Tips

• Thanks very much for contributing to Apache DolphinScheduler.
• Please review https://dolphinscheduler.apache.org/en-us/community/index.html before opening a pull request.

What is the purpose of the pull request

fix bug(#3324 ) there exists some problems in checking task dependency

Brief change log

(for example:)

• Add maven-checkstyle-plugin to root pom.xml

Verify this pull request

(Please pick either of the following options)

This pull request is code cleanup without any test coverage.

(or)

This pull request is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added dolphinscheduler-dao tests for end-to-end.
• Added CronUtilsTest to verify the change.
• Manually verified the change by testing locally.