xzj7019 commented on code in PR #27051:
URL: https://github.com/apache/doris/pull/27051#discussion_r1407389082
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/logical/LogicalWindow.java:
##########
@@ -224,4 +227,52 @@ public Optional<Plan> pushPartitionLimitThroughWindow(long
partitionLimit, boole
return Optional.ofNullable(window);
}
+
+ private void updateFuncDepsByWindowExpr(NamedExpression namedExpression,
FunctionalDependencies.Builder builder) {
+ if (namedExpression.children().size() != 1 ||
!(namedExpression.child(0) instanceof WindowExpression)) {
+ return;
+ }
+ WindowExpression windowExpr = (WindowExpression)
namedExpression.child(0);
+ List<Expression> partitionKeys = windowExpr.getPartitionKeys();
+
+ // window func should return unique results for different rows
+ if (!(windowExpr.getFunction() instanceof RowNumber
+ || windowExpr.getFunction() instanceof Rank)) {
+ return;
+ }
+
+ // Now we only support slot type keys
+ if (!partitionKeys.stream().allMatch(Slot.class::isInstance)) {
+ return;
+ }
+ ImmutableSet<Slot> slotSet = partitionKeys.stream()
+ .map(s -> (Slot) s)
+ .collect(ImmutableSet.toImmutableSet());
+
+ // if partition by keys are unique, output is uniform
+ if
(child(0).getLogicalProperties().getFunctionalDependencies().isUniqueAndNotNull(slotSet))
{
+ if (windowExpr.getFunction() instanceof RowNumber
+ || windowExpr.getFunction() instanceof Rank
+ || windowExpr.getFunction() instanceof DenseRank) {
Review Comment:
1. for unique and not null, i think the function list is not limited for
those three, may be more...
2. DenseRank is not allowed at line 240 before.
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