colsOfInternal
internal inline fun <C> ColumnsResolver<*>.colsOfInternal(type: KType, crossinline filter: ColumnFilter<C>): TransformableColumnSet<C>
If this ColumnsResolver is a SingleColumn, it returns a new ColumnSet containing the columns inside of this SingleColumn that match the given filter and are the given type.
Else, it returns a new ColumnSet containing all columns in this ColumnsResolver that match the given filter and are the given type.