diff --git a/src/pipeline/src/etl/transform/transformer/greptime/coerce.rs b/src/pipeline/src/etl/transform/transformer/greptime/coerce.rs
index 827613b02b60..35613d00958a 100644
--- a/src/pipeline/src/etl/transform/transformer/greptime/coerce.rs
+++ b/src/pipeline/src/etl/transform/transformer/greptime/coerce.rs
@@ -176,16 +176,23 @@ pub(crate) fn coerce_value(val: &Value, transform: &Transform) -> Result<Option<
         Value::Boolean(b) => coerce_bool_value(*b, transform),
         Value::String(s) => coerce_string_value(s, transform),
 
-        Value::Timestamp(Timestamp::Nanosecond(ns)) => {
-            Ok(Some(ValueData::TimestampNanosecondValue(*ns)))
-        }
-        Value::Timestamp(Timestamp::Microsecond(us)) => {
-            Ok(Some(ValueData::TimestampMicrosecondValue(*us)))
-        }
-        Value::Timestamp(Timestamp::Millisecond(ms)) => {
-            Ok(Some(ValueData::TimestampMillisecondValue(*ms)))
-        }
-        Value::Timestamp(Timestamp::Second(s)) => Ok(Some(ValueData::TimestampSecondValue(*s))),
+        Value::Timestamp(input_timestamp) => match &transform.type_ {
+            Value::Timestamp(target_timestamp) => match target_timestamp {
+                Timestamp::Nanosecond(_) => Ok(Some(ValueData::TimestampNanosecondValue(
+                    input_timestamp.timestamp_nanos(),
+                ))),
+                Timestamp::Microsecond(_) => Ok(Some(ValueData::TimestampMicrosecondValue(
+                    input_timestamp.timestamp_micros(),
+                ))),
+                Timestamp::Millisecond(_) => Ok(Some(ValueData::TimestampMillisecondValue(
+                    input_timestamp.timestamp_millis(),
+                ))),
+                Timestamp::Second(_) => Ok(Some(ValueData::TimestampSecondValue(
+                    input_timestamp.timestamp(),
+                ))),
+            },
+            _ => unimplemented!("Timestamp can only be coerced to another timestamp"),
+        },
 
         Value::Array(_) => unimplemented!("Array type not supported"),
         Value::Map(_) => unimplemented!("Object type not supported"),
diff --git a/src/pipeline/tests/epoch.rs b/src/pipeline/tests/epoch.rs
index 35a2ab635c00..84662793b937 100644
--- a/src/pipeline/tests/epoch.rs
+++ b/src/pipeline/tests/epoch.rs
@@ -200,6 +200,8 @@ transform:
 
 #[test]
 fn test_default_wrong_resolution() {
+    // given a number, we have no ways to guess its resolution
+    // but we can convert resolution during transform phase
     let test_input = r#"
     {
         "input_s": "1722580862",
@@ -209,28 +211,30 @@ fn test_default_wrong_resolution() {
     let pipeline_yaml = r#"
 processors:
   - epoch:
-      fields: 
-        - input_s
-        - input_nano
+      field: input_s
+      resolution: s
+  - epoch:
+      field: input_nano
+      resolution: ns
 
 transform:
   - fields:
       - input_s
-    type: epoch, s
+    type: epoch, ms
   - fields:
       - input_nano
-    type: epoch, nano
+    type: epoch, ms
 "#;
 
     let expected_schema = vec![
         common::make_column_schema(
             "input_s".to_string(),
-            ColumnDataType::TimestampSecond,
+            ColumnDataType::TimestampMillisecond,
             SemanticType::Field,
         ),
         common::make_column_schema(
             "input_nano".to_string(),
-            ColumnDataType::TimestampNanosecond,
+            ColumnDataType::TimestampMillisecond,
             SemanticType::Field,
         ),
         common::make_column_schema(
@@ -242,14 +246,12 @@ transform:
 
     let output = common::parse_and_exec(test_input, pipeline_yaml);
     assert_eq!(output.schema, expected_schema);
-    // this is actually wrong
-    // TODO(shuiyisong): add check for type when converting epoch
     assert_eq!(
         output.rows[0].values[0].value_data,
-        Some(ValueData::TimestampMillisecondValue(1722580862))
+        Some(ValueData::TimestampMillisecondValue(1722580862000))
     );
     assert_eq!(
         output.rows[0].values[1].value_data,
-        Some(ValueData::TimestampMillisecondValue(1722583122284583936))
+        Some(ValueData::TimestampMillisecondValue(1722583122284))
     );
 }
diff --git a/src/pipeline/tests/timestamp.rs b/src/pipeline/tests/timestamp.rs
index cba68d6cb15c..85cf0643fcb5 100644
--- a/src/pipeline/tests/timestamp.rs
+++ b/src/pipeline/tests/timestamp.rs
@@ -318,6 +318,7 @@ transform:
 
 #[test]
 fn test_timestamp_default_wrong_resolution() {
+    // same as test_default_wrong_resolution from epoch tests
     let test_input = r#"
     {
         "input_s": "1722580862",
@@ -327,28 +328,30 @@ fn test_timestamp_default_wrong_resolution() {
     let pipeline_yaml = r#"
 processors:
   - timestamp:
-      fields: 
-        - input_s
-        - input_nano
+      field: input_s
+      resolution: s
+  - timestamp:
+      field: input_nano
+      resolution: ns
 
 transform:
   - fields:
       - input_s
-    type: timestamp, s
+    type: timestamp, ms
   - fields:
       - input_nano
-    type: timestamp, nano
+    type: timestamp, ms
 "#;
 
     let expected_schema = vec![
         common::make_column_schema(
             "input_s".to_string(),
-            ColumnDataType::TimestampSecond,
+            ColumnDataType::TimestampMillisecond,
             SemanticType::Field,
         ),
         common::make_column_schema(
             "input_nano".to_string(),
-            ColumnDataType::TimestampNanosecond,
+            ColumnDataType::TimestampMillisecond,
             SemanticType::Field,
         ),
         common::make_column_schema(
@@ -360,14 +363,12 @@ transform:
 
     let output = common::parse_and_exec(test_input, pipeline_yaml);
     assert_eq!(output.schema, expected_schema);
-    // this is actually wrong
-    // TODO(shuiyisong): add check for type when converting epoch
     assert_eq!(
         output.rows[0].values[0].value_data,
-        Some(ValueData::TimestampMillisecondValue(1722580862))
+        Some(ValueData::TimestampMillisecondValue(1722580862000))
     );
     assert_eq!(
         output.rows[0].values[1].value_data,
-        Some(ValueData::TimestampMillisecondValue(1722583122284583936))
+        Some(ValueData::TimestampMillisecondValue(1722583122284))
     );
 }