[GitHub] [calcite] yanlin-Lynn commented on a change in pull request #1642: [CALCITE-3583] Support serialized to json and deserialized from json for Exchange relation operator

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yanlin-Lynn commented on a change in pull request #1642: [CALCITE-3583] Support serialized to json and deserialized from json for Exchange relation operator
URL: https://github.com/apache/calcite/pull/1642#discussion_r357495982
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/rel/RelDistributions.java
 ##########
 @@ -80,6 +80,15 @@ public static RelDistribution range(Collection<? extends Number> numbers) {
     return RelDistributionTraitDef.INSTANCE.canonize(trait);
   }
 
+  /** Creates a distribution. */
+  public static RelDistribution distribution(
+      RelDistribution.Type type, List<Number> keys) {
+    ImmutableIntList list = ImmutableIntList.copyOf(keys);
+    RelDistributionImpl trait =
+        new RelDistributionImpl(type, list);
+    return RelDistributionTraitDef.INSTANCE.canonize(trait);
+  }
+
 
 Review comment:
   Because `RelDistributionImpl` is private, need this method to create a RelDistributionImpl object from json string.

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