yfsn666 commented on code in PR #10772:
URL: https://github.com/apache/inlong/pull/10772#discussion_r1716276678


##########
inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/TestTransformTemporalFunctionsProcessor.java:
##########
@@ -183,4 +183,37 @@ public void testDateExtractFunction() throws Exception {
         Assert.assertEquals(1, output6.size());
         Assert.assertEquals(output6.get(0), "result=29");
     }
+
+    @Test
+    public void testTimestampExtractFunction() throws Exception {
+        String transformSql1 = "select hour(string1) from source";
+        TransformConfig config1 = new TransformConfig(transformSql1);
+        TransformProcessor<String, String> processor1 = TransformProcessor
+                .create(config1, 
SourceDecoderFactory.createCsvDecoder(csvSource),
+                        SinkEncoderFactory.createKvEncoder(kvSink));
+        // case1: hour(2024-08-12 12:23:34)
+        List<String> output1 = processor1.transform("2024-08-12 12:23:34", new 
HashMap<>());
+        Assert.assertEquals(1, output1.size());
+        Assert.assertEquals(output1.get(0), "result=12");

Review Comment:
   the ouput format is kv,the key is "result" and the value is the transformed 
value, so the transform result is a string "result=12"



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