hanyuzheng7 commented on code in PR #22730:
URL: https://github.com/apache/flink/pull/22730#discussion_r1223301793
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinitions.java:
##########
@@ -272,6 +281,61 @@ ANY, and(logical(LogicalTypeRoot.BOOLEAN), LITERAL)
"org.apache.flink.table.runtime.functions.scalar.ArrayUnionFunction")
.build();
+ public static final BuiltInFunctionDefinition ARRAY_MAX =
+ BuiltInFunctionDefinition.newBuilder()
+ .name("ARRAY_MAX")
+ .kind(SCALAR)
+ .inputTypeStrategy(
+ new InputTypeStrategy() {
+ @Override
+ public ArgumentCount getArgumentCount() {
+ return ConstantArgumentCount.of(1);
+ }
+
+ @Override
+ public Optional<List<DataType>>
inferInputTypes(
+ CallContext callContext, boolean
throwOnFailure) {
+ DataType inputDataType =
+
callContext.getArgumentDataTypes().get(0);
+ if (!(inputDataType.getLogicalType()
instanceof ArrayType)) {
+ return Optional.empty();
+ }
+ DataType elementDataType =
+ ((CollectionDataType)
inputDataType)
+ .getElementDataType();
+ if (!Comparable.class.isAssignableFrom(
+
elementDataType.getConversionClass())) {
+ return Optional.empty();
+ }
+ return
Optional.of(callContext.getArgumentDataTypes());
+ }
+
+ @Override
+ public List<Signature> getExpectedSignatures(
+ FunctionDefinition definition) {
+ return Collections.singletonList(
+ Signature.of(
+
Signature.Argument.of("<ARRAY<COMPARABLE>>")));
+ }
+ })
+ .outputTypeStrategy(
+ new TypeStrategy() {
Review Comment:
ok
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