autophagy commented on code in PR #27928:
URL: https://github.com/apache/flink/pull/27928#discussion_r3217411510
##########
docs/content.zh/docs/dev/table/functions/ptfs.md:
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@@ -2034,3 +2034,336 @@ Limitations
PTFs are in an early stage. The following limitations apply:
- PTFs cannot run in batch mode.
- Broadcast state
+
+Testing Process Table Functions
+-------------------------------
+
+The `ProcessTableFunctionTestHarness` provides a lightweight unit testing
framework for Process Table
+Functions (PTFs). It is useful for unit testing and validating PTF business
logic, multi-table PTF
+behaviour and validating errors.
+
+For end-to-end integration testing with the full Flink planner and runtime,
use integration tests
+instead.
+
+{{< top >}}
+
+### Quick Start
+
+{{< tabs "quickstart" >}}
+{{< tab "Java" >}}
+```java
+import org.apache.flink.table.annotation.*;
+import org.apache.flink.table.api.DataTypes;
+import org.apache.flink.table.functions.ProcessTableFunction;
+import
org.apache.flink.table.runtime.functions.ProcessTableFunctionTestHarness;
+import org.apache.flink.types.Row;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+// PTF under test
+@DataTypeHint("ROW<doubled INT>")
+public class DoublePTF extends ProcessTableFunction<Row> {
+ public void eval(@ArgumentHint(ArgumentTrait.ROW_SEMANTIC_TABLE) Row input) {
+ int value = input.getFieldAs("value");
+ collect(Row.of(value * 2));
+ }
+}
+
+// Test
+@Test
+void testDoublePTF() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(DoublePTF.class)
+ .withTableArgument("input", DataTypes.of("ROW<value INT>"))
+ .build()) {
+
+ harness.processElement(Row.of(5));
+ harness.processElement(Row.of(10));
+
+ List<Row> output = harness.getOutput();
+ assertThat(output).hasSize(2);
+ assertThat(output.get(0)).isEqualTo(Row.of(10));
+ assertThat(output.get(1)).isEqualTo(Row.of(20));
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+{{< top >}}
+
+### Common Testing Scenarios
+
+#### Testing Row-Semantic Tables
+
+Use `.withTableArgument()` to configure the input table schema:
+
+{{< tabs "row-semantic" >}}
+{{< tab "Java" >}}
+```java
+public class PassthroughPTF extends ProcessTableFunction<Integer> {
+ public void eval(@ArgumentHint(ArgumentTrait.ROW_SEMANTIC_TABLE) Row input) {
+ collect(input.getFieldAs("value"));
+ }
+}
+
+@Test
+void testPassthrough() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(PassthroughPTF.class)
+ .withTableArgument("input", DataTypes.of("ROW<value INT>"))
+ .build()) {
+
+ harness.processElement(Row.of(42));
+ harness.processElement(Row.of(100));
+
+ List<Row> output = harness.getOutput();
+ assertThat(output).containsExactly(42, 100);
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+#### Testing Set-Semantic Tables with Partitioning
+
+For `SET_SEMANTIC_TABLE`, use `.withPartitionBy()` to configure partition
columns:
+
+{{< tabs "set-semantic" >}}
+{{< tab "Java" >}}
+```java
+@DataTypeHint("ROW<doubled INT>")
+public class PartitionedPTF extends ProcessTableFunction<Row> {
+ public void eval(@ArgumentHint(ArgumentTrait.SET_SEMANTIC_TABLE) Row input) {
+ int value = input.getFieldAs("value");
+ collect(Row.of(value * 2));
+ }
+}
+
+@Test
+void testPartitionedPTF() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(PartitionedPTF.class)
+ .withTableArgument("input", DataTypes.of("ROW<key STRING, value
INT>"))
+ .withPartitionBy("input", "key")
+ .build()) {
+
+ harness.processElement(Row.of("A", 10));
+ harness.processElement(Row.of("B", 20));
+
+ List<Row> output = harness.getOutput();
+ assertThat(output.get(0)).isEqualTo(Row.of("A", 20));
+ assertThat(output.get(1)).isEqualTo(Row.of("B", 40));
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+#### Testing Multiple Table Arguments
+
+Use `processElementForTable()` to specify which table receives each row:
+
+{{< tabs "multi-table" >}}
+{{< tab "Java" >}}
+```java
+@DataTypeHint("ROW<output STRING>")
+public class JoinPTF extends ProcessTableFunction<Row> {
+ public void eval(
+ @ArgumentHint(ArgumentTrait.SET_SEMANTIC_TABLE) Row left,
+ @ArgumentHint(ArgumentTrait.SET_SEMANTIC_TABLE) Row right) {
+ if (left != null) {
+ collect(Row.of("LEFT: " + left));
+ }
+ if (right != null) {
+ collect(Row.of("RIGHT: " + right));
+ }
+ }
+}
+
+@Test
+void testMultiTable() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(JoinPTF.class)
+ .withTableArgument("left", DataTypes.of("ROW<id INT, name STRING>"))
+ .withPartitionBy("left", "id")
+ .withTableArgument("right", DataTypes.of("ROW<id INT, city STRING>"))
+ .withPartitionBy("right", "id")
+ .build()) {
+
+ // Use processElementForTable() to target specific tables
+ harness.processElementForTable("left", Row.of(1, "Alice"));
+ harness.processElementForTable("right", Row.of(1, "Berlin"));
+
+ List<Row> output = harness.getOutput();
+ assertThat(output.get(0)).isEqualTo(Row.of(1, null, "LEFT: +I[1, Alice]"));
+ assertThat(output.get(1)).isEqualTo(Row.of(null, 1, "RIGHT: +I[1,
Berlin]"));
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+#### Testing with Scalar Arguments
+
+Use `.withScalarArgument()` to configure scalar parameter values:
+
+{{< tabs "scalar-args" >}}
+{{< tab "Java" >}}
+```java
+@DataTypeHint("ROW<value INT>")
+public class FilterPTF extends ProcessTableFunction<Row> {
+ public void eval(
+ @ArgumentHint(ArgumentTrait.ROW_SEMANTIC_TABLE) Row input,
+ int threshold) {
+ int value = input.getFieldAs("value");
+ if (value > threshold) {
+ collect(Row.of(value));
+ }
+ }
+}
+
+@Test
+void testFilter() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(FilterPTF.class)
+ .withTableArgument("input", DataTypes.of("ROW<value INT>"))
+ .withScalarArgument("threshold", 50) // Configure scalar value
+ .build()) {
+
+ harness.processElement(Row.of(30));
+ harness.processElement(Row.of(70));
+
+ List<Row> output = harness.getOutput();
+ assertThat(output).containsExactly(Row.of(70));
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+**Scalar-Only PTFs**: For PTFs with only scalar arguments, use `process()` to
trigger evaluation:
+
+{{< tabs "scalar-only" >}}
+{{< tab "Java" >}}
+```java
+@DataTypeHint("ROW<sum INT>")
+public class AddPTF extends ProcessTableFunction<Row> {
+ public void eval(int a, int b) {
+ collect(Row.of(a + b));
+ }
+}
+
+@Test
+void testScalarOnly() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(AddPTF.class)
+ .withScalarArgument("a", 5)
+ .withScalarArgument("b", 7)
+ .build()) {
+
+ harness.process(); // Use process() instead of processElement()
+
+ List<Row> output = harness.getOutput();
+ assertThat(output).containsExactly(Row.of(12));
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+#### Configuring Table Argument Types
+
+The harness supports two ways to specify table argument types:
+
+{{< tabs "type-config" >}}
+{{< tab "Java" >}}
+```java
+// Option 1: Inline type annotation using DataTypeHint
+@DataTypeHint("ROW<doubled INT>")
+public class InlineTypePTF extends ProcessTableFunction<Row> {
+ public void eval(
+ @ArgumentHint(
+ value = ArgumentTrait.ROW_SEMANTIC_TABLE,
+ type = @DataTypeHint("ROW<value INT>")
+ ) Row input) {
+ int value = input.getFieldAs("value");
+ collect(Row.of(value * 2));
+ }
+}
+
+@Test
+void testInlineType() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(InlineTypePTF.class).build()) {
+
+ harness.processElement(Row.of(5));
+ assertThat(harness.getOutput()).containsExactly(Row.of(10));
+ }
+}
+
+// Option 2: Builder configuration
+@Test
+void testBuilderType() throws Exception {
+ try (ProcessTableFunctionTestHarness<Row> harness =
+ ProcessTableFunctionTestHarness.ofClass(DoublePTF.class)
+ .withTableArgument("input", DataTypes.of("ROW<value INT>"))
+ .build()) {
+
+ harness.processElement(Row.of(5));
+ assertThat(harness.getOutput()).containsExactly(Row.of(10));
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+**Structured Types**: The harness supports structured POJO types in addition
to `Row`, both as PTF inputs
+and outputs:
+
+{{< tabs "pojo-types" >}}
+{{< tab "Java" >}}
+```java
+public static class Customer {
+ public String name;
+ public int age;
+}
+
+public class CustomerPTF extends ProcessTableFunction<Customer> {
+ public void eval(@ArgumentHint(ArgumentTrait.ROW_SEMANTIC_TABLE) Customer c)
{
+ collect(c);
+ }
+}
+
+@Test
+void testPOJO() throws Exception {
+ try (ProcessTableFunctionTestHarness<Customer> harness =
+ ProcessTableFunctionTestHarness.ofClass(CustomerPTF.class)
+ .withTableArgument("input", DataTypes.of(Customer.class))
+ .build()) {
+
+ harness.processElement(Row.of("Alice", 30));
+
+ List<Customer> output = harness.getOutput();
+ assertThat(output.get(0).name).isEqualTo("Alice");
+ assertThat(output.get(0).age).isEqualTo(30);
+ }
+}
+```
+{{< /tab >}}
+{{< /tabs >}}
+
+{{< top >}}
+
+### Unsupported Features
Review Comment:
Oops, thank you for the pointer 😅 Yeah, a silly mistake from merging the
independent testing page into the general PTF page
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