A', 'B', 'C', 'D'], ['A', 'B', 'C'], ['A', 'B', 'C', 'D'], ['A', 'B', 'B', 'C']]

println(Await.result(
  client.query(
    Arr(
      Union(Arr("A", "B"), Arr("C", "D")),
      Union(Arr("A", "B"), Arr("B", "C")),
      Union(Arr("A", "B", "C"), Arr("B", "C"), Arr("B", "C", "D")),
      Union(Arr("A", "B", "C"), Arr("B", "B"), Arr("B"))
    )
  ),
  5.seconds
))

[["A", "B", "C", "D"], ["A", "B", "C"], ["A", "B", "C", "D"], ["A", "B", "B", "C"]]

Was this article helpful?

We're sorry to hear that.
Tell us how we can improve!
Visit Fauna's forums or email docs@fauna.com

Thank you for your feedback!

Union

Description

Parameters

Returns

Examples

Related functions

Keyboard shortcuts

While reading

While searching

URL fragments