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_r267493925
##########
File path:
core/src/main/java/org/apache/carbondata/core/datamap/TableDataMap.java
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@@ -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:
I am aware of IUD scenario but I am not sure why IUD scenario related to
datamap in this API, If your API says `getRowCount` then just return the row
count as long , not the Map. Caller methods should handle the IUD scenarios,
not in this API.
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