lincoln-lil commented on code in PR #27020:
URL: https://github.com/apache/flink/pull/27020#discussion_r2367093307
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/utils/DeltaJoinUtil.java:
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@@ -276,15 +276,20 @@ private static boolean isTableScanSupported(TableScan
tableScan, int[] lookupKey
// the source must have at least one index, and the join key contains
one index
Set<Integer> lookupKeysSet =
Arrays.stream(lookupKeys).boxed().collect(Collectors.toSet());
+ boolean lookupKeyContainsOneIndex = false;
for (int[] idxsOfIndex : idxsOfAllIndexes) {
Review Comment:
Can we simplify this for-loop into simple call, e.g.,
```
boolean lookupKeyContainsOneIndex = Arrays.stream(idxsOfAllIndexes)
.peek(idxs -> Preconditions.checkState(idxs.length > 0))
.anyMatch(idxs ->
Arrays.stream(idxs).allMatch(lookupKeysSet::contains));
```
?
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