z3d1k commented on code in PR #152:
URL: 
https://github.com/apache/flink-connector-aws/pull/152#discussion_r1711207726


##########
flink-connector-aws/flink-connector-dynamodb/src/main/java/org/apache/flink/connector/dynamodb/table/RowDataToAttributeValueConverter.java:
##########
@@ -43,14 +47,35 @@ public class RowDataToAttributeValueConverter {
 
     private final DataType physicalDataType;
     private final TableSchema<RowData> tableSchema;
+    private final Set<String> primaryKeys;
 
-    public RowDataToAttributeValueConverter(DataType physicalDataType) {
+    public RowDataToAttributeValueConverter(DataType physicalDataType, 
Set<String> primaryKeys) {

Review Comment:
   Instead of duplicating logic, it will be better to call constructor with all 
parameters from one with defaults. This way there only 1 place to change if 
required:
   ```
       public RowDataToAttributeValueConverter(DataType physicalDataType) {
           this(physicalDataType, Collections.emptySet());
       }
   ```



##########
flink-connector-aws/flink-connector-dynamodb/src/test/java/org/apache/flink/connector/dynamodb/table/RowDataElementConverterTest.java:
##########
@@ -45,10 +48,17 @@ public class RowDataElementConverterTest {
                     DataTypes.FIELD("partition_key", DataTypes.STRING()),
                     DataTypes.FIELD("payload", DataTypes.STRING()));
     private static final RowDataElementConverter elementConverter =
-            new RowDataElementConverter(DATA_TYPE);
+            new RowDataElementConverter(DATA_TYPE, null);
     private static final SinkWriter.Context context = new 
UnusedSinkWriterContext();
     private static final RowDataToAttributeValueConverter 
rowDataToAttributeValueConverter =
-            new RowDataToAttributeValueConverter(DATA_TYPE);
+            new RowDataToAttributeValueConverter(DATA_TYPE, null);
+
+    private static final Set<String> primaryKeys =
+            new HashSet<>(Collections.singletonList("partition_key"));

Review Comment:
   nit: You can use `Collections.singleton(...)` to create Set (immutable) with 
a single element.



##########
flink-connector-aws/flink-connector-dynamodb/src/test/java/org/apache/flink/connector/dynamodb/table/RowDataToAttributeValueConverterTest.java:
##########
@@ -51,7 +58,7 @@ void testChar() {
 
         DataType dataType = DataTypes.ROW(DataTypes.FIELD(key, 
DataTypes.CHAR(9)));
         RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
-                new RowDataToAttributeValueConverter(dataType);
+                new RowDataToAttributeValueConverter(dataType, null);

Review Comment:
   Here and below, you can remove `null` argument since you've added 
constructor overload



##########
flink-connector-aws/flink-connector-dynamodb/src/test/java/org/apache/flink/connector/dynamodb/table/RowDataToAttributeValueConverterTest.java:
##########
@@ -547,12 +552,132 @@ void testInstantArray() {
         assertThat(actualResult).containsAllEntriesOf(expectedResult);
     }
 
+    @Test
+    void testDeleteOnlyPrimaryKey() {
+        String key = "key";
+        String value = "some_string";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = new 
HashSet<>(Collections.singletonList(key));
+
+        // Create a Row with two fields - "key" and "otherField".  "key" is 
the single primary key.
+        // For a Delete request, only "key" should be included in the 
expectedResult, and not "otherField".
+        DataType dataType = DataTypes.ROW(DataTypes.FIELD(key, 
DataTypes.STRING()), DataTypes.FIELD(otherField, DataTypes.STRING()));
+        RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
+                new RowDataToAttributeValueConverter(dataType, primaryKeys);
+        RowData rowData = 
createElementWithMultipleFields(StringData.fromString(value), 
StringData.fromString(otherValue));
+        rowData.setRowKind(RowKind.DELETE);
+
+        Map<String, AttributeValue> actualResult =
+                rowDataToAttributeValueConverter.convertRowData(rowData);
+        Map<String, AttributeValue> expectedResult =
+                singletonMap(key, AttributeValue.builder().s(value).build());
+
+        assertThat(actualResult).containsAllEntriesOf(expectedResult);
+        assertThat(expectedResult).containsAllEntriesOf(actualResult);
+    }
+
+    @Test
+    void testDeleteOnlyPrimaryKeys() {
+        String key = "key";
+        String value = "some_string";
+        String additionalKey = "additional_key";
+        String additionalValue = "additional_value";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = new HashSet<>();
+        primaryKeys.add(key);
+        primaryKeys.add(additionalKey);
+
+        // Create a Row with three fields - "key", "additional_key", and 
"otherField".
+        // "key" and "additional_key" make up the composite primary key.
+        // For a Delete request, only "key" and "additional_key" should be 
included in the expectedResult, and not "otherField".
+        DataType dataType = DataTypes.ROW(
+                DataTypes.FIELD(key, DataTypes.STRING()),
+                DataTypes.FIELD(additionalKey, DataTypes.STRING()),
+                DataTypes.FIELD(otherField, DataTypes.STRING()));
+        RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
+                new RowDataToAttributeValueConverter(dataType, primaryKeys);
+        RowData rowData = createElementWithMultipleFields(
+                StringData.fromString(value), 
StringData.fromString(additionalValue), StringData.fromString(otherValue));
+        rowData.setRowKind(RowKind.DELETE);
+
+        Map<String, AttributeValue> actualResult =
+                rowDataToAttributeValueConverter.convertRowData(rowData);
+        Map<String, AttributeValue> expectedResult = new HashMap<>();
+        expectedResult.put(key, AttributeValue.builder().s(value).build());
+        expectedResult.put(additionalKey, 
AttributeValue.builder().s(additionalValue).build());
+
+        assertThat(actualResult).containsAllEntriesOf(expectedResult);
+        assertThat(expectedResult).containsAllEntriesOf(actualResult);
+    }
+
+    @Test
+    void testPKIgnoredForInsert() {
+        String key = "key";
+        String value = "some_string";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = new 
HashSet<>(Collections.singletonList(key));
+
+        // Create a Row with two fields - "key" and "otherField".  "key" is 
the primary key.
+        // For an Insert request, all fields should be included regardless of 
the Primary Key.
+        DataType dataType = DataTypes.ROW(DataTypes.FIELD(key, 
DataTypes.STRING()), DataTypes.FIELD(otherField, DataTypes.STRING()));
+        RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
+                new RowDataToAttributeValueConverter(dataType, primaryKeys);
+        RowData rowData = 
createElementWithMultipleFields(StringData.fromString(value), 
StringData.fromString(otherValue));
+        rowData.setRowKind(RowKind.INSERT);
+
+        Map<String, AttributeValue> actualResult =
+                rowDataToAttributeValueConverter.convertRowData(rowData);
+        Map<String, AttributeValue> expectedResult = new HashMap<>();
+        expectedResult.put(key, AttributeValue.builder().s(value).build());
+        expectedResult.put(otherField, 
AttributeValue.builder().s(otherValue).build());
+
+        assertThat(actualResult).containsAllEntriesOf(expectedResult);

Review Comment:
   You can use `assertThat(...).containsExactlyInAnyOrderEntriesOf(...)` here 
to check that maps contain same elements without worrying about order.



##########
flink-connector-aws/flink-connector-dynamodb/src/test/java/org/apache/flink/connector/dynamodb/table/RowDataToAttributeValueConverterTest.java:
##########
@@ -547,12 +554,180 @@ void testInstantArray() {
         assertThat(actualResult).containsAllEntriesOf(expectedResult);
     }
 
+    @Test
+    void testDeleteExceptionWhenNoPrimaryKey() {
+        String key = "key";
+        String value = "some_string";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = Collections.emptySet();
+
+        // Create a Row with two fields - "key" and "otherField".  "key" is 
the single primary key.
+        DataType dataType =
+                DataTypes.ROW(
+                        DataTypes.FIELD(key, DataTypes.STRING()),
+                        DataTypes.FIELD(otherField, DataTypes.STRING()));
+        RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
+                new RowDataToAttributeValueConverter(dataType, primaryKeys);
+        RowData rowData =
+                createElementWithMultipleFields(
+                        StringData.fromString(value), 
StringData.fromString(otherValue));
+        rowData.setRowKind(RowKind.DELETE);
+
+        assertThrows(
+                TableException.class,
+                () -> {
+                    rowDataToAttributeValueConverter.convertRowData(rowData);
+                });
+    }
+
+    void testDeleteOnlyPrimaryKey() {
+        String key = "key";
+        String value = "some_string";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = new 
HashSet<>(Collections.singletonList(key));
+
+        // Create a Row with two fields - "key" and "otherField".  "key" is 
the single primary key.
+        // For a Delete request, only "key" should be included in the 
expectedResult, and not
+        // "otherField".
+        DataType dataType =
+                DataTypes.ROW(
+                        DataTypes.FIELD(key, DataTypes.STRING()),
+                        DataTypes.FIELD(otherField, DataTypes.STRING()));
+        RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
+                new RowDataToAttributeValueConverter(dataType, primaryKeys);
+        RowData rowData =
+                createElementWithMultipleFields(
+                        StringData.fromString(value), 
StringData.fromString(otherValue));
+        rowData.setRowKind(RowKind.DELETE);
+
+        Map<String, AttributeValue> actualResult =
+                rowDataToAttributeValueConverter.convertRowData(rowData);
+        Map<String, AttributeValue> expectedResult =
+                singletonMap(key, AttributeValue.builder().s(value).build());
+
+        assertThat(actualResult).containsAllEntriesOf(expectedResult);
+        assertThat(expectedResult).containsAllEntriesOf(actualResult);
+    }
+
+    @Test
+    void testDeleteOnlyPrimaryKeys() {
+        String key = "key";
+        String value = "some_string";
+        String additionalKey = "additional_key";
+        String additionalValue = "additional_value";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = new HashSet<>();
+        primaryKeys.add(key);
+        primaryKeys.add(additionalKey);
+
+        // Create a Row with three fields - "key", "additional_key", and 
"otherField".
+        // "key" and "additional_key" make up the composite primary key.
+        // For a Delete request, only "key" and "additional_key" should be 
included in the
+        // expectedResult, and not "otherField".
+        DataType dataType =
+                DataTypes.ROW(
+                        DataTypes.FIELD(key, DataTypes.STRING()),
+                        DataTypes.FIELD(additionalKey, DataTypes.STRING()),
+                        DataTypes.FIELD(otherField, DataTypes.STRING()));
+        RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
+                new RowDataToAttributeValueConverter(dataType, primaryKeys);
+        RowData rowData =
+                createElementWithMultipleFields(
+                        StringData.fromString(value),
+                        StringData.fromString(additionalValue),
+                        StringData.fromString(otherValue));
+        rowData.setRowKind(RowKind.DELETE);
+
+        Map<String, AttributeValue> actualResult =
+                rowDataToAttributeValueConverter.convertRowData(rowData);
+        Map<String, AttributeValue> expectedResult = new HashMap<>();
+        expectedResult.put(key, AttributeValue.builder().s(value).build());
+        expectedResult.put(additionalKey, 
AttributeValue.builder().s(additionalValue).build());
+
+        assertThat(actualResult).containsAllEntriesOf(expectedResult);
+        assertThat(expectedResult).containsAllEntriesOf(actualResult);
+    }
+
+    @Test
+    void testPKIgnoredForInsert() {
+        String key = "key";
+        String value = "some_string";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = new 
HashSet<>(Collections.singletonList(key));
+
+        // Create a Row with two fields - "key" and "otherField".  "key" is 
the primary key.
+        // For an Insert request, all fields should be included regardless of 
the Primary Key.
+        DataType dataType =
+                DataTypes.ROW(
+                        DataTypes.FIELD(key, DataTypes.STRING()),
+                        DataTypes.FIELD(otherField, DataTypes.STRING()));
+        RowDataToAttributeValueConverter rowDataToAttributeValueConverter =
+                new RowDataToAttributeValueConverter(dataType, primaryKeys);
+        RowData rowData =
+                createElementWithMultipleFields(
+                        StringData.fromString(value), 
StringData.fromString(otherValue));
+        rowData.setRowKind(RowKind.INSERT);
+
+        Map<String, AttributeValue> actualResult =
+                rowDataToAttributeValueConverter.convertRowData(rowData);
+        Map<String, AttributeValue> expectedResult = new HashMap<>();
+        expectedResult.put(key, AttributeValue.builder().s(value).build());
+        expectedResult.put(otherField, 
AttributeValue.builder().s(otherValue).build());
+
+        assertThat(actualResult).containsAllEntriesOf(expectedResult);
+        assertThat(expectedResult).containsAllEntriesOf(actualResult);
+    }
+
+    @Test
+    void testPKIgnoredForUpdateAfter() {
+        String key = "key";
+        String value = "some_string";
+        String otherField = "other_field";
+        String otherValue = "other_value";
+        Set<String> primaryKeys = new 
HashSet<>(Collections.singletonList(key));

Review Comment:
   nit: `Collections.singleton(key)`



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