[GitHub] [carbondata] ajantha-bhat commented on a change in pull request #3493: [CARBONDATA-3600] Fix creating mv timeseries UDF column as partition column

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ajantha-bhat commented on a change in pull request #3493: [CARBONDATA-3600] Fix creating mv timeseries UDF column as partition column
URL: https://github.com/apache/carbondata/pull/3493#discussion_r356934421
 
 

 ##########
 File path: datamap/mv/core/src/main/scala/org/apache/carbondata/mv/datamap/MVDataMapProvider.scala
 ##########
 @@ -95,8 +95,11 @@ class MVDataMapProvider(
       dataMapSchema.getRelationIdentifier.getTableName,
       true)
     dropTableCommand.processMetadata(sparkSession)
-    DataMapStoreManager.getInstance.unRegisterDataMapCatalog(dataMapSchema)
+    // First, drop datamapschema and unregister datamap from catalog, because if in
+    // case, unregister fails, datamapschema will not be deleted from system and cannot
+    // create datamap also again
     DataMapStoreManager.getInstance().dropDataMapSchema(dataMapSchema.getDataMapName)
+    DataMapStoreManager.getInstance.unRegisterDataMapCatalog(dataMapSchema)
 
 Review comment:
   Now If dropDataMapSchema throws exception, unregister will not happen.
   better to keep dropDataMapSchema in try catch and unRegisterDataMapCatalog in finally block

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