add more explains and examples for `SELECT ... INTO OUTFILE` statements (#15104)#15511

Merged

ti-chi-bot[bot] merged 2 commits intopingcap:release-7.3from ti-chi-bot:cherry-pick-15104-to-release-7.3

Nov 29, 2023

+77-9

Commits on Nov 28, 2023

This is an automated cherry-pick of pingcap#15104

qw4990
authored and
ti-chi-bot
committed

Commits on Nov 29, 2023

resolve conflicts
qiancai
authored