[flink] Support updating row type nested in array/map in Flink

paimon-common/src/main/java/org/apache/paimon/casting/CastElementGetter.java

@@ -0,0 +1,41 @@
+/*
+ * 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.casting;
+
+import org.apache.paimon.data.InternalArray;
+
+/** Get element from array and cast it according to specific {@link CastExecutor}. */
+public class CastElementGetter {
+
+    private final InternalArray.ElementGetter elementGetter;
+    private final CastExecutor<Object, Object> castExecutor;
+
+    @SuppressWarnings("unchecked")
+    public CastElementGetter(
+            InternalArray.ElementGetter elementGetter, CastExecutor<?, ?> castExecutor) {
+        this.elementGetter = elementGetter;
+        this.castExecutor = (CastExecutor<Object, Object>) castExecutor;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <V> V getElementOrNull(InternalArray array, int pos) {
+        Object value = elementGetter.getElementOrNull(array, pos);
+        return value == null ? null : (V) castExecutor.cast(value);
+    }
+}

paimon-common/src/main/java/org/apache/paimon/casting/CastFieldGetter.java

@@ -24,14 +24,17 @@
  * Get field value from row with given pos and cast it according to specific {@link CastExecutor}.
  */
 public class CastFieldGetter {
+
     private final InternalRow.FieldGetter fieldGetter;
     private final CastExecutor<Object, Object> castExecutor;
 
+    @SuppressWarnings("unchecked")
     public CastFieldGetter(InternalRow.FieldGetter fieldGetter, CastExecutor<?, ?> castExecutor) {
         this.fieldGetter = fieldGetter;
         this.castExecutor = (CastExecutor<Object, Object>) castExecutor;
     }
 
+    @SuppressWarnings("unchecked")
     public <V> V getFieldOrNull(InternalRow row) {
         Object value = fieldGetter.getFieldOrNull(row);
         return value == null ? null : (V) castExecutor.cast(value);

paimon-common/src/main/java/org/apache/paimon/casting/CastedArray.java

@@ -0,0 +1,201 @@
+/*
+ * 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.casting;
+
+import org.apache.paimon.data.BinaryString;
+import org.apache.paimon.data.Decimal;
+import org.apache.paimon.data.InternalArray;
+import org.apache.paimon.data.InternalMap;
+import org.apache.paimon.data.InternalRow;
+import org.apache.paimon.data.Timestamp;
+
+/**
+ * An implementation of {@link InternalArray} which provides a casted view of the underlying {@link
+ * InternalArray}.
+ *
+ * <p>It reads data from underlying {@link InternalArray} according to source logical type and casts
+ * it with specific {@link CastExecutor}.
+ */
+public class CastedArray implements InternalArray {
+
+    private final CastElementGetter castElementGetter;
+    private InternalArray array;
+
+    protected CastedArray(CastElementGetter castElementGetter) {
+        this.castElementGetter = castElementGetter;
+    }
+
+    /**
+     * Replaces the underlying {@link InternalArray} backing this {@link CastedArray}.
+     *
+     * <p>This method replaces the array in place and does not return a new object. This is done for
+     * performance reasons.
+     */
+    public static CastedArray from(CastElementGetter castElementGetter) {
+        return new CastedArray(castElementGetter);
+    }
+
+    public CastedArray replaceArray(InternalArray array) {
+        this.array = array;
+        return this;
+    }
+
+    @Override
+    public int size() {
+        return array.size();
+    }
+
+    @Override
+    public boolean[] toBooleanArray() {
+        boolean[] result = new boolean[size()];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = castElementGetter.getElementOrNull(array, i);
+        }
+        return result;
+    }
+
+    @Override
+    public byte[] toByteArray() {
+        byte[] result = new byte[size()];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = castElementGetter.getElementOrNull(array, i);
+        }
+        return result;
+    }
+
+    @Override
+    public short[] toShortArray() {
+        short[] result = new short[size()];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = castElementGetter.getElementOrNull(array, i);
+        }
+        return result;
+    }
+
+    @Override
+    public int[] toIntArray() {
+        int[] result = new int[size()];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = castElementGetter.getElementOrNull(array, i);
+        }
+        return result;
+    }
+
+    @Override
+    public long[] toLongArray() {
+        long[] result = new long[size()];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = castElementGetter.getElementOrNull(array, i);
+        }
+        return result;
+    }
+
+    @Override
+    public float[] toFloatArray() {
+        float[] result = new float[size()];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = castElementGetter.getElementOrNull(array, i);
+        }
+        return result;
+    }
+
+    @Override
+    public double[] toDoubleArray() {
+        double[] result = new double[size()];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = castElementGetter.getElementOrNull(array, i);
+        }
+        return result;
+    }
+
+    @Override
+    public boolean isNullAt(int pos) {
+        return castElementGetter.getElementOrNull(array, pos) == null;
+    }
+
+    @Override
+    public boolean getBoolean(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public byte getByte(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public short getShort(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public int getInt(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public long getLong(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public float getFloat(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public double getDouble(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public BinaryString getString(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public Decimal getDecimal(int pos, int precision, int scale) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public Timestamp getTimestamp(int pos, int precision) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public byte[] getBinary(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public InternalArray getArray(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public InternalMap getMap(int pos) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+
+    @Override
+    public InternalRow getRow(int pos, int numFields) {
+        return castElementGetter.getElementOrNull(array, pos);
+    }
+}

paimon-common/src/main/java/org/apache/paimon/casting/CastedMap.java

@@ -0,0 +1,70 @@
+/*
+ * 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.casting;
+
+import org.apache.paimon.data.InternalArray;
+import org.apache.paimon.data.InternalMap;
+
+/**
+ * An implementation of {@link InternalMap} which provides a casted view of the underlying {@link
+ * InternalMap}.
+ *
+ * <p>It reads data from underlying {@link InternalMap} according to source logical type and casts
+ * it with specific {@link CastExecutor}.
+ */
+public class CastedMap implements InternalMap {
+
+    private final CastedArray castedValueArray;
+    private InternalMap map;
+
+    protected CastedMap(CastElementGetter castValueGetter) {
+        this.castedValueArray = CastedArray.from(castValueGetter);
+    }
+
+    /**
+     * Replaces the underlying {@link InternalMap} backing this {@link CastedMap}.
+     *
+     * <p>This method replaces the map in place and does not return a new object. This is done for
+     * performance reasons.
+     */
+    public static CastedMap from(CastElementGetter castValueGetter) {
+        return new CastedMap(castValueGetter);
+    }
+
+    public CastedMap replaceMap(InternalMap map) {
+        this.castedValueArray.replaceArray(map.valueArray());
+        this.map = map;
+        return this;
+    }
+
+    @Override
+    public int size() {
+        return map.size();
+    }
+
+    @Override
+    public InternalArray keyArray() {
+        return map.keyArray();
+    }
+
+    @Override
+    public InternalArray valueArray() {
+        return castedValueArray;
+    }
+}

paimon-common/src/main/java/org/apache/paimon/casting/CastedRow.java

@@ -34,8 +34,6 @@
  *
  * <p>It reads data from underlying {@link InternalRow} according to source logical type and casts
  * it with specific {@link CastExecutor}.
- *
- * <p>Note: This class supports only top-level castings, not nested castings.
  */
 public class CastedRow implements InternalRow {