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[MINOR] use Option and fix description in toString method (#1527)

* [MINOR] fix some places are not elegant, as a newcomer

* [MINOR] fix some places are not elegant, as a newcomer
This commit is contained in:
baobaoyeye
2020-04-18 12:51:37 +08:00
committed by GitHub
parent acb1ada2f7
commit 75523657a4
3 changed files with 9 additions and 21 deletions