*: use int instead of fmt.Stringer as executor id

[crazycs520]

What problem does this PR solve?

fix #18899

• Use int (plan id) instead of fmt.Stringer as executor id

• Add SearchTrackerWithoutLock for Tracker to avoid needless lock:

benchmark

For big-quey like union with 10000 select statement:

        // generate SQL
	buf := bytes.NewBuffer(make([]byte, 0, 1024*1024*4))
	for i := 0; i < 10000; i++ {
		if i > 0 {
			buf.WriteString(" union ")
		}
		buf.WriteString(fmt.Sprintf("select count(1) as num,a from t where a='%v' group by a", i))
	}
	query := buf.String()

benchmark the core.EncodePlan function, this pr almost 25 times faster than before.

// before this PR:
12.93s

// This PR:
0.516s

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• No logical Code.

Side effects

• No

Release note

• Optimize the performance of encoding plan.

[codecov]

Codecov Report

Merging #19207 into master will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master     #19207   +/-   ##
===========================================
  Coverage   79.4944%   79.4944%           
===========================================
  Files           549        549           
  Lines        152432     152432           
===========================================
  Hits         121175     121175           
  Misses        21724      21724           
  Partials       9533       9533           

[crazycs520]

/bench

[sre-bot]

Benchmark Report

Run Sysbench Performance Test on VMs

@@                               Benchmark Diff                               @@
================================================================================
--- tidb: a4d26bd57c8cd3bf7605912cec89fc1a538ebc88
+++ tidb: e14b57c6bc1521827db7fb55014542cebf81226f
tikv: ae7a6ecee6e3367da016df0293a9ffe9cc2b5705
pd: ec99270dfe418971fd8c62b87d23296fffa12265
================================================================================
oltp_update_index:
    * QPS: 16632.75 ± 0.43% (std=54.09) delta: -0.21% (p=0.458)
    * Latency p50: 7.69 ± 0.45% (std=0.03) delta: 0.24%
    * Latency p99: 15.55 ± 0.00% (std=0.00) delta: 0.91%
            
oltp_insert:
    * QPS: 20777.02 ± 0.18% (std=27.78) delta: 1.57% (p=0.017)
    * Latency p50: 6.16 ± 0.16% (std=0.01) delta: -1.48%
    * Latency p99: 12.52 ± 0.00% (std=0.00) delta: -1.80%
            
oltp_update_non_index:
    * QPS: 20978.87 ± 0.41% (std=61.64) delta: -0.15% (p=0.446)
    * Latency p50: 6.10 ± 0.45% (std=0.02) delta: 0.12%
    * Latency p99: 12.75 ± 0.00% (std=0.00) delta: 0.00%
            
oltp_read_write:
    * QPS: 30995.52 ± 0.22% (std=46.45) delta: 0.05% (p=0.678)
    * Latency p50: 83.53 ± 0.23% (std=0.14) delta: -0.04%
    * Latency p99: 148.95 ± 0.90% (std=1.34) delta: 0.91%
            
oltp_point_select:
    * QPS: 66020.60 ± 0.85% (std=377.42) delta: -0.95% (p=0.069)
    * Latency p50: 1.94 ± 0.34% (std=0.00) delta: 1.22%
    * Latency p99: 8.90 ± 0.00% (std=0.00) delta: 3.73%
            

[winoros]

lgtm

[qw4990]

LGTM

[crazycs520]

/run-all-tests

[crazycs520]

/run-unit-test

[crazycs520]

/run-all-tests

[crazycs520]

/run-integration-copr-test
/run-common-test

[crazycs520]

/run-integration-common-test

[ti-srebot]

cherry pick to release-4.0 in PR #19279