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Horizontal aggregation?

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I am looking for a feature that would select from a table with
k1  a
k1  b
k1  c
k2  a
k3  b
k3  c
something like
k1  a b c
k2  a
k3  b c
(Just all elements next to each other, with a space in between)
or perhaps an array output
k1  {a,b,c]
k2  {a}
k3  {b,c}

If such an operator exists, would there be a "remove duplicates" option?

Wolfgang Hamann

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