NobiGo commented on PR #4474:
URL: https://github.com/apache/calcite/pull/4474#issuecomment-3115905027
> I believe this is not the root cause of the incorrect query results. It's
related to #4375.
>
> The issue occurs in the Decorrelator. PR-4375 appears to have missed some
cases where parentPropagatesNullValues should be set to false when Correlate's
joinType is not Left.
>
> I'm confident the following modification can fix all tests in this PR.
>
> ```
> diff --git
a/core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java
b/core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java
> index b5500c871..e150079c7 100644
> --- a/core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java
> +++ b/core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java
> @@ -1629,7 +1629,8 @@ private static boolean isWidening(RelDataType type,
RelDataType type1) {
> }
>
> frameStack.push(Pair.of(rel.getCorrelationId(), leftFrame));
> - final Frame rightFrame = getInvoke(oldRight, true, rel,
parentPropagatesNullValues);
> + final Frame rightFrame = getInvoke(oldRight, true, rel,
> + parentPropagatesNullValues && rel.getJoinType() ==
JoinRelType.LEFT);
> frameStack.pop();
> ```
I will recheck this.
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