julianhyde commented on code in PR #3263:
URL: https://github.com/apache/calcite/pull/3263#discussion_r1232595295
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core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -3883,6 +3883,59 @@ private static AtomicLong getAtomicLong(String key) {
return atomic;
}
+ /** Support the ARRAYS_OVERLAP function. */
+ public static @Nullable Boolean arraysOverlap(List list1, List list2) {
+ final List bigger = list1.size() > list2.size() ? list1 : list2;
+ final List smaller = list1.size() > list2.size() ? list2 : list1;
+ boolean hasNull = false;
Review Comment:
`retainAll` won't work because it mutates one list.
However, we have `Util.intersects(Collection, Collection)`. It's even
tested. However it assumes that there are no null values.
Maybe you could quickly check for nulls and then call `Util.intersects` when
you've determined that there are no nulls.
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