core/org.jetbrains.kotlinx.dataframe.impl.aggregation/intraComparableColumns

intraComparableColumns

internal fun <T> Aggregatable<T>.intraComparableColumns(): ColumnsSelector<T, Comparable<Any>?>

Emulates selecting all columns whose values are mutually comparable to each other. These are columns of type R where R : Comparable<R>.

There is no way to denote this generically in types, however, hence the fake type Comparable<Any> is used. (Comparable<Nothing> would be more correct, but then the compiler complains)