Kikyou1997 commented on code in PR #11802:
URL: https://github.com/apache/doris/pull/11802#discussion_r946857050
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/Avg.java:
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@@ -18,25 +18,46 @@
package org.apache.doris.nereids.trees.expressions.functions;
import org.apache.doris.nereids.trees.expressions.Expression;
-import org.apache.doris.nereids.trees.expressions.UnaryExpression;
+import org.apache.doris.nereids.trees.expressions.shape.UnaryExpression;
+import
org.apache.doris.nereids.trees.expressions.typecoercion.ImplicitCastInputTypes;
import org.apache.doris.nereids.types.DataType;
+import org.apache.doris.nereids.types.DateTimeType;
+import org.apache.doris.nereids.types.DateType;
+import org.apache.doris.nereids.types.DecimalType;
import org.apache.doris.nereids.types.DoubleType;
+import org.apache.doris.nereids.types.NumericType;
import org.apache.doris.nereids.types.VarcharType;
+import org.apache.doris.nereids.types.coercion.AbstractDataType;
+import org.apache.doris.nereids.types.coercion.TypeCollection;
import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
import java.util.List;
/** avg agg function. */
-public class Avg extends AggregateFunction implements UnaryExpression {
+public class Avg extends AggregateFunction implements UnaryExpression,
ImplicitCastInputTypes {
+
+ private static final List<AbstractDataType> EXPECTED_INPUT_TYPES =
ImmutableList.of(
+ new TypeCollection(NumericType.INSTANCE, DateTimeType.INSTANCE,
DateType.INSTANCE)
+ );
public Avg(Expression child) {
super("avg", child);
}
@Override
public DataType getDataType() {
- return DoubleType.INSTANCE;
+ if (child().getDataType() instanceof DecimalType) {
+ DecimalType childType = (DecimalType) child().getDataType();
+ return DecimalType.createDecimalType(childType.getPrecision(),
childType.getScale());
Review Comment:
why not return child type directly
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