[GitHub] [carbondata] qiuchenjian commented on a change in pull request #3129: [CARBONDATA-3295] Fix that MV datamap throw exception because its rewrite algorithm when query SQL has multiply subquery

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qiuchenjian commented on a change in pull request #3129: [CARBONDATA-3295] Fix that MV datamap throw exception because its rewrite algorithm when query SQL has multiply subquery
URL: https://github.com/apache/carbondata/pull/3129#discussion_r283600537
 
 

 ##########
 File path: datamap/mv/core/src/main/scala/org/apache/carbondata/mv/datamap/MVHelper.scala
 ##########
 @@ -596,12 +596,20 @@ object MVHelper {
         case g: GroupBy =>
           MVHelper.updateDataMap(g, rewrite)
       }
-      // TODO Find a better way to set the rewritten flag, it may fail in some conditions.
-      val mapping =
-        rewrittenPlan.collect { case m: ModularPlan => m } zip
-        updatedDataMapTablePlan.collect { case m: ModularPlan => m }
-      mapping.foreach(f => if (f._1.rewritten) f._2.setRewritten())
 
+      // Use coarse equal to set the rewritten flag
+      // We may change the ModularPlan relation
+      // So we match the node excluding child comparison
+      updatedDataMapTablePlan.map(plan => {
+        if (rewrittenPlan.find (
+          oriPlan => oriPlan.rewritten && (plan match {
+            case select: Select => select.coarseEqual(oriPlan)
 
 Review comment:
   done

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