sohardforaname commented on code in PR #13949:
URL: https://github.com/apache/doris/pull/13949#discussion_r1012672627
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fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/RuntimeFilterContext.java:
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@@ -62,8 +61,10 @@ public class RuntimeFilterContext {
private final Map<PhysicalHashJoin, List<RuntimeFilter>>
runtimeFilterOnHashJoinNode = Maps.newHashMap();
- // Alias's child to itself.
- private final Map<Slot, NamedExpression> aliasChildToSelf =
Maps.newHashMap();
+ // alias -> alias's child, if there's a key that is alias's child, the
key-value will change by this way
+ // Alias(A) = B, now B -> A in map, and encounter Alias(B) -> C, the kv
will be C -> A.
+ // you can see disjoint set data structure to learn the processing
detailed.
+ private final Map<NamedExpression, Pair<RelationId, NamedExpression>>
aliasTransferMap = Maps.newHashMap();
Review Comment:
no, because we change key at visitPhysicalProject, use pair as key may be
more complex.
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