englefly commented on code in PR #20341:
URL: https://github.com/apache/doris/pull/20341#discussion_r1213824173
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fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java:
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@@ -551,6 +551,11 @@ private Statistics computeScan(Scan scan) {
throw new RuntimeException(String.format("Invalid slot: %s",
slotReference.getExprId()));
}
ColumnStatistic cache = Config.enable_stats ?
getColumnStatistic(table, colName) : ColumnStatistic.UNKNOWN;
+ if (cache.avgSizeByte <= 0) {
Review Comment:
The avgSizeByte means its size defined in schema. Even for UNKNOWN, its
avgSizeByte is available.
And this size is useful when we compute the cost of data transfer, given a
schema defined size is better than Zero.
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