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[GitHub] [carbondata] akashrn5 commented on a change in pull request #4142: [CARBONDATA-4193] Fix compaction failure after alter add complex column.

Posted by GitBox on Jun 01, 2021; 3:20pm
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/GitHub-carbondata-ShreelekhyaG-opened-a-new-pull-request-4142-WIP-Fix-compaction-failure-after-alter-tp108434p108513.html


akashrn5 commented on a change in pull request #4142:
URL: https://github.com/apache/carbondata/pull/4142#discussion_r643205770



##########
File path: integration/spark/src/main/java/org/apache/spark/sql/secondaryindex/query/SecondaryIndexQueryResultProcessor.java
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@@ -293,26 +300,32 @@ private void processResult(List<CarbonIterator<RowBatch>> detailQueryResultItera
         // dictionary
         preparedRow[i] = wrapper.getDictionaryKeyByIndex(dictionaryIndex++);
       } else {
-        if (isComplexColumn) {
-          // get the flattened data of complex column
-          byte[] complexKeyByIndex = wrapper.getComplexKeyByIndex(complexIndex);
-          ByteBuffer byteArrayInput = ByteBuffer.wrap(complexKeyByIndex);
-          GenericQueryType genericQueryType =
-              complexDimensionInfoMap.get(complexColumnParentBlockIndexes[complexIndex++]);
-          int complexDataLength = byteArrayInput.getShort(2);
-          // In case, if array is empty
-          if (complexDataLength == 0) {
-            complexDataLength = complexDataLength + 1;
-          }
-          // get flattened array data
-          Object[] complexFlattenedData = new Object[complexDataLength];
-          Object[] data = genericQueryType.getObjectArrayDataBasedOnDataType(byteArrayInput);
-          for (int index = 0; index < complexDataLength; index++) {
-            complexFlattenedData[index] =
-                getData(data, index, dims.getColumnSchema().getDataType());
+        if (isComplexColumn || isComplexColumnAdded) {
+          if (complexColumnParentBlockIndexes.length > 0) {
+            // get the flattened data of complex column
+            byte[] complexKeyByIndex = wrapper.getComplexKeyByIndex(complexIndex);
+            ByteBuffer byteArrayInput = ByteBuffer.wrap(complexKeyByIndex);
+            GenericQueryType genericQueryType =
+                complexDimensionInfoMap.get(complexColumnParentBlockIndexes[complexIndex++]);
+            int complexDataLength = byteArrayInput.getShort(2);
+            // In case, if array is empty
+            if (complexDataLength == 0) {
+              complexDataLength = complexDataLength + 1;
+            }
+            // get flattened array data
+            Object[] complexFlattenedData = new Object[complexDataLength];
+            Object[] data = genericQueryType.getObjectArrayDataBasedOnDataType(byteArrayInput);
+            for (int index = 0; index < complexDataLength; index++) {
+              complexFlattenedData[index] =
+                  getData(data, index, dims.getColumnSchema().getDataType());
+            }
+            // store the dimesnion column index and the complex column flattened data to a map
+            complexDataMap.put(i, complexFlattenedData);
+          } else {
+            // when complex column is added after restructuring and
+            // column not present in parent block, let the SI row value be empty.

Review comment:
       the comment is not meaningful, please restructure the comment and make it simple and understandable




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