Fix: use CONCAT with CAST to create interval for DATETIME_ADD

[flybitcone]

Change the interval and CROSS JOIN function

[flybitcone]

The check is not pass may be due to the Python version in the test environment.

Pls check the error in detain: Run actions/setup-python@v2 Version 3.7 was not found in the local cache Error: Version 3.7 with arch x64 not found

Thanks.