[INLONG-11302][SDK] Transform SQL supports "JSON_INSERT" function

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

@@ -0,0 +1,264 @@
+/*
+ * 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.json;
+
+import org.apache.inlong.sdk.transform.decode.SourceData;
+import org.apache.inlong.sdk.transform.process.Context;
+import org.apache.inlong.sdk.transform.process.function.TransformFunction;
+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 net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.Function;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * JsonInsertFunction   ->  JSON_INSERT(json_doc, path, val[, path, val, ...])
+ * description:
+ * - return NULL if any argument is NULL or the 'json_doc' argument is not a valid JSON document
+ *          or any path argument is not a valid path expression or contains a * or ** wildcard;
+ * - return the result of inserting data into 'json_doc'.
+ */
+@TransformFunction(names = {
+        "json_insert"}, parameter = "(String json_doc, String path1, String val1[, String path2, String val2, ...] )", descriptions = {
+                "- Return \"\" if any argument is NULL or the 'json_doc' argument is not a valid JSON document " +
+                        "or any path argument is not a valid path expression or contains a * or ** wildcard.;",
+                "- Return the result of inserting data into 'json_doc'."
+        }, examples = {
+                "json_insert({\"a\": {\"b\": [1, 2]}, \"c\": [3, 4]}, $.c[1][1], \"2\", \"$.c[1][1][5]\", \"1\") = " +
+                        "{\"a\":{\"b\":[1,2]},\"c\":[3,[4,[\"2\",\"1\"]]]}"
+        })
+public class JsonInsertFunction implements ValueParser {
+
+    private final ValueParser jsonDocParser;
+    private final List<ValueParser> pathValuePairsParser;
+
+    public JsonInsertFunction(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 jsonInsert(jsonDocObj.toString(), pathValuePairs);
+    }
+
+    private static String jsonInsert(String json, ArrayList<Object> pathValuePairs) {
+        if (json == null || pathValuePairs == null || pathValuePairs.size() % 2 != 0) {
+            return null;
+        }
+
+        JSONObject jsonObject;
+        try {
+            jsonObject = JSON.parseObject(json);
+        } catch (Exception e) {
+            // Invalid JSON document
+            return null;
+        }
+
+        for (int i = 0; i < pathValuePairs.size(); i += 2) {
+            String path = (String) pathValuePairs.get(i);
+            Object value = pathValuePairs.get(i + 1);
+
+            if (path == null || value == null) {
+                return null;
+            }
+
+            if (path.contains("*") || path.contains("**")) {
+                throw new IllegalArgumentException("Invalid path expression: " + path);
+            }
+
+            List<Object> tokens = parsePath(path);
+            if (tokens.isEmpty()) {
+                continue;
+            }
+
+            Object current = jsonObject;
+            Object parent = null, currentToken = null;
+
+            for (int j = 0; j < tokens.size() - 1; j++) {
+                Object token = tokens.get(j);
+                parent = current;
+                currentToken = token;
+
+                if (token instanceof String) {
+                    String key = (String) token;
+                    if (!(current instanceof JSONObject)) {
+                        JSONObject newObj = new JSONObject();
+                        if (parent instanceof JSONObject) {
+                            ((JSONObject) parent).put((String) currentToken, newObj);
+                        } else if (parent instanceof JSONArray) {
+                            ((JSONArray) parent).set((Integer) currentToken, newObj);
+                        }
+                        current = newObj;
+                    }
+                    JSONObject jsonObj = (JSONObject) current;
+
+                    Object next = jsonObj.get(key);
+                    if (next == null) {
+                        Object nextToken = tokens.get(j + 1);
+                        next = nextToken instanceof Integer ? new JSONArray() : new JSONObject();
+                        jsonObj.put(key, next);
+                    }
+                    current = next;
+                } else if (token instanceof Integer) {
+                    int index = (Integer) token;
+                    if (!(current instanceof JSONArray)) {
+                        JSONArray newArr = new JSONArray();
+                        newArr.add(current);
+                        if (parent instanceof JSONObject) {
+                            ((JSONObject) parent).put((String) currentToken, newArr);
+                        } else if (parent instanceof JSONArray) {
+                            ((JSONArray) parent).set((Integer) currentToken, newArr);
+                        }
+                        current = newArr;
+                    }
+                    JSONArray jsonArr = (JSONArray) current;
+                    if (jsonArr.size() <= index) {
+                        index = jsonArr.size();
+                    }
+                    Object next = jsonArr.get(index);
+                    if (next == null) {
+                        Object nextToken = tokens.get(j + 1);
+                        next = nextToken instanceof Integer ? new JSONArray() : new JSONObject();
+                        jsonArr.set(index, next);
+                    }
+                    current = next;
+                }
+            }
+
+            Object lastToken = tokens.get(tokens.size() - 1);
+            if (lastToken instanceof String) {
+                String key = (String) lastToken;
+                if (!(current instanceof JSONObject)) {
+                    JSONObject newObj = new JSONObject();
+                    if (parent instanceof JSONObject) {
+                        ((JSONObject) parent).put((String) currentToken, newObj);
+                    } else if (parent instanceof JSONArray) {
+                        ((JSONArray) parent).set((Integer) currentToken, newObj);
+                    }
+                    current = newObj;
+                }
+                JSONObject jsonObj = (JSONObject) current;
+                if (!jsonObj.containsKey(key)) {
+                    jsonObj.put(key, parseValue(value));
+                }
+            } else if (lastToken instanceof Integer) {
+                int index = (Integer) lastToken;
+                if (!(current instanceof JSONArray)) {
+                    JSONArray newArr = new JSONArray();
+                    newArr.add(current);
+                    if (parent instanceof JSONObject) {
+                        ((JSONObject) parent).put((String) currentToken, newArr);
+                    } else if (parent instanceof JSONArray) {
+                        ((JSONArray) parent).set((Integer) currentToken, newArr);
+                    }
+                    current = newArr;
+                }
+                JSONArray jsonArr = (JSONArray) current;
+                if (index >= jsonArr.size() || jsonArr.get(index) == null) {
+                    if (jsonArr.size() <= index) {
+                        index = jsonArr.size();
+                    }
+                    jsonArr.set(index, parseValue(value));
+                }
+            }
+        }
+
+        return jsonObject.toJSONString();
+    }
+
+    private static Object parseValue(Object value) {
+        if (value instanceof String) {
+            String str = (String) value;
+            try {
+                // Try to parse as JSON
+                Object json = JSON.parse(str);
+                if (json instanceof JSONObject || json instanceof JSONArray) {
+                    return json;
+                }
+            } catch (Exception ignored) {
+                // Not a JSON string
+            }
+        }
+        return value;
+    }
+
+    private static List<Object> parsePath(String path) {
+        if (path == null || !path.startsWith("$")) {
+            throw new IllegalArgumentException("Invalid path expression: " + path);
+        }
+
+        List<Object> tokens = new ArrayList<>();
+        int i = 1; // Skip the '$'
+        int len = path.length();
+
+        while (i < len) {
+            char c = path.charAt(i);
+            if (c == '.') {
+                i++;
+                int start = i;
+                while (i < len && path.charAt(i) != '.' && path.charAt(i) != '[') {
+                    i++;
+                }
+                if (start == i) {
+                    throw new IllegalArgumentException("Invalid path expression: " + path);
+                }
+                String key = path.substring(start, i);
+                tokens.add(key);
+            } else if (c == '[') {
+                i++;
+                int start = i;
+                while (i < len && path.charAt(i) != ']') {
+                    i++;
+                }
+                if (i == len || path.charAt(i) != ']') {
+                    throw new IllegalArgumentException("Invalid path expression: " + path);
+                }
+                String indexStr = path.substring(start, i);
+                i++; // Skip ']'
+                try {
+                    int index = Integer.parseInt(indexStr);
+                    tokens.add(index);
+                } catch (NumberFormatException e) {
+                    throw new IllegalArgumentException("Invalid array index in path: " + path);
+                }
+            } else {
+                throw new IllegalArgumentException("Invalid path expression: " + path);
+            }
+        }
+        return tokens;
+    }
+}

inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/json/TestJsonInsertFunction.java

@@ -0,0 +1,67 @@
+/*
+ * 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.json;
+
+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.apache.inlong.sdk.transform.process.function.string.AbstractFunctionStringTestBase;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.List;
+
+public class TestJsonInsertFunction extends AbstractFunctionStringTestBase {
+
+    @Test
+    public void testJsonInsertFunction() throws Exception {
+        String transformSql = null, data = null;
+        TransformConfig config = null;
+        TransformProcessor<String, String> processor = null;
+        List<String> output = null;
+
+        String json_doc = "{\\\"a\\\": {\\\"b\\\": [1, 2]}, \\\"c\\\": [3, 4]}";
+        transformSql = "select json_insert(string1,string2,string3,numeric1,numeric2) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case1: json_insert({"a": {"b": [1, 2]}, "c": [3, 4]}, $.c[1][1], 2, "$.c[1][1][5]", 1)
+        data = json_doc + "|$.c[1][1]|2|$.c[1][1][5]|1";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={\"a\":{\"b\":[1,2]},\"c\":[3,[4,[\"2\",\"1\"]]]}", output.get(0));
+
+        // case2: json_insert({"a": {"b": [1, 2]}, "c": [3, 4]}, $.c[1][1], 2, "$.c[1][1]", 1)
+        data = json_doc + "|$.c[1][1]|2|$.c[1][1]|1";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={\"a\":{\"b\":[1,2]},\"c\":[3,[4,\"2\"]]}", output.get(0));
+
+        // case3: json_insert({"a": {"b": [1, 2]}, "c": [3, 4]}, "$.c", 2, "$.d", 1)
+        data = json_doc + "|$.c|2|$.d|1";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={\"a\":{\"b\":[1,2]},\"c\":[3,4],\"d\":\"1\"}", output.get(0));
+
+    }
+}