ddl: validate table info before doing ddl job to avoid load infoschem…

…a error (pingcap#10464) (pingcap#10547)

infoschema, domain, ddl: fix upper cased charset names (pingcap#10272) (

pingcap#10354)

*: support `select`/ `explain select` using bind info (pingcap#10284)

table, infoschema, executor: fix Charset/Collation shown in column(pi…

…ngcap#10007) (pingcap#10114)

CHANGELOG: add release notes for v2.1.7 (pingcap#9916)

test: open coverpkg for coverrage, speed up the test, calculate more …

…folder. (pingcap#9725)

CHANGELOG: add release notes for v2.1.6 (pingcap#9747)

CHANGELOG: add changelog for v2.1.5 (pingcap#9501)

changelog: add release note v2.1.4 (pingcap#9312)

CHANGELOG: add release notes for v2.1.3 (pingcap#9174)