expression：PostgreSQL system function support#64

Merged

pupillord merged 2 commits intoDigitalChinaOpenSource:mainfrom Orion7r:pg-system-function-support

Sep 13, 2021

+183-12

Commits on Sep 10, 2021

Added the logic realization of some system functions.
Orion7r
committed

Commits on Sep 13, 2021

update DCParser version
Orion7r
committed