[INLONG-11242][SDK] Transform support MAP() function (apache#11276)

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

@@ -0,0 +1,73 @@
+/*
+ * 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 net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.Function;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+/**
+ * MapFunction
+ * description: MAP(ANY1, ANY2, ANY3, ANY4, ...)--Returns a map created from a list of
+ *              key-value pairs ((value1, value2), (value3, value4), …).
+ * for example: Map('he',7,'xxd')--return null
+ *              Map('he',1,'xxd','cloud')--return {he=1, xxd=cloud}
+ *              Map('xxd','cloud',map(1,2),map(3,'apple'))--return {xxd=cloud, {1=2}={3=apple}}
+ */
+@TransformFunction(names = {"map"})
+public class MapFunction implements ValueParser {
+
+    private List<ValueParser> parserList;
+
+    public MapFunction(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) {
+        if (parserList.size() % 2 != 0) {
+            throw new IllegalArgumentException("Input values must be in key-value pairs.");
+        }
+        Map<Object, Object> res = new LinkedHashMap<>();
+
+        for (int i = 0; i < parserList.size(); i += 2) {
+            Object key = parserList.get(i).parse(sourceData, rowIndex, context);
+            Object value = parserList.get(i + 1).parse(sourceData, rowIndex, context);
+            res.put(key, value);
+        }
+        return res;
+    }
+
+}

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

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+/*
+ * 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 TestMapFunction extends AbstractFunctionStringTestBase {
+
+    @Test
+    public void testMapFunction() throws Exception {
+        String transformSql = null, data = null;
+        TransformConfig config = null;
+        TransformProcessor<String, String> processor = null;
+        List<String> output = null;
+
+        transformSql = "select map(string1,numeric1,string2) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case1: Map('he',7,'xxd')
+        data = "he|xxd|cloud|7|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        transformSql = "select map(string1,numeric1,string2,string3) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case2: Map('he',1,'xxd','cloud')
+        data = "he|xxd|cloud|1|3|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={he=1, xxd=cloud}", output.get(0));
+
+        transformSql = "select map(numeric1,numeric2,string1,string2) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case2: Map(1,2,'cloud','xxd')
+        data = "1|2|3|xxd|cloud|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={xxd=cloud, 1=2}", output.get(0));
+
+        transformSql = "select map(numeric1,numeric2,map(string1,string2),map(string3,numeric3)) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+
+        // case2: Map('xxd','cloud',map(1,2),map(3,'apple'))
+        data = "1|2|3|xxd|cloud|apple";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result={xxd=cloud, {1=2}={3=apple}}", output.get(0));
+
+    }
+}