autophagy commented on code in PR #28212:
URL: https://github.com/apache/flink/pull/28212#discussion_r3281068369
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docs/content.zh/docs/dev/table/functions/ptfs.md:
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@@ -2275,6 +2275,110 @@ void testScalarOnly() throws Exception {
{{< /tab >}}
{{< /tabs >}}
+#### Testing with State
+
+The harness supports structured types, `ListView`, and `MapView`:
+
+{{< tabs "state-testing" >}}
+{{< tab "Java" >}}
+```java
+@DataTypeHint("ROW<name STRING, count BIGINT>")
+public class CounterPTF extends ProcessTableFunction<Row> {
+ public static class CountState {
+ public long count = 0L;
+ }
+
+ public void eval(
+ @StateHint CountState state,
+ @ArgumentHint(ArgumentTrait.SET_SEMANTIC_TABLE) Row input) {
+ state.count++;
+ String name = input.getFieldAs("name");
+ collect(Row.of(name, state.count));
+ }
+}
+
+@Test
+void testWithState() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(CounterPTF.class)
+ .withTableArgument("input", DataTypes.of("ROW<name STRING, value INT>"))
+ .withPartitionBy("input", "name")
+ .build()) {
+
+ harness.processElement(Row.of("Alice", 10));
+ harness.processElement(Row.of("Alice", 20));
+
+ List<Row> output = harness.getOutput();
+ assertThat(output.get(0)).isEqualTo(Row.of("Alice", 1L));
+ assertThat(output.get(1)).isEqualTo(Row.of("Alice", 2L));
Review Comment:
Oops, yes! You are right
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