*: add trace support for subquery

[tiancaiamao]

What problem does this PR solve?

Building a query plan may execute the subquery, but I've no idea what's happening.
For example, I don't why executor.Compile takes so long.

mysql> trace format='row'  select 1, (select sleep(1));
+---------------------------------------+-----------------+--------------+
| operation                             | startTS         | duration     |
+---------------------------------------+-----------------+--------------+
| session.getTxnFuture                  | 20:56:25.071109 | 7.453µs      |
|   ├─session.Execute                   | 20:56:25.071102 | 1.001027416s |
|   ├─session.ParseSQL                  | 20:56:25.071230 | 97.145µs     |
|   ├─executor.Compile                  | 20:56:25.071386 | 1.000643885s |
|   ├─session.runStmt                   | 20:56:26.072058 | 43.809µs     |
|   ├─session.CommitTxn                 | 20:56:26.072090 | 3.509µs      |
|   ├─*executor.ProjectionExec.Next     | 20:56:26.072138 | 5.418µs      |
|   ├─*executor.TableDualExec.Next      | 20:56:26.072139 | 349ns        |
|   ├─*executor.ProjectionExec.Next     | 20:56:26.072148 | 7.049µs      |
|   └─*executor.TableDualExec.Next      | 20:56:26.072150 | 341ns        |
+---------------------------------------+-----------------+--------------+
10 rows in set (1.00 sec)

In this commit, the trace support for subquery is added.
After this change, I know that executor.Compile is slow because it enters the EvalSubQuery function from the following output:

mysql> trace format='row'  select 1, (select sleep(1));
+---------------------------------------+-----------------+--------------+
| operation                             | startTS         | duration     |
+---------------------------------------+-----------------+--------------+
| session.getTxnFuture                  | 20:55:32.007173 | 7.54µs       |
|   ├─session.Execute                   | 20:55:32.007166 | 1.003288171s |
|   ├─session.ParseSQL                  | 20:55:32.007295 | 93.867µs     |
|   ├─executor.Compile                  | 20:55:32.007458 | 1.002949077s |
|   ├─executor.EvalSubQuery             | 20:55:32.007761 | 1.002603472s |
|   ├─*executor.MaxOneRowExec.Next      | 20:55:32.007804 | 1.002550013s |
|   ├─*executor.ProjectionExec.Next     | 20:55:32.007811 | 1.002498283s |
|   ├─*executor.TableDualExec.Next      | 20:55:32.007819 | 2.991µs      |
|   ├─*executor.ProjectionExec.Next     | 20:55:33.010342 | 8.316µs      |
|   ├─*executor.TableDualExec.Next      | 20:55:33.010345 | 518ns        |
|   ├─*executor.MaxOneRowExec.Next      | 20:55:33.010360 | 511ns        |
|   ├─session.runStmt                   | 20:55:33.010418 | 19.784µs     |
|   ├─session.CommitTxn                 | 20:55:33.010431 | 2.551µs      |
|   ├─*executor.ProjectionExec.Next     | 20:55:33.010460 | 6.054µs      |
|   ├─*executor.TableDualExec.Next      | 20:55:33.010461 | 319ns        |
|   ├─*executor.ProjectionExec.Next     | 20:55:33.010470 | 4.241µs      |
|   └─*executor.TableDualExec.Next      | 20:55:33.010471 | 287ns        |
+---------------------------------------+-----------------+--------------+
17 rows in set (1.00 sec)

The result should display in a tree format view, I'll investigate the bug in the next PR.

What is changed and how it works?

Add context.Context to many functions parameter until adding this code is possible in plannercore.EvalSubquery:

if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
  span1 := span.Tracer().StartSpan("executor.EvalSubQuery", opentracing.ChildOf(span.Context()))
  defer span1.Finish()
}

Check List

Tests

• No code

Code changes

• Has exported function/method change

Related changes

• Need to cherry-pick to the release branch

[tiancaiamao]

PTAL @zz-jason @jackysp

[codecov]

Codecov Report

Merging #11182 into master will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master     #11182   +/-   ##
===========================================
  Coverage   82.1068%   82.1068%           
===========================================
  Files           425        425           
  Lines         94360      94360           
===========================================
  Hits          77476      77476           
  Misses        11488      11488           
  Partials       5396       5396

[tiancaiamao]

/run-all-tests

[tiancaiamao]

PTAL @zz-jason @jackysp

[jackysp]

LGTM

[zz-jason]

LGTM

[zz-jason]

/run-all-tests

[zz-jason]

@tiancaiamao CI failed.

[tiancaiamao]

/run-all-tests

[zz-jason]

LGTM

[sre-bot]

/run-all-tests

[sre-bot]

@tiancaiamao merge failed.

[tiancaiamao]

/rebuild

[sre-bot]

/run-all-tests

[sre-bot]

success

[sre-bot]

cherry pick to release-3.0 failed