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new 91208b464d [cdc] Return an empty string for canal/aliyun enum index 0
(#10371)
91208b464d is described below
commit 91208b464d26eaca5e4f3c44ec40ee71cb4e6601
Author: jackylee <[email protected]>
AuthorDate: Mon Oct 5 20:44:51 2026 +0800
[cdc] Return an empty string for canal/aliyun enum index 0 (#10371)
---
.../cdc/format/aliyun/AliyunFieldParser.java | 5 +++
.../action/cdc/format/canal/CanalFieldParser.java | 5 +++
.../cdc/format/aliyun/AliyunFieldParserTest.java | 37 ++++++++++++++++++++++
.../cdc/format/canal/CanalFieldParserTest.java | 37 ++++++++++++++++++++++
4 files changed, 84 insertions(+)
diff --git
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/aliyun/AliyunFieldParser.java
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/aliyun/AliyunFieldParser.java
index 824ed91459..13e371483d 100644
---
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/aliyun/AliyunFieldParser.java
+++
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/aliyun/AliyunFieldParser.java
@@ -70,6 +70,11 @@ public class AliyunFieldParser {
protected static String getEnumValueByIndex(String mysqlType, int
elementIndex) {
String[] options = extractEnumValueByIndex(mysqlType);
+ // MySQL uses enum index 0 for an empty or invalid value; map it to
the empty
+ // string instead of indexing options[-1].
+ if (elementIndex <= 0) {
+ return "";
+ }
return options[elementIndex - 1];
}
diff --git
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/canal/CanalFieldParser.java
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/canal/CanalFieldParser.java
index 6dcca098e8..5f2fbe4c07 100644
---
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/canal/CanalFieldParser.java
+++
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/format/canal/CanalFieldParser.java
@@ -70,6 +70,11 @@ public class CanalFieldParser {
protected static String getEnumValueByIndex(String mysqlType, int
elementIndex) {
String[] options = extractEnumValueByIndex(mysqlType);
+ // MySQL uses enum index 0 for an empty or invalid value; map it to
the empty
+ // string instead of indexing options[-1].
+ if (elementIndex <= 0) {
+ return "";
+ }
return options[elementIndex - 1];
}
diff --git
a/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/format/aliyun/AliyunFieldParserTest.java
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/format/aliyun/AliyunFieldParserTest.java
new file mode 100644
index 0000000000..51cdf19388
--- /dev/null
+++
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/format/aliyun/AliyunFieldParserTest.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.paimon.flink.action.cdc.format.aliyun;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/** Unit tests for {@link AliyunFieldParser}. */
+public class AliyunFieldParserTest {
+
+ @Test
+ public void testEnumIndexZeroMapsToEmptyString() {
+ // MySQL stores enum index 0 for an empty or invalid value, so it must
map to the empty
+ // string rather than indexing options[-1] and throwing
ArrayIndexOutOfBoundsException.
+ assertThat(AliyunFieldParser.getEnumValueByIndex("enum('a','b','c')",
0)).isEmpty();
+ // Valid 1-based indices still resolve to their members.
+ assertThat(AliyunFieldParser.getEnumValueByIndex("enum('a','b','c')",
1)).isEqualTo("a");
+ assertThat(AliyunFieldParser.getEnumValueByIndex("enum('a','b','c')",
3)).isEqualTo("c");
+ }
+}
diff --git
a/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/format/canal/CanalFieldParserTest.java
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/format/canal/CanalFieldParserTest.java
new file mode 100644
index 0000000000..0f6b650064
--- /dev/null
+++
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/format/canal/CanalFieldParserTest.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.paimon.flink.action.cdc.format.canal;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/** Unit tests for {@link CanalFieldParser}. */
+public class CanalFieldParserTest {
+
+ @Test
+ public void testEnumIndexZeroMapsToEmptyString() {
+ // MySQL stores enum index 0 for an empty or invalid value, so it must
map to the empty
+ // string rather than indexing options[-1] and throwing
ArrayIndexOutOfBoundsException.
+ assertThat(CanalFieldParser.getEnumValueByIndex("enum('a','b','c')",
0)).isEmpty();
+ // Valid 1-based indices still resolve to their members.
+ assertThat(CanalFieldParser.getEnumValueByIndex("enum('a','b','c')",
1)).isEqualTo("a");
+ assertThat(CanalFieldParser.getEnumValueByIndex("enum('a','b','c')",
3)).isEqualTo("c");
+ }
+}
