cryptoe commented on code in PR #17895:
URL: https://github.com/apache/druid/pull/17895#discussion_r2068648144


##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/MSQControllerTask.java:
##########
@@ -124,7 +125,7 @@ public class MSQControllerTask extends AbstractTask 
implements ClientTaskQuery,
   @JsonCreator
   public MSQControllerTask(
       @JsonProperty("id") @Nullable String id,
-      @JsonProperty("spec") MSQSpec querySpec,
+      @JsonProperty("spec") LegacyMSQSpec querySpec,

Review Comment:
   Since any changes to this class effect backward and forward compatibility 
and the changes to the legacy msq spec seem compatible, can we add a test case 
here were we take a few json payloads of `old msq spec` and try to convert them 
to `legacy msq spec` so that we donot accidentally break backward compatibility 
in the future. 



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