xzj7019 commented on code in PR #24630:
URL: https://github.com/apache/doris/pull/24630#discussion_r1332597512
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/SubExprAnalyzer.java:
##########
@@ -72,7 +73,13 @@ public Expression visitNot(Not not, CascadesContext context)
{
@Override
public Expression visitExistsSubquery(Exists exists, CascadesContext
context) {
AnalyzedResult analyzedResult = analyzeSubquery(exists);
-
+ if (analyzedResult.rootIsLimitZero()) {
+ return BooleanLiteral.of(exists.isNot());
+ }
+ if (analyzedResult.isCorrelated() &&
analyzedResult.rootIsLimitWithOffset()) {
+ throw new AnalysisException("Unsupported correlated subquery with
a LIMIT clause with offset > 0 "
Review Comment:
select * from t1 where not exists (select * from t2 where t1.c1 = t2.c1
limit 0 offset 1);
Means doris will throw exception ? I think it makes sence to return full set
of t1.
and for exists, it returns empty sets also.
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