[Feature] group_uniq_array function

[Yukang-Lian]

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Description

syntax: groupUniqArray(x) or groupUniqArray(max_size)(x)

function: Creates an array from different argument values.

SELECT *
FROM arrays_test
┌─s───────┬─arr─────┐
│ alex    │ [1,2]   │
│ hello   │ [1,2]   │
│ World   │ [3,4,5] │
│ Goodbye │ []      │
└─────────┴─────────┘

SELECT groupUniqArray(arr) from arrays_test
┌─groupUniqArray(arr)─┐
│ [[],[1,2],[3,4,5]]  │
└─────────────────────┘

Use case

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Related issues

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• Yes I am willing to submit a PR!

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[Hastyshell]

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[Hastyshell]

When doing this job,I found that this function is quite similar with collect_set, except for the 'max_size ' limit.The sibling function group_array seems also in this situation.Shall we upgrade the collect_set and collect_list to support the same semantics of the above two,or just simply create new functions as group_uniq_array and group_array ?