leonardBang commented on a change in pull request #16020:
URL: https://github.com/apache/flink/pull/16020#discussion_r671707964
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinitions.java
##########
@@ -283,6 +283,26 @@
.outputTypeStrategy(nullable(explicit(DataTypes.BOOLEAN())))
.build();
+ public static final BuiltInFunctionDefinition GREATEST =
+ BuiltInFunctionDefinition.newBuilder()
+ .name("greatest")
+ .kind(SCALAR)
+ .inputTypeStrategy(
+ comparable(ConstantArgumentCount.from(1),
StructuredComparision.FULL))
+ .outputTypeStrategy(nullable(TypeStrategies.COMMON))
Review comment:
IIUC, ` nullable(TypeStrategy initialStrategy)` has done for this?
```
/**
* A type strategy that can be used to make a result type nullable if
any of the input arguments
* is nullable. Otherwise the type will be not null.
*/
public static TypeStrategy nullable(TypeStrategy initialStrategy) {
return nullable(ConstantArgumentCount.any(), initialStrategy);
}
```
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