expression: add implicit eval int and real for function dayname (#21806)#21850

Merged

qw4990 merged 5 commits intopingcap:release-4.0from ti-srebot:release-4.0-556ccccdeb83

Jan 27, 2021

+95-16

Commits on Dec 17, 2020

cherry pick pingcap#21806 to release-4.0

zanmato1984
authored and
ti-srebot
committed