morrySnow commented on code in PR #51127:
URL: https://github.com/apache/doris/pull/51127#discussion_r2101777618
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/cost/CostModelV1.java:
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@@ -559,9 +559,13 @@ public Cost visitPhysicalNestedLoopJoin(
Preconditions.checkState(context.arity() == 2);
Statistics leftStatistics = context.getChildStatistics(0);
Statistics rightStatistics = context.getChildStatistics(1);
+ double nljPenalty = 1.0;
+ if (leftStatistics.getRowCount() < 10 * rightStatistics.getRowCount())
{
+ nljPenalty = Math.min(leftStatistics.getRowCount(),
rightStatistics.getRowCount());
+ }
Review Comment:
add comment to explain the effect of the penalty
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