morrySnow commented on code in PR #27225:
URL: https://github.com/apache/doris/pull/27225#discussion_r1407049800
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/cost/CostModelV1.java:
##########
@@ -299,7 +303,29 @@ public Cost visitPhysicalHashJoin(
0
);
}
- return CostV1.of(context.getSessionVariable(), leftRowCount +
rightRowCount + outputRowCount,
+ double penaltyForShuffleSingleProbeBucket = 1.0;
+ for (Expression conj : physicalHashJoin.getHashJoinConjuncts()) {
+ EqualTo eq = (EqualTo) JoinUtils.swapEqualToForChildrenOrder(
+ (EqualTo) conj, physicalHashJoin.left().getOutputSet());
+ ColumnStatistic leftColStats =
probeStats.findColumnStatistics(eq.left());
+ if (leftColStats != null) {
+ if (leftColStats.ndv < beNumber) {
+ penaltyForShuffleSingleProbeBucket = 10;
Review Comment:
why 10?
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