asereda-gs commented on a change in pull request #1119: [CALCITE-2937] Linq4j:
implement LazyEnumerable
URL: https://github.com/apache/calcite/pull/1119#discussion_r267502605
##########
File path: linq4j/src/main/java/org/apache/calcite/linq4j/Linq4j.java
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@@ -524,6 +525,39 @@ public void close() {
}
}
+ /**
+ * Returns an {@link Enumerable} whose computation (via a {@link Supplier})
will be
+ * postponed until it is actually required
+ *
+ * @param supplier Enumerable supplier
+ * @param <E> Element type
+ *
+ * @return Lazy enumerable
+ */
+ public static <E> Enumerable<E> lazyEnumerable(Supplier<Enumerable<E>>
supplier) {
Review comment:
I'm not sure if `linq4j` package can now depend directly on Java8 (calcite
does).
If not, there is linq4j equivalent of `Supplier` :
[Function0](https://github.com/apache/calcite/blob/master/linq4j/src/main/java/org/apache/calcite/linq4j/function/Function0.java)
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