manishgupta88 commented on a change in pull request #3148: [CARBONDATA-3293]
Prune datamaps improvement for count(*)
URL: https://github.com/apache/carbondata/pull/3148#discussion_r266535183
##########
File path:
hadoop/src/main/java/org/apache/carbondata/hadoop/api/CarbonTableInputFormat.java
##########
@@ -624,36 +624,43 @@ public BlockMappingVO getBlockRowCount(Job job,
CarbonTable table,
.clearInvalidSegments(getOrCreateCarbonTable(job.getConfiguration()),
toBeCleanedSegments);
}
- List<ExtendedBlocklet> blocklets =
- blockletMap.prune(filteredSegment, (FilterResolverIntf) null,
partitions);
- for (ExtendedBlocklet blocklet : blocklets) {
- String blockName = blocklet.getPath();
- blockName = CarbonTablePath.getCarbonDataFileName(blockName);
- blockName = blockName + CarbonTablePath.getCarbonDataExtension();
-
- long rowCount = blocklet.getDetailInfo().getRowCount();
-
- String segmentId =
Segment.toSegment(blocklet.getSegmentId()).getSegmentNo();
- String key = CarbonUpdateUtil.getSegmentBlockNameKey(segmentId,
blockName);
-
- // if block is invalid then don't add the count
- SegmentUpdateDetails details =
updateStatusManager.getDetailsForABlock(key);
-
- if (null == details ||
!CarbonUpdateUtil.isBlockInvalid(details.getSegmentStatus())) {
- Long blockCount = blockRowCountMapping.get(key);
- if (blockCount == null) {
- blockCount = 0L;
- Long count = segmentAndBlockCountMapping.get(segmentId);
- if (count == null) {
- count = 0L;
+ if (isIUDTable || isUpdateFlow) {
+ Map<String, Long> blockletToRowCountMap =
+ defaultDataMap.getBlockRowCount(filteredSegment, partitions,
defaultDataMap);
+ // key is the (segmentId","+blockletPath) and key is the row count of
that blocklet
+ for (Map.Entry<String, Long> eachBlocklet :
blockletToRowCountMap.entrySet()) {
+ String[] segmentIdAndPath = eachBlocklet.getKey().split(",", 2);
+ String segmentId = segmentIdAndPath[0];
+ String blockName = segmentIdAndPath[1];
+ blockName = CarbonTablePath.getCarbonDataFileName(blockName);
+ blockName = blockName + CarbonTablePath.getCarbonDataExtension();
Review comment:
I dont see filepath getting used so while filling in the map you can fill
only the fileName with extension. So here these duplicate operations can be
removed. While filling you in the map you can put
`segmentId + '_' + new String(dataMapRow.getByteArray(FILE_PATH_INDEX),
CarbonCommonConstants.DEFAULT_CHARSET_CLASS)+
CarbonTablePath.getCarbonDataExtension()`
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