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support global kill
What problem does this PR solve?
Issue Number: pingcap/tidb#8854
Problem Summary: Support CTRL-C or KILL to kill a connection/query.
What is changed and how it works?
Compose a global unique connection id by a unique server id and local unique connection id. See design doc and pingcap/tidb#17649 for detail.
This PR fix comment of TiDBExtension for consistence.
Check List
Tests
- No code
/rebuild
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