morrySnow commented on code in PR #14964:
URL: https://github.com/apache/doris/pull/14964#discussion_r1059276593
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/agg/Min.java:
##########
@@ -32,15 +31,19 @@
import java.util.List;
/** min agg function. */
-public class Min extends AggregateFunction implements UnaryExpression,
PropagateNullable, CustomSignature,
+public class Min extends NullableAggregateFunction implements UnaryExpression,
CustomSignature,
ForbiddenMetricTypeArguments {
public Min(Expression child) {
- super("min", child);
+ this(false, false, child);
}
public Min(boolean isDistinct, Expression arg) {
- super("min", false, arg);
+ this(isDistinct, false, arg);
+ }
+
+ public Min(boolean isDistinct, boolean isAlwaysNullable, Expression arg) {
+ super("min", isAlwaysNullable, isDistinct, arg);
Review Comment:
maybe all alwaysnullable constructor should be private
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/FillUpMissingSlots.java:
##########
@@ -171,6 +172,9 @@ public void resolve(Expression expression) {
throw new AnalysisException("Aggregate functions in
having clause can't be nested: "
+ expression.toSql() + ".");
}
+ if (groupByExpressions.isEmpty() && expression instanceof
NullableAggregateFunction) {
+ expression = ((NullableAggregateFunction)
expression).withAlwaysNullable(true);
+ }
Review Comment:
chould we make a new rule to process nullable only?
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