imay closed pull request #256: Improve cardinality, avgRowSize, numNodes stat
info in OlapScanNode
URL: https://github.com/apache/incubator-doris/pull/256
This is a PR merged from a forked repository.
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diff --git a/fe/src/main/java/org/apache/doris/planner/OlapScanNode.java
b/fe/src/main/java/org/apache/doris/planner/OlapScanNode.java
index 578c3fc6..8c4b71a5 100644
--- a/fe/src/main/java/org/apache/doris/planner/OlapScanNode.java
+++ b/fe/src/main/java/org/apache/doris/planner/OlapScanNode.java
@@ -93,9 +93,12 @@
private long totalTabletsNum = 0;
private long selectedIndexId = -1;
private int selectedPartitionNum = 0;
+ private long totalBytes = 0;
boolean isFinalized = false;
+ private HashSet<Long> scanBackendIds = new HashSet<>();
+
/**
* Constructs node to scan given data files of table 'tbl'.
*/
@@ -143,9 +146,22 @@ public void finalize(Analyzer analyzer) throws
UserException {
throw new UserException(e.getMessage());
}
+ computeStats(analyzer);
isFinalized = true;
}
+ @Override
+ public void computeStats(Analyzer analyzer) {
+ if (cardinality > 0) {
+ avgRowSize = totalBytes / (float) cardinality;
+ if (hasLimit()) {
+ cardinality = Math.min(cardinality, limit);
+ }
+ numNodes = scanBackendIds.size();
+ }
+ }
+
+
// private void analyzeVectorizedConjuncts(Analyzer analyzer) throws
InternalException {
// for (SlotDescriptor slot : desc.getSlots()) {
// for (Expr conjunct : conjuncts) {
@@ -434,6 +450,7 @@ private void addScanRangeLocations(Partition partition,
Collections.shuffle(replicas);
boolean tabletIsNull = true;
+ boolean collectedStat = false;
for (Replica replica : replicas) {
Backend backend =
Catalog.getCurrentSystemInfo().getBackend(replica.getBackendId());
if (backend == null) {
@@ -447,6 +464,14 @@ private void addScanRangeLocations(Partition partition,
scanRangeLocations.addToLocations(scanRangeLocation);
paloRange.addToHosts(new TNetworkAddress(ip, port));
tabletIsNull = false;
+
+ //for CBO
+ if (!collectedStat && replica.getRowCount() != -1) {
+ cardinality += replica.getRowCount();
+ totalBytes += replica.getDataSize();
+ collectedStat = true;
+ }
+ scanBackendIds.add(backend.getId());
}
if (tabletIsNull) {
throw new UserException(tabletId + "have no alive replicas");
@@ -599,6 +624,18 @@ protected String getNodeExplainString(String prefix,
TExplainLevel detailLevel)
"buckets=%s/%s", selectedTabletsNum, totalTabletsNum));
output.append("\n");
+ output.append(prefix).append(String.format(
+ "cardinality=%s", cardinality));
+ output.append("\n");
+
+ output.append(prefix).append(String.format(
+ "avgRowSize=%s", avgRowSize));
+ output.append("\n");
+
+ output.append(prefix).append(String.format(
+ "numNodes=%s", numNodes));
+ output.append("\n");
+
return output.toString();
}
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