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[FLINK-38888][transform] YAML Pipeline supports item subscription of array, map and row #4241
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96 changes: 96 additions & 0 deletions
96
...dc-runtime/src/main/java/org/apache/flink/cdc/runtime/functions/impl/StructFunctions.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.cdc.runtime.functions.impl; | ||
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| import java.util.List; | ||
| import java.util.Map; | ||
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| /** Struct built-in functions. */ | ||
| public class StructFunctions { | ||
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| /** | ||
| * Accesses an element from an ARRAY or MAP by index or key. | ||
| * | ||
| * <p>For ARRAY: Uses 1-based index (SQL standard). array[1] returns the first element. | ||
| * | ||
| * <p>For MAP: Uses key to access the value. map['key'] returns the value for 'key'. | ||
| */ | ||
| public static Object itemAccess(Object collection, Object indexOrKey) { | ||
| if (collection == null || indexOrKey == null) { | ||
| return null; | ||
| } | ||
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| Object result; | ||
| if (collection instanceof List) { | ||
| result = arrayElement((List) collection, indexOrKey); | ||
| } else if (collection instanceof Map) { | ||
| result = mapValue((Map<?, ?>) collection, indexOrKey); | ||
| } else { | ||
| throw new IllegalArgumentException( | ||
| "itemAccess only supports List or Map, but got: " | ||
| + collection.getClass().getName()); | ||
| } | ||
| return result; | ||
| } | ||
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| /** | ||
| * Gets an element from an Object array by index (1-based, SQL standard). This overload handles | ||
| * arrays that have been converted from ArrayData to Object[] by DataTypeConverter. | ||
| * | ||
| * @param array the Object array to access | ||
| * @param index the 1-based index | ||
| * @return the element at the specified index, or null if index is out of bounds | ||
| */ | ||
| public static Object arrayElement(List array, Object index) { | ||
| if (array == null || index == null) { | ||
| return null; | ||
| } | ||
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| int idx; | ||
| if (index instanceof Number) { | ||
| idx = ((Number) index).intValue(); | ||
| } else { | ||
| idx = Integer.parseInt(index.toString()); | ||
| } | ||
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| // Convert 1-based index to 0-based (SQL standard uses 1-based indexing) | ||
| int zeroBasedIndex = idx - 1; | ||
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| // Check bounds | ||
| if (zeroBasedIndex < 0 || zeroBasedIndex >= array.size()) { | ||
| return null; | ||
| } | ||
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| return array.get(zeroBasedIndex); | ||
| } | ||
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| /** | ||
| * Gets a value from a Map by key. | ||
| * | ||
| * @param map the Map to access | ||
| * @param key the key to look up | ||
| * @return the value for the specified key, or null if not found | ||
| */ | ||
| public static Object mapValue(Map<?, ?> map, Object key) { | ||
|
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| if (map == null || key == null) { | ||
| return null; | ||
| } | ||
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| return map.get(key); | ||
| } | ||
| } | ||
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