ravipesala commented on a change in pull request #3148: [CARBONDATA-3293] Prune
datamaps improvement for count(*)
URL: https://github.com/apache/carbondata/pull/3148#discussion_r266324853
##########
File path:
core/src/main/java/org/apache/carbondata/core/datamap/dev/DataMap.java
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@@ -54,6 +56,13 @@ void init(DataMapModel dataMapModel)
List<T> prune(Expression filter, SegmentProperties segmentProperties,
List<PartitionSpec> partitions, CarbonTable carbonTable) throws
IOException;
+ /**
+ * Prune the data maps for finding the row count. It returns a Map of
+ * blockletpath and the row count
+ */
+ Map<String, Long> getRowCount(Segment segment, List<PartitionSpec>
partitions,
+ Map<String, Long> blockletToRowCountMap, boolean isUpdateFlow) throws
IOException;
Review comment:
I don't think datamap interface users need to know about update flow. Make
it simplified, add another method to get all row count. So add two methods
instead of one method for simplification.
```
getRowCountForEachBlock()
getRowCount()
```
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