[GitHub] [carbondata] dhatchayani commented on a change in pull request #3148: [CARBONDATA-3293] Prune datamaps improvement for count(*)

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dhatchayani commented on a change in pull request #3148: [CARBONDATA-3293] Prune datamaps improvement for count(*)
URL: https://github.com/apache/carbondata/pull/3148#discussion_r267324031
 
 

 ##########
 File path: core/src/main/java/org/apache/carbondata/core/datamap/TableDataMap.java
 ##########
 @@ -499,4 +501,47 @@ public DataMapFactory getDataMapFactory() {
     }
     return prunedSegments;
   }
+
+  /**
+   * Prune the datamap of the given segments and return the Map of blocklet path and row count
+   *
+   * @param segments
+   * @param partitions
+   * @return
+   * @throws IOException
+   */
+  public Map<String, Long> getBlockRowCount(List<Segment> segments,
+      final List<PartitionSpec> partitions, TableDataMap defaultDataMap)
+      throws IOException {
+    Map<String, Long> blockletToRowCountMap = new HashMap<>();
+    for (Segment segment : segments) {
+      List<CoarseGrainDataMap> dataMaps = defaultDataMap.getDataMapFactory().getDataMaps(segment);
+      for (CoarseGrainDataMap dataMap : dataMaps) {
+        dataMap.getRowCountForEachBlock(segment, partitions, blockletToRowCountMap);
+      }
+    }
+    return blockletToRowCountMap;
+  }
+
+  /**
+   * Prune the datamap of the given segments and return the Map of blocklet path and row count
+   *
+   * @param segments
+   * @param partitions
+   * @return
+   * @throws IOException
+   */
+  public Map<String, Long> getRowCount(List<Segment> segments,
 
 Review comment:
   This map will have only one entry. We need a map to form BlockMappingVO object which in turn is used in CarbonUpdateUtil#getRowCount method(called from CarbonCountStar), where we check for the IUD scenario.

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