924060929 commented on code in PR #43546:
URL: https://github.com/apache/doris/pull/43546#discussion_r2163102150
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fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java:
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@@ -412,11 +423,9 @@ private ColumnStatistic
getColumnStatsFromTableCache(CatalogRelation catalogRela
/**
* if get partition col stats failed, then return table level col stats
*/
- private ColumnStatistic
getColumnStatsFromPartitionCacheOrTableCache(OlapScan catalogRelation,
SlotReference slot,
- List<String> partitionNames) {
- long idxId = catalogRelation.getSelectedIndexId();
-
- return getColumnStatistic(catalogRelation.getTable(), slot.getName(),
idxId, partitionNames);
+ private ColumnStatistic getColumnStatsFromPartitionCacheOrTableCache(
+ OlapTableStatistics olapTableStats, SlotReference slot,
List<String> partitionNames) {
+ return getColumnStatistic(olapTableStats, slot.getName(),
partitionNames);
Review Comment:
because the `selectIndexId` already exists in `OlapTableStatistics`.
the core idea is: we need find table first, and then compute ColumnStatistic
multiple times for lots of columns in this table.
the old code is: find table for every column, this is too cost, so I split
it to two phase:
1. compute OlapTableStatistics first
2. reuse OlapTableStatistics to compute ColumnStatistic.
the new code only find table one time
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