hanyuzheng7 commented on code in PR #22917:
URL: https://github.com/apache/flink/pull/22917#discussion_r1247910219
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flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/SpecificTypeStrategies.java:
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@@ -58,8 +58,12 @@ public final class SpecificTypeStrategies {
/** See {@link ArrayTypeStrategy}. */
public static final TypeStrategy ARRAY = new ArrayTypeStrategy();
- /** See {@link ArrayElementOutputTypeStrategy}. */
- public static final TypeStrategy ARRAY_ELEMENT = new
ArrayElementOutputTypeStrategy();
+ /** Type strategy specific for array element. */
+ public static final TypeStrategy ARRAY_ELEMENT =
+ callContext ->
+ Optional.of(
Review Comment:
It seem the return in this class is always nullable. so why you change it?
```
/** Specific {@link TypeStrategy} for {@link
BuiltInFunctionDefinitions#ARRAY_MAX}. */
@Internal
public class ArrayElementOutputTypeStrategy implements TypeStrategy {
@Override
public Optional<DataType> inferType(CallContext callContext) {
DataType inputDataType = callContext.getArgumentDataTypes().get(0);
if (inputDataType.getLogicalType().getTypeRoot() !=
LogicalTypeRoot.ARRAY) {
return Optional.empty();
}
final DataType elementDataType = ((CollectionDataType)
inputDataType).getElementDataType();
if (inputDataType.getLogicalType().isNullable()) {
return Optional.of(elementDataType.nullable());
} else {
return Optional.of(elementDataType);
}
}
}
```
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