KurtYoung commented on a change in pull request #10105: 
[Flink-14599][table-planner-blink] Support precision of TimestampType in blink 
planner
URL: https://github.com/apache/flink/pull/10105#discussion_r345562099
 
 

 ##########
 File path: 
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/codegen/GenerateUtils.scala
 ##########
 @@ -370,8 +373,56 @@ object GenerateUtils {
         generateNonNullLiteral(literalType, literalValue.toString, 
literalValue)
 
       case TIMESTAMP_WITHOUT_TIME_ZONE =>
-        val millis = literalValue.asInstanceOf[Long]
-        generateNonNullLiteral(literalType, millis + "L", millis)
+        def getNanoOfMillisSinceEpoch(timestampString: TimestampString): Int = 
{
+          val v = timestampString.toString()
+          val length = v.length
+          val nanoOfSeconds = length match {
+            case 19 | 20 => 0
+            case _ =>
+              JInteger.valueOf(v.substring(20)) * pow(10, 9 - (length - 
20)).intValue()
+          }
+          nanoOfSeconds % 1000000
+        }
+
+        // TODO: we copied the logical of TimestampString::getMillisSinceEpoch 
since the copied
+        //  DateTimeUtils.ymdToJulian is wrong.
 
 Review comment:
   I would like to create another issue for this, since I don't think the 
author of FLINK-11935 will be aware of these codes and remove them. 

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