kangkaisen commented on a change in pull request #256: Improve cardinality,
avgRowSize, numNodes stat info in OlapScanNode
URL: https://github.com/apache/incubator-doris/pull/256#discussion_r231101584
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File path: fe/src/main/java/org/apache/doris/planner/OlapScanNode.java
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@@ -447,6 +465,13 @@ private void addScanRangeLocations(Partition partition,
scanRangeLocations.addToLocations(scanRangeLocation);
paloRange.addToHosts(new TNetworkAddress(ip, port));
tabletIsNull = false;
+
+ //for CBO
+ if (replica.getRowCount() != -1) {
+ cardinality += replica.getRowCount();
+ totalBytes += replica.getDataSize();
+ }
+ scanBackendIds.add(backend.getId());
Review comment:
Yes. I see. I know only one replica will be read.
the `cardinality ` and `avgRowSize` is only for one replica. the
`cardinality ` and `avgRowSize` will divide replication_num in `computeStats`.
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