jackwener commented on code in PR #10479:
URL: https://github.com/apache/doris/pull/10479#discussion_r920957774
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/exploration/join/JoinCommutative.java:
##########
@@ -50,11 +51,54 @@ enum SwapType {
@Override
public Rule<Plan> build() {
- return innerLogicalJoin().then(join -> new LogicalJoin(
- join.getJoinType().swap(),
- join.getCondition(),
- join.right(),
- join.left())
- ).toRule(RuleType.LOGICAL_JOIN_COMMUTATIVE);
+ return innerLogicalJoin().then(join -> {
+ if (check(join)) {
+ return null;
+ }
+ boolean isBottomJoin = isBottomJoin(join);
+ if (swapType == SwapType.BOTTOM_JOIN && !isBottomJoin) {
+ return null;
+ }
+
+ LogicalJoin newJoin = new LogicalJoin(
+ join.getJoinType(),
+ join.getCondition(),
+ join.right(), join.left()
+ );
+
newJoin.getJoinReorderContext().copyFrom(join.getJoinReorderContext());
+ newJoin.getJoinReorderContext().setHasCommute(true);
+ if (swapType == SwapType.ZIG_ZAG && !isBottomJoin) {
+ newJoin.getJoinReorderContext().setHasCommuteZigZag(true);
+ }
+
+ return newJoin;
+ }).toRule(RuleType.LOGICAL_JOIN_COMMUTATIVE);
+ }
+
+
+ private boolean check(LogicalJoin join) {
+ if (join.getJoinReorderContext().hasCommute() ||
join.getJoinReorderContext().hasExchange()) {
+ return false;
+ }
+ return true;
+ }
+
+ private boolean isBottomJoin(LogicalJoin join) {
+ if (join.left() instanceof LogicalProject) {
Review Comment:
Great👍
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