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

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groupUniqArray

Syntax: groupUniqArray(x) or groupUniqArray(max_size)(x)

Creates an array from different argument values. Memory consumption is the same as for the uniqExact function.

The second version (with the max_size parameter) limits the size of the resulting array to max_size elements. For example, groupUniqArray(1)(x) is equivalent to [any(x)].