exposed-jdbc/src/main/kotlin/org/jetbrains/exposed/v1/jdbc/IterableEx.kt [138:164]:
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        if (_empty == null) {
            _empty = delegate.empty()
            if (_empty == true) _size = 0
        }

        return _empty!!
    }

    override fun copy(): SizedIterable<T> = LazySizedCollection(delegate.copy())

    override fun orderBy(vararg order: Pair<Expression<*>, SortOrder>): SizedIterable<T> {
        check(_wrapper == null) { "Can't order already loaded data" }
        delegate = delegate.orderBy(*order)
        return this
    }

    /** Whether the collection already has data loaded by its delegate. */
    fun isLoaded(): Boolean = _wrapper != null
}

/**
 * Returns a [SizedIterable] containing the lazily evaluated results of applying the function [f] to each original element.
 */
infix fun <T, R> SizedIterable<T>.mapLazy(f: (T) -> R): SizedIterable<R> {
    val source = this
    return object : LazySizedIterable<R> {
        override var loadedResult: List<R>? = null
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exposed-r2dbc/src/main/kotlin/org/jetbrains/exposed/v1/r2dbc/IterableEx.kt [141:167]:
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        if (_empty == null) {
            _empty = delegate.empty()
            if (_empty == true) _size = 0
        }

        return _empty!!
    }

    override fun copy(): SizedIterable<T> = LazySizedCollection(delegate.copy())

    override fun orderBy(vararg order: Pair<Expression<*>, SortOrder>): SizedIterable<T> {
        check(_wrapper == null) { "Can't order already loaded data" }
        delegate = delegate.orderBy(*order)
        return this
    }

    /** Whether the collection already has data loaded by its delegate. */
    fun isLoaded(): Boolean = _wrapper != null
}

/**
 * Returns a [SizedIterable] containing the lazily evaluated results of applying the function [f] to each original element.
 */
infix fun <T, R> SizedIterable<T>.mapLazy(f: (T) -> R): SizedIterable<R> {
    val source = this
    return object : LazySizedIterable<R> {
        override var loadedResult: List<R>? = null
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