If you really need to use `DISTINCT ON()` function...

# exposed

[tapac]

If you really need to use DISTINCT ON() function feel free to implement it locally:

fun <T>Column<T>.distinctOn() = object : ExpressionWithColumnType<T?>() {
    override val columnType = [e-mail]
    override fun toSQL(queryBuilder: QueryBuilder) = "DISTINCT ON(${[e-mail](queryBuilder)})"
}