vlsi commented on a change in pull request #2623:
URL: https://github.com/apache/calcite/pull/2623#discussion_r761973232
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File path: core/src/main/java/org/apache/calcite/rel/core/Project.java
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@@ -89,25 +94,33 @@ protected Project(
List<RelHint> hints,
RelNode input,
List<? extends RexNode> projects,
- RelDataType rowType) {
+ RelDataType rowType,
+ Set<CorrelationId> variablesSet) {
super(cluster, traits, input);
assert rowType != null;
this.exps = ImmutableList.copyOf(projects);
this.hints = ImmutableList.copyOf(hints);
this.rowType = rowType;
+ this.variablesSet = Objects.requireNonNull(
+ ImmutableSet.copyOf(variablesSet), "variablesSet");
Review comment:
Can `copyOf` ever return `null`?
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