[INLONG-11225][SDK] Transform support JSON_ARRAY() function (#11273)

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

@@ -0,0 +1,81 @@
+/*
+ * 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 net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.Function;
+
+import java.util.ArrayList;
+import java.util.List;
+/**
+ * JsonArraysFunction
+ * description: JSON_ARRAYS()--Builds a JSON array string from a list of values. This function returns a JSON string.
+ *              The values can be arbitrary expressions.
+ * for example: JSON_ARRAYS()--'[]'
+ *              JSON_ARRAYS(1, '2')--'[1,"2"]'
+ *              JSON_ARRAYS(JSON_ARRAY(1))--'[[1]]'
+ */
+@TransformFunction(names = {"json_arrays"})
+public class JsonArraysFunction implements ValueParser {
+
+    private List<ValueParser> parserList;
+
+    public JsonArraysFunction(Function expr) {
+        if (expr.getParameters() == null) {
+            this.parserList = new ArrayList<>();
+        } else {
+            List<Expression> params = expr.getParameters().getExpressions();
+            parserList = new ArrayList<>(params.size());
+            for (Expression param : params) {
+                ValueParser node = OperatorTools.buildParser(param);
+                parserList.add(node);
+            }
+        }
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        JSONArray jsonArray = new JSONArray();
+        for (ValueParser valueParser : parserList) {
+
+            Object parseObj = valueParser.parse(sourceData, rowIndex, context);
+            if (parseObj instanceof String && isJsonArray((String) parseObj)) {
+                jsonArray.add(JSON.parseArray((String) parseObj));
+            } else {
+                jsonArray.add(parseObj);
+            }
+        }
+        return jsonArray.toJSONString();
+    }
+
+    private boolean isJsonArray(String jsonStr) {
+        try {
+            JSON.parseArray(jsonStr);
+            return true;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+}

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

@@ -0,0 +1,116 @@
+/*
+ * 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.CsvSourceInfo;
+import org.apache.inlong.sdk.transform.pojo.FieldInfo;
+import org.apache.inlong.sdk.transform.pojo.KvSinkInfo;
+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.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class TestJsonArraysFunction extends AbstractFunctionStringTestBase {
+
+    private static final List<FieldInfo> srcFields = new ArrayList<>();
+    private static final List<FieldInfo> dstFields = new ArrayList<>();
+    private static final CsvSourceInfo csvSource;
+    private static final KvSinkInfo kvSink;
+
+    static {
+        for (int i = 1; i < 4; i++) {
+            FieldInfo field1 = new FieldInfo();
+            field1.setName("string" + i);
+            srcFields.add(field1);
+            FieldInfo field2 = new FieldInfo();
+            field2.setName("numeric" + i);
+            srcFields.add(field2);
+        }
+        FieldInfo field = new FieldInfo();
+        field.setName("result");
+        dstFields.add(field);
+        csvSource = new CsvSourceInfo("UTF-8", '|', '\\', srcFields);
+        kvSink = new KvSinkInfo("UTF-8", dstFields);
+    }
+
+    @Test
+    public void testJsonArraysFunction() throws Exception {
+        String transformSql = "select json_arrays(string1,numeric1,string2) from source";
+        TransformConfig config = new TransformConfig(transformSql);
+        TransformProcessor<String, String> processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case1: json_array('apple', '1', 'good')
+        List<String> output1 = processor.transform("apple|1|good|cloud|1", new HashMap<>());
+        Assert.assertEquals(1, output1.size());
+        Assert.assertEquals(output1.get(0), "result=[\"apple\",\"1\",\"good\"]");
+
+        String transformSql2 = "select json_arrays(numeric1,numeric2,numeric3) from source";
+        TransformConfig config2 = new TransformConfig(transformSql2);
+        TransformProcessor<String, String> processor2 = TransformProcessor
+                .create(config2, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case2: json_array('1', '2', '3')
+        List<String> output2 = processor2.transform("aa|1|bb|2|cc|3", new HashMap<>());
+        Assert.assertEquals(1, output2.size());
+        Assert.assertEquals(output2.get(0), "result=[\"1\",\"2\",\"3\"]");
+
+        String transformSql3 = "select json_arrays(truncate(numeric1, numeric2),numeric3) from source";
+        TransformConfig config3 = new TransformConfig(transformSql3);
+        TransformProcessor<String, String> processor3 = TransformProcessor
+                .create(config3, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case3: json_arrays(truncate(43.324, -1), '6')
+        List<String> output3 = processor3.transform("aa|42.324|bb|-1|cc|6|", new HashMap<>());
+        Assert.assertEquals(1, output3.size());
+        Assert.assertEquals(output3.get(0), "result=[40,\"6\"]");
+
+        String transformSql4 = "select json_arrays(json_arrays(truncate(numeric1, numeric2),numeric3)) from source";
+        TransformConfig config4 = new TransformConfig(transformSql4);
+        TransformProcessor<String, String> processor4 = TransformProcessor
+                .create(config4, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case3: json_arrays(json_arrays(truncate(42.324, -1), '6'))
+        List<String> output4 = processor4.transform("aa|42.324|bb|-1|cc|6|", new HashMap<>());
+        Assert.assertEquals(1, output4.size());
+        Assert.assertEquals(output4.get(0), "result=[[40,\"6\"]]");
+
+        String transformSql5 = "select json_arrays() from source";
+        TransformConfig config5 = new TransformConfig(transformSql5);
+        TransformProcessor<String, String> processor5 = TransformProcessor
+                .create(config5, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case3: json_arrays()
+        List<String> output5 = processor5.transform("aa|42.324|bb|-1|cc|6|", new HashMap<>());
+        Assert.assertEquals(1, output5.size());
+        Assert.assertEquals(output5.get(0), "result=[]");
+
+    }
+}