[BP-1.19][FLINK-38138] Fix OOB error in ColumnarArrayData

flink-table/flink-table-common/src/main/java/org/apache/flink/table/data/columnar/ColumnarArrayData.java

@@ -135,7 +135,8 @@ public byte[] getBinary(int pos) {
         if (byteArray.len == byteArray.data.length) {
             return byteArray.data;
         } else {
-            return Arrays.copyOfRange(byteArray.data, byteArray.offset, byteArray.len);
+            return Arrays.copyOfRange(
+                    byteArray.data, byteArray.offset, byteArray.offset + byteArray.len);
         }
     }
 

flink-table/flink-table-common/src/test/java/org/apache/flink/table/data/columnar/ColumnarArrayDataTest.java

@@ -0,0 +1,68 @@
+/*
+ * 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.flink.table.data.columnar;
+
+import org.apache.flink.table.data.columnar.vector.heap.HeapBytesVector;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ColumnarArrayDataTest {
+
+    @Test
+    @DisplayName("getBinary() should work correctly for slices with position 0")
+    void testGetBinaryWhenOffsetIsZero() {
+        HeapBytesVector vector = new HeapBytesVector(2);
+        byte[] sourceData = new byte[] {10, 20, 30, 40, 50};
+
+        vector.appendBytes(0, sourceData, 0, 3);
+
+        ColumnarArrayData arrayData = new ColumnarArrayData(vector, 0, 1);
+
+        byte[] actual = arrayData.getBinary(0);
+
+        byte[] expected = new byte[] {10, 20, 30};
+        assertThat(actual).isEqualTo(expected);
+    }
+
+    @Test
+    @DisplayName("getBinary() should return correct sub-array when slice position is non-zero")
+    void testGetBinaryWhenPositionNonZero() {
+        HeapBytesVector vector = new HeapBytesVector(3);
+
+        // Append a DUMMY element first
+        byte[] dummyData = new byte[] {99, 99, 99, 99};
+        vector.appendBytes(0, dummyData, 0, 4);
+
+        // Append the REAL data
+        byte[] sourceData1 = new byte[] {30, 40, 50, 60};
+        vector.appendBytes(1, sourceData1, 0, 4);
+
+        byte[] sourceData2 = new byte[] {70, 80, 90, 100};
+        vector.appendBytes(2, sourceData2, 0, 4);
+
+        // Create a ColumnarArrayData that wraps the entire vector
+        ColumnarArrayData arrayData = new ColumnarArrayData(vector, 0, 1);
+        assertThat(arrayData.getBinary(0)).isEqualTo(dummyData);
+        assertThat(arrayData.getBinary(1)).isEqualTo(sourceData1);
+        assertThat(arrayData.getBinary(2)).isEqualTo(sourceData2);
+    }
+}