[INLONG-10881][SDK] Transform SQL support concat_ws function (apache#…

…10992)

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

@@ -0,0 +1,94 @@
+/*
+ * 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 net.sf.jsqlparser.expression.NullValue;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * ConcatWsFunction
+ * description: concat_ws(string1, string2, string3,…)--Returns a string that concatenates STRING2,
+ * STRING3, … with a separator STRING1. The separator is added between the strings to be concatenated.
+ * Returns NULL If STRING1 is NULL.
+ */
+@TransformFunction(names = {"concat_ws"})
+public class ConcatWsFunction implements ValueParser {
+
+    private final String separator;
+    private final List<ValueParser> nodeList;
+
+    public ConcatWsFunction(Function expr) {
+        List<Expression> params = expr.getParameters().getExpressions();
+        if (params == null || params.isEmpty()) {
+            this.separator = null;
+            this.nodeList = new ArrayList<>();
+            return;
+        }
+
+        // Handle the case where the separator is NULL
+        Expression separatorExpr = params.get(0);
+        if (separatorExpr instanceof NullValue) {
+            this.separator = null;
+        } else {
+            this.separator = OperatorTools.parseString(
+                    OperatorTools.buildParser(separatorExpr).parse(null, 0, null));
+        }
+
+        this.nodeList = new ArrayList<>(params.size() - 1);
+        for (int i = 1; i < params.size(); i++) {
+            Expression paramExpr = params.get(i);
+            if (paramExpr instanceof NullValue) {
+                // Add null to the list to be handled in parse method
+                nodeList.add(null);
+            } else {
+                nodeList.add(OperatorTools.buildParser(paramExpr));
+            }
+        }
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        if (separator == null) {
+            return null;
+        }
+        StringBuilder result = new StringBuilder();
+        boolean firstStrFlag = true;
+        for (ValueParser node : nodeList) {
+            if (node != null) {
+                Object parsedValue = node.parse(sourceData, rowIndex, context);
+                if (parsedValue != null) {
+                    if (!firstStrFlag) {
+                        result.append(separator);
+                    }
+                    result.append(parsedValue);
+                    firstStrFlag = false;
+                }
+            }
+        }
+        return result.toString();
+    }
+}

inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/TestTransformConcatWsFunctionProcessor.java

@@ -0,0 +1,111 @@
+/*
+ * 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;
+
+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.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+/**
+ * TestTransformConcatWsFunctionProcessor
+ * description: test the concat_ws function in transform processor
+ */
+public class TestTransformConcatWsFunctionProcessor {
+
+    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 field = new FieldInfo();
+            field.setName("string" + i);
+            srcFields.add(field);
+        }
+        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 testConcatWsFunction() throws Exception {
+        // case 1: concat_ws('-', 'apple', 'banana', 'cloud')
+        String transformSql1 = "select concat_ws('-', string1, string2, string3) from source";
+        TransformConfig config1 = new TransformConfig(transformSql1);
+        TransformProcessor<String, String> processor1 = TransformProcessor
+                .create(config1, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        List<String> output1 = processor1.transform("apple|banana|cloud|extra", new HashMap<>());
+        Assert.assertEquals(1, output1.size());
+        Assert.assertEquals(output1.get(0), "result=apple-banana-cloud");
+
+        // case 2: concat_ws('-', 'apple', '', 'cloud')
+        String transformSql2 = "select concat_ws('-', string1, string2, string3) from source";
+        TransformConfig config2 = new TransformConfig(transformSql2);
+        TransformProcessor<String, String> processor2 = TransformProcessor
+                .create(config2, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        List<String> output2 = processor2.transform("apple||cloud|extra", new HashMap<>());
+        Assert.assertEquals(1, output2.size());
+        Assert.assertEquals(output2.get(0), "result=apple--cloud");
+
+        // case 3: concat_ws('-', 'apple', null, 'cloud')
+        String transformSql3 = "select concat_ws('-', string1, stringX, string3) from source";
+        TransformConfig config3 = new TransformConfig(transformSql3);
+        TransformProcessor<String, String> processor3 = TransformProcessor
+                .create(config3, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        List<String> output3 = processor3.transform("apple|banana|cloud|extra", new HashMap<>());
+        Assert.assertEquals(1, output3.size());
+        Assert.assertEquals(output3.get(0), "result=apple-cloud");
+
+        // case 4: concat_ws(null, 'apple', 'banana', 'cloud')
+        String transformSql4 = "select concat_ws(null, string1, string2, string3) from source";
+        TransformConfig config4 = new TransformConfig(transformSql4);
+        TransformProcessor<String, String> processor4 = TransformProcessor
+                .create(config4, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        List<String> output4 = processor4.transform("apple|null|cloud|extra", new HashMap<>());
+        Assert.assertEquals(1, output4.size());
+        Assert.assertEquals(output4.get(0), "result=null");
+
+        // case 5: concat_ws('-', '', '', '')
+        String transformSql5 = "select concat_ws('-', string1, string2, string3) from source";
+        TransformConfig config5 = new TransformConfig(transformSql5);
+        TransformProcessor<String, String> processor5 = TransformProcessor
+                .create(config5, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        List<String> output5 = processor5.transform("|||", new HashMap<>());
+        Assert.assertEquals(1, output5.size());
+        Assert.assertEquals(output5.get(0), "result=--");
+    }
+
+}