morrySnow commented on code in PR #16114:
URL: https://github.com/apache/doris/pull/16114#discussion_r1082166380
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/logical/MergeLimits.java:
##########
@@ -43,11 +42,11 @@
public class MergeLimits extends OneRewriteRuleFactory {
@Override
public Rule build() {
- return
logicalLimit(logicalLimit()).whenNot(Limit::hasValidOffset).then(upperLimit -> {
+ return logicalLimit(logicalLimit()).then(upperLimit -> {
LogicalLimit<? extends Plan> bottomLimit = upperLimit.child();
return new LogicalLimit<>(
Math.min(upperLimit.getLimit(), bottomLimit.getLimit()),
- bottomLimit.getOffset(),
+ bottomLimit.getOffset() + upperLimit.getOffset(),
bottomLimit.child()
Review Comment:
only sum offset is not right
consider this scene:
before merge:
limit(limit = 7, offset = 5)
+-- limit(limit = 10, offset = 5)
after bottom limit, we get tuple from 6 to 15
after top limit, we get tuple from 11 to 15
so, after merge, we should get:
limit(limit = 5, offset = 10)
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