leonardBang commented on a change in pull request #15485:
URL: https://github.com/apache/flink/pull/15485#discussion_r607480013



##########
File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/api/TableSchema.java
##########
@@ -519,18 +520,19 @@ private static void validateColumnsAndWatermarkSpecs(
                                                     String.format(
                                                             "Rowtime attribute 
'%s' is not defined in schema.",
                                                             
rowtimeAttribute)));
-            if (rowtimeType.getTypeRoot() != TIMESTAMP_WITHOUT_TIME_ZONE) {
+            if (!(rowtimeType.getTypeRoot() == 
LogicalTypeRoot.TIMESTAMP_WITH_LOCAL_TIME_ZONE
+                    || rowtimeType.getTypeRoot() == 
LogicalTypeRoot.TIMESTAMP_WITHOUT_TIME_ZONE)) {
                 throw new ValidationException(
                         String.format(
-                                "Rowtime attribute '%s' must be of type 
TIMESTAMP but is of type '%s'.",
+                                "Rowtime attribute '%s' must be of type 
TIMESTAMP or TIMESTAMP_LTZ but is of type '%s'.",
                                 rowtimeAttribute, rowtimeType));
             }
             LogicalType watermarkOutputType =
                     watermark.getWatermarkExprOutputType().getLogicalType();
-            if (watermarkOutputType.getTypeRoot() != 
TIMESTAMP_WITHOUT_TIME_ZONE) {
+            if (!supportedWatermarkType(watermarkOutputType)) {

Review comment:
       I think we can keep current check logic which can pass  TIMESTAMP with 
any precision, LogicalType quality considered the precision which will break 
compatibility.




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