cryptoe commented on code in PR #16987:
URL: https://github.com/apache/druid/pull/16987#discussion_r1740858649


##########
server/src/main/java/org/apache/druid/client/indexing/ClientCompactionRunnerInfo.java:
##########
@@ -137,7 +139,14 @@ public static CompactionConfigValidationResult 
validatePartitionsSpecForMSQ(Part
       return CompactionConfigValidationResult.failure(
           "MSQ: Invalid partitioning type[%s]. Must be either 'dynamic' or 
'range'",
           partitionsSpec.getClass().getSimpleName()
-
+      );
+    }
+    if (partitionsSpec instanceof DimensionRangePartitionsSpec
+        && ((DimensionRangePartitionsSpec) 
partitionsSpec).getTargetRowsPerSegment() == null) {
+      // Indicates maxRowsPerSegment is non-null. Cannot check directly for 
maxRowsPerSegment==null since a resolved
+      // value is computed from targetRowsPerSegment.
+      return CompactionConfigValidationResult.failure(
+          "MSQ: 'maxRowsPerSegment' not supported with 'range' partitioning"

Review Comment:
   Should we instruct the user to remove this config from the compaction spec 
as well ?



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