abhishekagarwal87 commented on code in PR #12558:
URL: https://github.com/apache/druid/pull/12558#discussion_r879029863


##########
sql/src/main/codegen/includes/insert.ftl:
##########
@@ -36,6 +36,11 @@ SqlNode DruidSqlInsertEof() :
     <CLUSTERED> <BY>
     clusteredBy = ClusterItems()
   ]
+  {
+      if (clusteredBy != null && partitionedBy.lhs == null) {
+        throw new ParseException("CLUSTERED BY clause found before PARTITIONED 
BY, the PARITITIONED BY clause has to be specified first before the CLUSTERED 
BY clause.");
+      }
+  }

Review Comment:
   what is the advantage of keeping a check here instead of keeping it in the 
java code? 



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