[INLONG-10920][SDK] Transform support LocalTime function (#10922)

inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/LocalTimeFunction.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.Function;
+
+import java.time.LocalTime;
+import java.time.ZoneId;
+
+/**
+ *  LocalTimeFunction
+ *  description:
+ *  localTime([string1]) returns the current time in the specified time zone.
+ *  (by default: the current time in the system time zone)
+ */
+public class LocalTimeFunction implements ValueParser {
+
+    private ValueParser stringParser;
+
+    public LocalTimeFunction(Function expr) {
+        if (expr.getParameters() != null) {
+            stringParser = OperatorTools.buildParser(expr.getParameters().getExpressions().get(0));
+        }
+    }
+
+    @Override
+    public Object parse(SourceData sourceData, int rowIndex, Context context) {
+        if (stringParser != null) {
+            String zoneString = OperatorTools.parseString(stringParser.parse(sourceData, rowIndex, context));
+            return LocalTime.now(ZoneId.of(zoneString)).withNano(0);
+        } else {
+            return LocalTime.now(ZoneId.systemDefault()).withNano(0);
+        }
+    }
+}

inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/operator/OperatorTools.java

@@ -31,6 +31,7 @@
 import org.apache.inlong.sdk.transform.process.function.FromUnixTimeFunction;
 import org.apache.inlong.sdk.transform.process.function.LengthFunction;
 import org.apache.inlong.sdk.transform.process.function.LnFunction;
+import org.apache.inlong.sdk.transform.process.function.LocalTimeFunction;
 import org.apache.inlong.sdk.transform.process.function.LocateFunction;
 import org.apache.inlong.sdk.transform.process.function.Log10Function;
 import org.apache.inlong.sdk.transform.process.function.Log2Function;
@@ -118,6 +119,8 @@ public class OperatorTools {
     static {
         functionMap.put("concat", ConcatFunction::new);
         functionMap.put("now", NowFunction::new);
+        functionMap.put("localtime", LocalTimeFunction::new);
+        functionMap.put("currenttime", LocalTimeFunction::new);
         functionMap.put("power", PowerFunction::new);
         functionMap.put("abs", AbsFunction::new);
         functionMap.put("sqrt", SqrtFunction::new);

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

@@ -28,6 +28,10 @@
 import org.junit.Before;
 import org.junit.Test;
 
+import java.time.Duration;
+import java.time.LocalTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -362,4 +366,47 @@ public void testToTimestampFunction() throws Exception {
         Assert.assertEquals(1, output4.size());
         Assert.assertEquals(output4.get(0), "result=1970-01-01 00:00:00.0");
     }
+
+    @Test
+    public void testLocalTimeFunction() throws Exception {
+        String transformSql1 = "select localTime() from source";
+        TransformConfig config1 = new TransformConfig(transformSql1);
+        TransformProcessor<String, String> processor1 = TransformProcessor
+                .create(config1, SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        DateTimeFormatter fomatter = DateTimeFormatter.ofPattern("HH:mm:ss");
+        // case1: localTime()
+        List<String> output1 = processor1.transform("", new HashMap<>());
+        LocalTime expectedTime1 = LocalTime.now().withNano(0);
+        LocalTime actualTime1 = LocalTime.parse(output1.get(0).split("=")[1], fomatter);
+        Duration duration1 = Duration.between(expectedTime1, actualTime1);
+        Assert.assertEquals(1, output1.size());
+        Assert.assertTrue(duration1.getSeconds() < 1);
+
+        // case2: currentTime("UTC")
+        String transformSql2 = "select currentTime('UTC') 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("", new HashMap<>());
+        LocalTime expectedTime2 = LocalTime.now(ZoneId.of("UTC")).withNano(0);
+        LocalTime actualTime2 = LocalTime.parse(output2.get(0).split("=")[1], fomatter);
+        Duration duration2 = Duration.between(expectedTime2, actualTime2);
+        Assert.assertEquals(1, output2.size());
+        Assert.assertTrue(duration2.getSeconds() < 1);
+
+        // case 3: localTime("America/New_York")
+        String transformSql3 = "select localTime('America/New_York') 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("", new HashMap<>());
+        LocalTime expectedTime3 = LocalTime.now(ZoneId.of("America/New_York")).withNano(0);
+        LocalTime actualTime3 = LocalTime.parse(output3.get(0).split("=")[1], fomatter);
+        Duration duration3 = Duration.between(expectedTime3, actualTime3);
+        Assert.assertEquals(1, output3.size());
+        Assert.assertTrue(duration3.getSeconds() < 1);
+    }
 }