amaliujia 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_r356282226
##########
File path: core/src/main/java/org/apache/calcite/rel/externalize/RelJson.java
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@@ -191,7 +191,10 @@ public RelFieldCollation toFieldCollation(Map<String,
Object> map) {
}
public RelDistribution toDistribution(Object o) {
- return RelDistributions.ANY; // TODO:
+ final Map map = (Map) o;
Review comment:
Is there a need to check if Object is a Map?
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