Analyze cannot be cancelled promptly #65818

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

  1. Create a table and insert some rows.
  2. Enable a failpoint to stall analyze RPC or NextRaw (e.g. a sleep in analyze pushdown).
  3. Run ANALYZE TABLE t in one session.
  4. From another session, issue KILL QUERY <conn_id>.

2. What did you expect to see? (Required)

The ANALYZE job should terminate quickly after KILL QUERY, and its RPC/streaming should stop without blocking workers.

3. What did you see instead (Required)

The analyze worker blocks on RPC/NextRaw; the job does not exit promptly after kill, and the analyze execution can hang.

4. What is your TiDB version? (Required)

d731491