[INLONG-11223][SDK] Transform support JSON_VALUE() function

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

@@ -0,0 +1,65 @@
+/*
+ * 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.JSONPath;
+import net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.Function;
+
+import java.util.List;
+
+/**
+ * JsonValueFunction
+ * description: JSON_VALUE(jsonValue, path)--Extracts a scalar from a JSON string.
+ * for example:
+ */
+@TransformFunction(names = {"json_value"})
+public class JsonValueFunction implements ValueParser {
+
+    private final ValueParser jsonParser;
+
+    private final ValueParser pathParser;
+
+    public JsonValueFunction(Function expr) {
+        List<Expression> expressions = expr.getParameters().getExpressions();
+        this.jsonParser = OperatorTools.buildParser(expressions.get(0));
+        this.pathParser = OperatorTools.buildParser(expressions.get(1));
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        Object jsonObj = jsonParser.parse(sourceData, rowIndex, context);
+        Object pathObj = pathParser.parse(sourceData, rowIndex, context);
+        if (jsonObj == null || pathObj == null) {
+            return null;
+        }
+        String path = OperatorTools.parseString(pathObj);
+        String json = OperatorTools.parseString(jsonObj);
+
+        if (path.isEmpty()) {
+            return null;
+        }
+        Object res = JSONPath.read(json, path);
+        return res != null ? res.toString() : null;
+    }
+}

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

@@ -0,0 +1,147 @@
+/*
+ * 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 TestJsonValueFunction extends AbstractFunctionStringTestBase {
+
+    @Test
+    public void testJsonExistsFunction() throws Exception {
+        String transformSql = null, data = null;
+        TransformConfig config = null;
+        TransformProcessor<String, String> processor = null;
+        List<String> output = null;
+        transformSql = "select json_value(string1,string2) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case1: json_value({"a": 1}, $.a)
+        data = "{\"a\": 1}|$.a|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=1", output.get(0));
+
+        // case2: json_value({"a": null}, $.a)
+        data = "{\"a\": null}|$.a|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case3: json_value({"a": true}, $.b)
+        data = "{\"a\": true}|$.b|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case4: json_value(null, $.a)
+        data = "|$.a|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case5: json_value({"a": true}, null)
+        data = "{\"a\": true}||3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case6: json_value({\"person\": {\"name\": \"Alice\" ,\"age\": 30}}, $.person.name)
+        data = "{\\\"person\\\": {\\\"name\\\": \\\"Alice\\\" ,\\\"age\\\": 30}}|$.person.name|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=Alice", output.get(0));
+
+        // case7: json_value({\"person\": {\"name\": \"Alice\", \"age\": 30}}, $.person.address)
+        data = "{\\\"person\\\": {\\\"name\\\": \\\"Alice\\\", \\\"age\\\": 30}}|$.person.address|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case8: json_value({\"person\" : {\"name\" : \"Amy\" }}, $.person.name)
+        data = "{\\\"person\\\" : {\\\"name\\\" : \\\"Amy\\\" }}|$.person.name|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=Amy", output.get(0));
+
+        // case9: json_value({\"people\": [{\"name\": \"Alice\"}, {\"name\": \"Bob\"}]}, $.people[0].name)
+        data = "{\\\"people\\\": [{\\\"name\\\": \\\"Alice\\\"}, {\\\"name\\\": \\\"Bob\\\"}]}|$.people[0].name|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=Alice", output.get(0));
+
+        // case10: json_value({\"people\": [{\"name\": \"Alice\"}, {\"name\": \"Bob\"}]}, $.people[2].name)
+        data = "{\\\"people\\\": [{\\\"name\\\": \\\"Alice\\\"}, {\\\"name\\\": \\\"Bob\\\"}]}|$.people[2].name|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case11: json_value({\"data\": [{\"details\": {\"status\": \"active\"}},
+        // {\"details\": {\"status\": \"inactive\"}}]}, $.data[1].details.status)
+        data = "{\\\"data\\\": [{\\\"details\\\": {\\\"status\\\": \\\"active\\\"}}, " +
+                "{\\\"details\\\": {\\\"status\\\": \\\"inactive\\\"}}]}|$.data[1].details.status|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=inactive", output.get(0));
+
+        // case12: json_value({\"records\": [{\"id\": 1, \"info\": {\"valid\": true}},
+        // {\"id\": 2, \"info\": {\"valid\": false}}]}, $.records[0].info.valid)
+        data = "{\\\"records\\\": [{\\\"id\\\": 1, \\\"info\\\": {\\\"valid\\\": true}}, " +
+                "{\\\"id\\\": 2, \\\"info\\\": {\\\"valid\\\": false}}]}|$.records[0].info.valid|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=true", output.get(0));
+
+        // case13: json_value({"data": {"items": [{"id": 1, "details": {"price": 100}},
+        // {"id": 2, "details": {"price": 200}}]}}, $.data.items[1].details.discount)
+        data = "{\"data\": {\"items\": [{\"id\": 1, \"details\": {\"price\": 100}}, " +
+                "{\"id\": 2, \"details\": {\"price\": 200}}]}}|$.data.items[1].details.discount|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case14: json_value({"items": []}, $.items[0])
+        data = "{\"items\": []}|$.items[0]|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case15: json_value({\"list\": [null, {\"name\": \"John\"}]}, $.list[0])
+        data = "{\\\"list\\\": [null, {\\\"name\\\": \\\"John\\\"}]}|$.list[0]|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        // case16: json_value({\"list\": [null, {\"name\": \"John\"}]}, $.list[1].name)
+        data = "{\\\"list\\\": [null, {\\\"name\\\": \\\"John\\\"}]}|$.list[1].name|3|5";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=John", output.get(0));
+    }
+}