seawinde commented on code in PR #35436:
URL: https://github.com/apache/doris/pull/35436#discussion_r1616491885
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fe/fe-core/src/main/java/org/apache/doris/nereids/StatementContext.java:
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@@ -149,6 +152,10 @@ public class StatementContext implements Closeable {
// Record table id mapping, the key is the hash code of union catalogId,
databaseId, tableId
// the value is the auto-increment id in the cascades context
private final Map<TableIdentifier, TableId> tableIdMapping = new
LinkedHashMap<>();
+ // Record the materialization statistics by id which is used for cost
estimation.
+ // Maybe return null, which means the id according statistics should calc
normally rather than getting
+ // form this map
+ private final Map<RelationId, Statistics> relationIdToStatisticsMap = new
LinkedHashMap<>();
Review Comment:
selectedIndex is a new scan, relationId is different from original scan,
should be also getted from the `relationIdToStatisticsMap`
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