[fix](query-forward) Fix forward query exception or stuck or potential query result loss (#41303) #42382
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…l query result loss (apache#41303) 1. Fix forward query exception if no status code is set in master execution. EOF may result in this status. 2. Fix forward query stuck due to no result packet sent to mysql channel. Should use result packets from master. 3. Fix potential forward query result loss if follower can read status change during query process. Should judge by the status once before execution. 4. Add assertion for regression test.
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Proposed changes
Fix forward query exception if no status code is set in master execution. EOF may result in this status.
Fix forward query stuck due to no result packet sent to mysql channel. Should use result packets from master.
Fix potential forward query result loss if follower can read status change during query process. Should judge by the status once before execution.
Add assertion for regression test.