[CALCITE-4426] Short-circuit evaluating when comparing two "RelTraitS…

…et"s (Jiatao Tao)
libenchao · Feb 5, 2021 · d21d540 · d21d540
1 parent c475124
commit d21d540
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/core/src/main/java/org/apache/calcite/plan/RelTraitSet.java b/core/src/main/java/org/apache/calcite/plan/RelTraitSet.java
@@ -483,6 +483,9 @@ public <T extends RelTrait> T canonize(T trait) {
    * @see org.apache.calcite.plan.RelTrait#satisfies(RelTrait)
    */
   public boolean satisfies(RelTraitSet that) {
+    if (this == that) {
+      return true;
+    }
     final int n =
         Math.min(
             this.size(),