ClickHouse/docs/en/sql-reference/aggregate-functions/reference/grouparraylast.md

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groupArrayLast

Syntax: groupArrayLast(max_size)(x)

Creates an array of last argument values. For example, groupArrayLast(1)(x) is equivalent to [anyLast (x)].

In some cases, you can still rely on the order of execution. This applies to cases when SELECT comes from a subquery that uses ORDER BY if the subquery result is small enough.

Example

Query:

select groupArrayLast(2)(number+1) numbers from numbers(10)

Result:

┌─numbers─┐
│ [9,10]  │
└─────────┘

In compare to groupArray:

select groupArray(2)(number+1) numbers from numbers(10)

┌─numbers─┐
│ [1,2]   │
└─────────┘