Merge remote-tracking branch 'origin/main'

Merge pull request MyCATApache#551 from MyCATApache/1.19-fix

1.19 fix

fix wrong update targetname

resupport same target have multi connection in transaction

fix test

improve cast expr

improve log

debug

fix test

Merge branch 'main' of https://github.com/MyCATApache/Mycat2