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new 3f9d83359c4 [opt](mtmv) Add log when compute olap scan cost to locate
problem easier (#45948)
3f9d83359c4 is described below
commit 3f9d83359c466a9aaa16ec0579f47bcbbc46c2d6
Author: seawinde <w...@selectdb.com>
AuthorDate: Thu Jan 2 16:22:52 2025 +0800
[opt](mtmv) Add log when compute olap scan cost to locate problem easier
(#45948)
### What problem does this PR solve?
Some mv test case should be chosen by cbo but not.
Add log when compute olap scan cost to locate problem easier
---
.../src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java | 4 ++++
1 file changed, 4 insertions(+)
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java
index f549b216217..e2909317ba1 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java
@@ -495,8 +495,12 @@ public class StatsCalculator extends
DefaultPlanVisitor<Statistics, Void> {
// mv is selected, return its estimated stats
Optional<Statistics> optStats =
cascadesContext.getStatementContext()
.getStatistics(((Relation) olapScan).getRelationId());
+ LOG.info("computeOlapScan optStats isPresent {}, tableRowCount is
{}",
+ optStats.isPresent(), tableRowCount);
if (optStats.isPresent()) {
double selectedPartitionsRowCount =
getSelectedPartitionRowCount(olapScan, tableRowCount);
+ LOG.info("computeOlapScan optStats is {},
selectedPartitionsRowCount is {}", optStats.get(),
+ selectedPartitionsRowCount);
// if estimated mv rowCount is more than actual row count,
fall back to base table stats
if (selectedPartitionsRowCount >=
optStats.get().getRowCount()) {
Statistics derivedStats = optStats.get();
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