[INLONG-11237][SDK] Transform SQL supports CHAR_LENGTH function

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

@@ -0,0 +1,55 @@
+/*
+ * 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.List;
+
+/**
+ * LengthFunction
+ * description: char_length(string)
+ * - return the character length of the string
+ * - return NULL if the string is NULL
+ */
+@TransformFunction(names = {"char_length"})
+public class CharLengthFunction implements ValueParser {
+
+    private final ValueParser stringParser;
+
+    public CharLengthFunction(Function expr) {
+        List<Expression> expressions = expr.getParameters().getExpressions();
+        stringParser = OperatorTools.buildParser(expressions.get(0));
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        Object stringObject = stringParser.parse(sourceData, rowIndex, context);
+        if (stringObject == null) {
+            return null;
+        }
+        String str = OperatorTools.parseString(stringObject);
+        return str.length();
+    }
+}

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

@@ -22,21 +22,31 @@
 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.nio.charset.Charset;
+import java.util.List;
+
 /**
  * LengthFunction
- * description: length(string)
- * - return the length of the string
+ * description: length(string,[charsetName])
+ * - return the byte length of the string
  * - return NULL if the string is NULL
  */
 @TransformFunction(names = {"length"})
 public class LengthFunction implements ValueParser {
 
     private final ValueParser stringParser;
+    private ValueParser charSetNameParser;
+    private final Charset DEFAULT_CHARSET = Charset.defaultCharset();
 
     public LengthFunction(Function expr) {
-        stringParser = OperatorTools.buildParser(expr.getParameters().getExpressions().get(0));
+        List<Expression> expressions = expr.getParameters().getExpressions();
+        stringParser = OperatorTools.buildParser(expressions.get(0));
+        if (expressions.size() > 1) {
+            charSetNameParser = OperatorTools.buildParser(expressions.get(1));
+        }
     }
 
     @Override
@@ -45,6 +55,12 @@ public Object parse(SourceData sourceData, int rowIndex, Context context) {
         if (stringObject == null) {
             return null;
         }
-        return OperatorTools.parseString(stringObject).length();
+        Charset charset = DEFAULT_CHARSET;
+        if (charSetNameParser != null) {
+            charset = Charset.forName(OperatorTools.parseString(
+                    charSetNameParser.parse(sourceData, rowIndex, context)));
+        }
+        String str = OperatorTools.parseString(stringObject);
+        return str.getBytes(charset).length;
     }
 }

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

@@ -0,0 +1,68 @@
+/*
+ * 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 TestCharLengthFunction extends AbstractFunctionStringTestBase {
+
+    @Test
+    public void testCharLengthFunction() throws Exception {
+        String transformSql = null, data = null;
+        TransformConfig config = null;
+        TransformProcessor<String, String> processor = null;
+        List<String> output = null;
+
+        transformSql = "select char_length(string1) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        // case1: char_length('hello world')
+        data = "hello world|";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=11", output.get(0));
+
+        // case2: char_length('应龙')
+        data = "应龙|";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=2", output.get(0));
+
+        transformSql = "select char_length(xxd) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        // case3: char_length(null)
+        data = "hello world|apple|cloud|2|1|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+    }
+}

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

@@ -32,24 +32,48 @@ public class TestLengthFunction extends AbstractFunctionStringTestBase {
 
     @Test
     public void testLengthFunction() throws Exception {
-        String transformSql = "select length(string1) from source";
-        TransformConfig config = new TransformConfig(transformSql);
-        TransformProcessor<String, String> processor1 = TransformProcessor
+        String transformSql = null, data = null;
+        TransformConfig config = null;
+        TransformProcessor<String, String> processor = null;
+        List<String> output = null;
+
+        transformSql = "select length(string1) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
                 .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
                         SinkEncoderFactory.createKvEncoder(kvSink));
         // case1: length('hello world')
-        List<String> output1 = processor1.transform("hello world|apple|cloud|2|1|3", new HashMap<>());
-        Assert.assertEquals(1, output1.size());
-        Assert.assertEquals("result=11", output1.get(0));
+        data = "hello world|apple|cloud|2|1|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=11", output.get(0));
 
         transformSql = "select length(xxd) from source";
         config = new TransformConfig(transformSql);
-        processor1 = TransformProcessor
+        processor = TransformProcessor
                 .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
                         SinkEncoderFactory.createKvEncoder(kvSink));
         // case2: length(null)
-        output1 = processor1.transform("hello world|apple|cloud|2|1|3", new HashMap<>());
-        Assert.assertEquals(1, output1.size());
-        Assert.assertEquals("result=", output1.get(0));
+        data = "hello world|apple|cloud|2|1|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=", output.get(0));
+
+        transformSql = "select length(string1,string2) from source";
+        config = new TransformConfig(transformSql);
+        processor = TransformProcessor
+                .create(config, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        // case3: length(应龙, utf-8)
+        data = "应龙|utf-8|cloud|2|1|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=6", output.get(0));
+
+        // case4: length(应龙, gbk)
+        data = "应龙|gbk|cloud|2|1|3";
+        output = processor.transform(data, new HashMap<>());
+        Assert.assertEquals(1, output.size());
+        Assert.assertEquals("result=4", output.get(0));
     }
 }