chunweilei commented on a change in pull request #1814: [CALCITE-3804] Use
RelCollation interface in RelCollationImpl compareTo and satisfies methods
URL: https://github.com/apache/calcite/pull/1814#discussion_r381042482
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File path: core/src/main/java/org/apache/calcite/rel/RelCollationImpl.java
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@@ -97,9 +96,11 @@ public boolean isTop() {
}
public int compareTo(@Nonnull RelMultipleTrait o) {
- final RelCollationImpl that = (RelCollationImpl) o;
- final UnmodifiableIterator<RelFieldCollation> iterator =
- that.fieldCollations.iterator();
+ if (this == o) {
+ return 0;
+ }
+ final RelCollation that = (RelCollation) o;
Review comment:
Agree with @zabetak .
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