apoc.coll.unionAll
FunctionDeprecated in Cypher 25

This function is deprecated. Use Cypher’s list concatenation instead.

Details
Syntax	`apoc.coll.unionAll(list1, list2)`
Description	Returns the full union of the two given `LIST<ANY>` values (duplicates included).
Arguments	Name	Type	Description
	`list1`	`LIST<ANY>`	The list of values to compare against `list2` and form a union from.
	`list2`	`LIST<ANY>`	The list of values to compare against `list1` and form a union from.
Returns	`LIST<ANY>`

Usage examples

The following examples create the full union of two lists using both APOC and Cypher:

Cypher’s list concatenation

RETURN [1,2,3,4,5] + [3,4,5,6,7] AS output

apoc.coll.unionAll

RETURN apoc.coll.unionAll([1,2,3,4,5], [3,4,5,6,7]) AS output

Results
Output
[1, 2, 3, 4, 5, 3, 4, 5, 6, 7]