*: improve log about stale-read query

[crazycs520]

What problem does this PR solve?

Issue Number: close #52492 #45545

Problem Summary: improve log about stale-read query

What changed and how does it work?

Log

Before this PR, timestamp field in log is 0 when executing stale-read query.

This PR, timestamp field is stale-read ts.

[2024/04/11 13:40:12.617 +08:00] [INFO] [conn.go:1152] ["command dispatched failed"] [conn=2097154] [session_alias=] [connInfo="id:2097154, addr:127.0.0.1:49367 status:10, collation:utf8_general_ci, user:root"] [command=Query] [status="inTxn:0, autocommit:1"] [sql="select /*+ MAX_EXECUTION_TIME(10), SET_VAR(TIKV_CLIENT_READ_TIMEOUT=5) */ * from t as of timestamp NOW() - INTERVAL 1 SECOND"] [txn_mode=PESSIMISTIC] [timestamp=449003916099584000] [err="[executor:3024]Query execution was interrupted, maximum statement execution time exceeded\ngithub.com/pingcap/errors.AddStack\n\t/Users/cs/code/goread/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20240318064555-6bd07397691f/errors.go:178\ngithub.com/pingcap/errors.(*Error).GenWithStackByArgs\n\t/Users/cs/code/goread/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20240318064555-6bd07397691f/normalize.go:175\ngithub.com/pingcap/tidb/pkg/util/sqlkiller.(*SQLKiller).HandleSignal\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/util/sqlkiller/sqlkiller.go:68\ngithub.com/pingcap/tidb/pkg/executor/internal/exec.(*executorKillerHandler).HandleSQLKillerSignal\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/executor/internal/exec/executor.go:251\ngithub.com/pingcap/tidb/pkg/executor/internal/exec.Next\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/executor/internal/exec/executor.go:409\ngithub.com/pingcap/tidb/pkg/executor.(*ExecStmt).next\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/executor/adapter.go:1209\ngithub.com/pingcap/tidb/pkg/executor.(*recordSet).Next\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/executor/adapter.go:158\ngithub.com/pingcap/tidb/pkg/server/internal/resultset.(*tidbResultSet).Next\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/internal/resultset/resultset.go:64\ngithub.com/pingcap/tidb/pkg/server.(*clientConn).writeChunks\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/conn.go:2317\ngithub.com/pingcap/tidb/pkg/server.(*clientConn).writeResultSet\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/conn.go:2260\ngithub.com/pingcap/tidb/pkg/server.(*clientConn).handleStmt\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/conn.go:2053\ngithub.com/pingcap/tidb/pkg/server.(*clientConn).handleQuery\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/conn.go:1775\ngithub.com/pingcap/tidb/pkg/server.(*clientConn).dispatch\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/conn.go:1349\ngithub.com/pingcap/tidb/pkg/server.(*clientConn).Run\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/conn.go:1113\ngithub.com/pingcap/tidb/pkg/server.(*Server).onConn\n\t/Users/cs/code/goread/src/github.com/pingcap/tidb/pkg/server/server.go:737\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_arm64.s:1197"]

Slow log

Before This PR

The slow log of stale-read query is the following, Txn_start_ts is 0, which is unexpected.

...
# Txn_start_ts: 0
...
select * from t;

This PR

...
# Txn_start_ts: 448987604713472000
...
select * from t;

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @crazycs520. Thanks for your PR.

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[codecov]

Codecov Report

Merging #52494 (baa42ac) into master (5872ccd) will increase coverage by 2.1722%.
Report is 17 commits behind head on master.
The diff coverage is 69.2307%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #52494        +/-   ##
================================================
+ Coverage   72.2059%   74.3781%   +2.1722%     
================================================
  Files          1469       1470         +1     
  Lines        427109     432124      +5015     
================================================
+ Hits         308398     321406     +13008     
+ Misses        99536      90748      -8788     
- Partials      19175      19970       +795     

Flag	Coverage Δ
integration	49.0229% <69.2307%> (?)
unit	71.1882% <69.2307%> (+0.0898%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	49.7964% <ø> (+8.6997%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-11 05:49:34.775280985 +0000 UTC m=+1114236.302821553: ☑️ agreed by MyonKeminta.
• 2024-04-12 09:55:31.122517039 +0000 UTC m=+1215392.650057584: ☑️ agreed by zyguan.

[crazycs520]

/retest-required

[tiprow]

@crazycs520: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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[easonn7]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: easonn7, MyonKeminta, qw4990, zyguan

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Needs approval from an approver in each of these files:

• OWNERS [MyonKeminta,qw4990,zyguan]
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• pkg/sessionctx/variable/OWNERS [easonn7]

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