xzj7019 commented on code in PR #31854:
URL: https://github.com/apache/doris/pull/31854#discussion_r1515404530
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/ConvertOuterJoinToAntiJoin.java:
##########
@@ -73,36 +66,29 @@ private Plan
toAntiJoin(LogicalProject<LogicalFilter<LogicalJoin<Plan, Plan>>> p
.filter(s -> alwaysNullSlots.contains(s) && !s.nullable())
.collect(Collectors.toSet());
- Plan res = project;
- if (join.getJoinType().isLeftOuterJoin() &&
!rightAlwaysNullSlots.isEmpty() && leftOutput) {
- // When there is right slot always null, we can turn left outer
join to left anti join
- Set<Expression> predicates = filter.getExpressions().stream()
- .filter(p -> !(TypeUtils.isNull(p).isPresent()
- &&
rightAlwaysNullSlots.containsAll(p.getInputSlots())))
- .collect(ImmutableSet.toImmutableSet());
- boolean containRightSlot = predicates.stream()
- .flatMap(p -> p.getInputSlots().stream())
- .anyMatch(join.right().getOutputSet()::contains);
- if (!containRightSlot) {
- res = join.withJoinType(JoinType.LEFT_ANTI_JOIN,
join.getJoinReorderContext());
- res = predicates.isEmpty() ? res :
filter.withConjuncts(predicates).withChildren(res);
- res = project.withChildren(res);
- }
+ Plan newJoin = null;
+ if (join.getJoinType().isLeftOuterJoin() &&
!rightAlwaysNullSlots.isEmpty()) {
+ newJoin = join.withJoinType(JoinType.LEFT_ANTI_JOIN,
join.getJoinReorderContext());
}
- if (join.getJoinType().isRightOuterJoin() &&
!leftAlwaysNullSlots.isEmpty() && rightOutput) {
- Set<Expression> predicates = filter.getExpressions().stream()
- .filter(p -> !(TypeUtils.isNull(p).isPresent()
- &&
leftAlwaysNullSlots.containsAll(p.getInputSlots())))
- .collect(ImmutableSet.toImmutableSet());
- boolean containLeftSlot = predicates.stream()
- .flatMap(p -> p.getInputSlots().stream())
- .anyMatch(join.left().getOutputSet()::contains);
- if (!containLeftSlot) {
- res = join.withJoinType(JoinType.RIGHT_ANTI_JOIN,
join.getJoinReorderContext());
- res = predicates.isEmpty() ? res :
filter.withConjuncts(predicates).withChildren(res);
- res = project.withChildren(res);
- }
+ if (join.getJoinType().isRightOuterJoin() &&
!leftAlwaysNullSlots.isEmpty()) {
+ newJoin = join.withJoinType(JoinType.RIGHT_ANTI_JOIN,
join.getJoinReorderContext());
+ }
+ if (newJoin == null) {
+ return null;
+ }
+
+ if (!newJoin.getOutputSet().containsAll(filter.getInputSlots())) {
Review Comment:
pls add comment to explain the cases to handle
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