Hi,

how do I get the unique rows of a Distributed Table in JuliaDB?

`df = table(["a", "a", "a", "b", "b"], ["x", "x", "y", "x", "x"], names = (:X1, :X2), chunks = 2)`

```
julia> df
Distributed Table with 5 rows in 2 chunks:
X1 X2
────────
"a" "x"
"a" "x"
"a" "y"
"b" "x"
"b" "x"
```

Ideally, the output would look like this (i.e. be another Distributed Table):

```
Distributed Table with 3 rows in 2 chunks:
X1 X2
────────
"a" "x"
"a" "y"
"b" "x"
```

Best

Jakob