englefly commented on code in PR #21772:
URL: https://github.com/apache/doris/pull/21772#discussion_r1261852513
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/stats/ExpressionEstimation.java:
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@@ -140,12 +143,38 @@ public ColumnStatistic visitCaseWhen(CaseWhen caseWhen,
Statistics context) {
return columnStat.build();
}
+ @Override
public ColumnStatistic visitCast(Cast cast, Statistics context) {
ColumnStatistic stats = context.findColumnStatistics(cast);
if (stats != null) {
return stats;
}
- return cast.child().accept(this, context);
+ ColumnStatistic childColStats = cast.child().accept(this, context);
+
+ return castMinMax(childColStats, cast.getDataType());
+ }
+
+ private ColumnStatistic castMinMax(ColumnStatistic colStats, DataType
targetType) {
+ if (colStats.minExpr instanceof StringLiteral &&
targetType.isDateLikeType()) {
Review Comment:
yes. this function should be expanded!
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