libenchao commented on code in PR #3311:
URL: https://github.com/apache/calcite/pull/3311#discussion_r1316730290
##########
linq4j/src/main/java/org/apache/calcite/linq4j/EnumerableDefaults.java:
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@@ -4495,6 +4492,27 @@ private boolean advanceRight(TInner right, TKey
rightKey) {
}
}
+ public static int compareNullsLastForMergeJoin(@Nullable Comparable v0,
@Nullable Comparable v1) {
+ return compareNullsLastForMergeJoin(v0, v1, null);
+ }
+
+ public static int compareNullsLastForMergeJoin(@Nullable Comparable v0,
@Nullable Comparable v1,
+ @Nullable Comparator comparator) {
+ // Special code for mergeJoin algorithm: in case of two null values, they
must not be
+ // considered as equal (otherwise the join would return incorrect
results); instead, consider
+ // the first (left) value as "bigger", to advance on the right value and
continue with the
+ // algorithm
+ if (v0 == null && v1 == null) {
+ return 1;
Review Comment:
The idea sounds good to me. I'm not sure what's happened with Github, there
are a lot of unrelated commits identified by Github, now it's hard to view the
changes, what do you think about rebase it to latest main?
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