snuyanzin commented on code in PR #26704:
URL: https://github.com/apache/flink/pull/26704#discussion_r2157531803


##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/functions/StructuredFunctionsITCase.java:
##########
@@ -88,14 +97,60 @@ Stream<TestSetSpec> getTestSetSpecs() {
                                 DataTypes.BOOLEAN()));
     }
 
+    private static @NotNull Stream<TestSetSpec> objectOfTestCases() {
+        return Stream.of(
+                TestSetSpec.forFunction(BuiltInFunctionDefinitions.OBJECT_OF)
+                        .onFieldsWithData(42, "Bob")
+                        .andDataTypes(DataTypes.INT(), DataTypes.STRING())
+                        .withFunction(Type1.Type1Constructor.class)
+                        .withFunction(Type2.Type2Constructor.class)
+                        .withFunction(NestedType.NestedConstructor.class)
+                        // Test with OBJECT_OF
+                        .testResult(
+                                objectOf(Type1.class, "a", 42, "b", "Bob"),
+                                "OBJECT_OF('" + Type1.class.getName() + "', 
'a', 42, 'b', 'Bob')",
+                                Row.of(42, "Bob"),
+                                DataTypes.STRUCTURED(
+                                        Type1.class,
+                                        DataTypes.FIELD("a", DataTypes.INT()),
+                                        DataTypes.FIELD("b", 
DataTypes.STRING())))
+                        // Test with same value from function
+                        .testSqlResult(
+                                "Type1Constructor(f0, f1) = OBJECT_OF('"
+                                        + Type1.class.getName()
+                                        + "', 'a', 42, 'b', 'Bob')",
+                                true,
+                                DataTypes.BOOLEAN())
+                        // Test with nested structured types
+                        .testSqlResult(
+                                "NestedConstructor(Type1Constructor(f0, f1), 
Type2Constructor(15, 'Alice')) = "
+                                        + "OBJECT_OF('"
+                                        + NestedType.class.getName()
+                                        + "', 'n1', OBJECT_OF('"
+                                        + Type1.class.getName()
+                                        + "', 'a', 42, 'b', 'Bob'), "
+                                        + "'n2', OBJECT_OF('"
+                                        + Type2.class.getName()
+                                        + "', 'a', 15, 'b', 'Alice'))",

Review Comment:
   not sure if it was missed during PTF implementation
   will it work with `record` s?
   Asking since we have a dedicated folder for java17 tests 
   for instance 
https://github.com/apache/flink/blob/1c34ca011cacdbb3b0f48b485eac89dd913d29bf/flink-tests-java17/src/test/java/org/apache/flink/api/java/typeutils/runtime/PojoRecordSerializerUpgradeTestSpecifications.java#L134



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