[INLONG-11301][SDK] Transform SQL supports "JSON_ARRAY_INSERT" function

inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/JsonArrayInsertFunction.java

@@ -0,0 +1,124 @@
+/*
+ * 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.inlong.sdk.transform.process.function;
+
+import org.apache.inlong.sdk.transform.decode.SourceData;
+import org.apache.inlong.sdk.transform.process.Context;
+import org.apache.inlong.sdk.transform.process.operator.OperatorTools;
+import org.apache.inlong.sdk.transform.process.parser.ValueParser;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONArray;
+import com.alibaba.fastjson.JSONObject;
+import com.alibaba.fastjson.JSONPath;
+import net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.Function;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * JsonArrayInsertFunction   ->  JSON_ARRAY_INSERT(json_doc, path, val[, path, val] ...)
+ * description:
+ * - return NULL if any argument is NULL;
+ * - return the document inserted into the array.
+ * Note: If multiple groups of parameters are passed in, the parameter subscripts of the latter groups
+ * need to be based on the document subscripts after the previous group of parameters are updated.
+ */
+@TransformFunction(names = {"json_array_insert"})
+public class JsonArrayInsertFunction implements ValueParser {
+
+    private ValueParser jsonDocParser;
+    private List<ValueParser> pathValuePairsParser;
+
+    public JsonArrayInsertFunction(Function expr) {
+        List<Expression> expressions = expr.getParameters().getExpressions();
+        jsonDocParser = OperatorTools.buildParser(expressions.get(0));
+        pathValuePairsParser = new ArrayList<>();
+        for (int i = 1; i < expressions.size(); i++) {
+            pathValuePairsParser.add(OperatorTools.buildParser(expressions.get(i)));
+        }
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        Object jsonDocObj = jsonDocParser.parse(sourceData, rowIndex, context);
+        if (jsonDocObj == null) {
+            return null;
+        }
+        ArrayList<Object> pathValuePairs = new ArrayList<>();
+        for (ValueParser valueParser : pathValuePairsParser) {
+            pathValuePairs.add(valueParser.parse(sourceData, rowIndex, context));
+        }
+        return jsonArrayInsert(jsonDocObj.toString(), pathValuePairs);
+    }
+
+    private String jsonArrayInsert(String jsonDoc, ArrayList<Object> pathValuePairs) {
+        if (jsonDoc == null || pathValuePairs == null || pathValuePairs.size() % 2 != 0) {
+            return null;
+        }
+
+        Object jsonObject = JSON.parse(jsonDoc);
+
+        for (int i = 0; i < pathValuePairs.size(); i += 2) {
+            String path = (String) pathValuePairs.get(i);
+            Object value = pathValuePairs.get(i + 1);
+
+            if (!path.endsWith("]")) {
+                throw new IllegalArgumentException("Path must end with an array index: " + path);
+            }
+
+            // Find the parent path
+            String parentPath = path.substring(0, path.lastIndexOf('['));
+            Object parentNode = JSONPath.eval(jsonObject, parentPath);
+
+            if (parentNode instanceof JSONArray) {
+                // If the parent path is an array, perform the insert operation
+                insertIntoArray((JSONArray) parentNode, path, value);
+            } else if (parentNode instanceof JSONObject) {
+                // If the parent path is an object, try inserting it into the array inside the object
+                String arrayIndexPart = path.substring(path.lastIndexOf('['), path.lastIndexOf(']') + 1);
+                handleArrayInsertionInObject((JSONObject) parentNode, arrayIndexPart, value);
+            } else {
+                throw new IllegalArgumentException("Invalid path or target node is not an array or object: " + path);
+            }
+        }
+
+        return JSON.toJSONString(jsonObject);
+    }
+
+    private void insertIntoArray(JSONArray array, String path, Object value) {
+        String indexPart = path.substring(path.lastIndexOf('[') + 1, path.lastIndexOf(']'));
+        int index = Integer.parseInt(indexPart);
+
+        // If the index exceeds the length of the array, insert at the end
+        if (index >= array.size()) {
+            array.add(value);
+        } else {
+            array.add(index, value);
+        }
+    }
+
+    private void handleArrayInsertionInObject(JSONObject jsonObject, String arrayPart, Object value) {
+        String arrayField = arrayPart.substring(1, arrayPart.length() - 1);
+        JSONArray array = jsonObject.getJSONArray(arrayField);
+        if (array != null) {
+            insertIntoArray(array, arrayPart, value);
+        }
+    }
+}

inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestJsonArrayInsertFunction.java

@@ -0,0 +1,89 @@
+/*
+ * 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.inlong.sdk.transform.process.function.string;
+
+import org.apache.inlong.sdk.transform.decode.SourceDecoderFactory;
+import org.apache.inlong.sdk.transform.encode.SinkEncoderFactory;
+import org.apache.inlong.sdk.transform.pojo.TransformConfig;
+import org.apache.inlong.sdk.transform.process.TransformProcessor;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.List;
+
+public class TestJsonArrayInsertFunction extends AbstractFunctionStringTestBase {
+
+    @Test
+    public void testJsonArrayInsertFunction() throws Exception {
+        String transformSql = null, data = null;
+        TransformConfig config = null;
+        TransformProcessor<String, String> processor = null;
+        List<String> output = null;
+
+        transformSql = "select json_array_insert(string1,string2,string3) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case1: json_array_append(["a", {"b": [1, 2]}, [3, 4]], $[1], x)
+        data = "[\\\"a\\\", {\\\"b\\\": [1, 2]}, [3, 4]]|$[1]|x|";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=[\"a\",\"x\",{\"b\":[1,2]},[3,4]]", output.get(0));
+
+        // case2: json_array_append(["a", {"b": [1, 2]}, [3, 4]], $[100], x)
+        data = "[\\\"a\\\", {\\\"b\\\": [1, 2]}, [3, 4]]|$[100]|x|";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=[\"a\",{\"b\":[1,2]},[3,4],\"x\"]", output.get(0));
+
+        // case3: json_array_append(["a", {"b": [1, 2]}, [3, 4]], $[100], x)
+        data = "[\\\"a\\\", {\\\"b\\\": [1, 2]}, [3, 4]]|$[1].b[0]|x|";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=[\"a\",{\"b\":[\"x\",1,2]},[3,4]]", output.get(0));
+
+        // case4: json_array_append(["a", {"b": [1, 2]}, [3, 4]], $[100], y)
+        data = "[\\\"a\\\", {\\\"b\\\": [1, 2]}, [3, 4]]|$[2][1]|y|";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=[\"a\",{\"b\":[1,2]},[3,\"y\",4]]", output.get(0));
+
+        transformSql = "select json_array_insert(string1,string2,string3,numeric1,numeric2) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case5: json_array_append(["a", {"b": [1, 2]}, [3, 4]], "$[0]", "x", "$[2][1]", "y")
+        data = "[\\\"a\\\", {\\\"b\\\": [1, 2]}, [3, 4]]|$[0]|x|$[2][1]|y";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=[\"x\",\"a\",{\"b\":[1,2]},[3,4]]", output.get(0));
+
+        // case6: json_array_append(["a", {"b": [1, 2]}, [3, 4]], "$[0]", "x", "$[3][1]", "y")
+        data = "[\\\"a\\\", {\\\"b\\\": [1, 2]}, [3, 4]]|$[0]|x|$[3][1]|y";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=[\"x\",\"a\",{\"b\":[1,2]},[3,\"y\",4]]", output.get(0));
+
+    }
+}