Move/Insert after nested column breaks #1056
Description
To reproduce:
val df = dataFrameOf("a", "b", "c")(1, 2, 3, 4, 5, 6) val grouped = df.group { a and b and c }.into("g") grouped.insert("d") { g.b * g.c }.after { g.b } // or grouped.move { g.a }.after { g.b }
The problem lies with move, as insert calls move as part of its implementation.
We should either prohibit this behavior with a helpful exception or fix the behavior.