[GitHub] qiuchenjian commented on a change in pull request #3121: [CARBONDATA-3287]Remove the validation for same schema in a location and fix drop datamap issue

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qiuchenjian commented on a change in pull request #3121: [CARBONDATA-3287]Remove the validation for same schema in a location and fix drop datamap issue
URL: https://github.com/apache/carbondata/pull/3121#discussion_r255292478
 
 

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 File path: core/src/main/java/org/apache/carbondata/core/datamap/DataMapStoreManager.java
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 @@ -322,6 +322,16 @@ public TableDataMap getDataMap(CarbonTable table, DataMapSchema dataMapSchema) {
         tableIndices = allDataMaps.get(tableUniqueName);
       }
     }
+    // in case of fileformat or sdk, when table is dropped or schema is changed the datamaps are
+    // not cleared, they need to be cleared by using API, so compare the columns, if not same, clear
+    // the datamaps on that table
+    if (allDataMaps.size() > 0 && null != allDataMaps.get(tableUniqueName)
 
 Review comment:
   better to use CollectionUtils.isEmpty(allDataMaps.get(tableUniqueName))

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