关于flink时区问题

[Geoff nie]

大佬，请教下，我执行如下语句，发现如下报错，这是lib下面少了什么jar包嘛还是？谢谢
Flink SQL> SELECT TO_TIMESTAMP_LTZ(4001, 3);
[ERROR] Could not execute SQL statement. Reason:
org.apache.calcite.sql.validate.SqlValidatorException: No match found for 
function signature TO_TIMESTAMP_LTZ(<NUMERIC>, <NUMERIC>)