Added the compatibility of some system functions used in PgBench.
What is changed and how it works?
What's Changed:
In the expression package, complete the logical implementation of some functions,modify the bug of the previous system function,and add unit tests for these system functions.
What problem does this PR solve?
Added the compatibility of some system functions used in PgBench.
What is changed and how it works?
What's Changed:
In the expression package, complete the logical implementation of some functions,modify the bug of the previous system function,and add unit tests for these system functions.