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statistics: add comments and remove unnessary check #53568

Merged
merged 3 commits into from
May 27, 2024
Merged

statistics: add comments and remove unnessary check #53568

merged 3 commits into from
May 27, 2024

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Rustin170506
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What problem does this PR solve?

Issue Number: ref #53567

Problem Summary:

What changed and how does it work?

  1. I added some comments to the GetPredicateColumns function.
  2. Remove an unnecessary check, because the column id is always not null. You can find it in the schema:
	CreateColumnStatsUsageTable = `CREATE TABLE IF NOT EXISTS mysql.column_stats_usage (
		table_id BIGINT(64) NOT NULL,
		column_id BIGINT(64) NOT NULL,
		last_used_at TIMESTAMP,
		last_analyzed_at TIMESTAMP,
		PRIMARY KEY (table_id, column_id) CLUSTERED
	);`
  1. Added a TODO item to indicate the need to reconsider this design.

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

@Rustin170506
refactor: add comments and remove unnessary check
cca1341 
Signed-off-by: hi-rustin <rustin.liu@gmail.com>
@ti-chi-bot ti-chi-bot bot added release-note-none Denotes a PR that doesn't merit a release note. sig/planner SIG: Planner size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels May 27, 2024
@Rustin170506
fix: better comments
6ac2775 
Signed-off-by: hi-rustin <rustin.liu@gmail.com>
Rustin170506
Rustin170506 commented May 27, 2024
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🔢 Self-check (PR reviewed by myself and ready for feedback.)

@Rustin170506
fix: rename name
6424eff 
Signed-off-by: hi-rustin <rustin.liu@gmail.com>
@ti-chi-bot ti-chi-bot bot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels May 27, 2024
Rustin170506
Rustin170506 commented May 27, 2024
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🔢 Self-check (PR reviewed by myself and ready for feedback.)

pkg/statistics/handle/usage/predicate_column.go
if err != nil {
return nil, errors.Trace(err)
}
columnIDs := make([]int64, 0, len(rows))
for _, row := range rows {
if row.IsNull(0) || row.IsNull(1) {
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Removed the first check here.

pkg/statistics/handle/usage/predicate_column.go
// `set global enable_column_tracking = 0` indicates all the predicate columns collected before.
// If `last_used_at` is before the time when `set global tidb_enable_column_tracking = 0`, we don't regard the column as predicate column because
// `set global tidb_enable_column_tracking = 0` indicates all the predicate columns collected before.
// TODO: Why do we need to do this? If column tracking is already disabled, we should not collect any column usage.
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I will discuss it with roger.

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codecov bot commented May 27, 2024 •
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Codecov Report

Attention: Patch coverage is 94.11765% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 74.5982%. Comparing base (d24fdb7) to head (6424eff).
Report is 6 commits behind head on master.

Additional details and impacted files 
@@               Coverage Diff                @@
##             master     #53568        +/-   ##
================================================
+ Coverage   72.4150%   74.5982%   +2.1831%     
================================================
  Files          1505       1505                
  Lines        430553     430883       +330     
================================================
+ Hits         311785     321431      +9646     
+ Misses        99448      89588      -9860     
- Partials      19320      19864       +544
Flag Coverage Δ
integration 49.4698% <0.0000%> (?)
unit 71.4252% <94.1176%> (+0.0352%) ⬆️

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 50.4572% <ø> (+9.0701%) ⬆️

@ti-chi-bot ti-chi-bot bot added approved needs-1-more-lgtm Indicates a PR needs 1 more LGTM. labels May 27, 2024
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/retest

elsa0520
elsa0520 approved these changes May 27, 2024
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LGTM

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ti-chi-bot bot commented May 27, 2024

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elsa0520, qw4990

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@ti-chi-bot ti-chi-bot bot added lgtm and removed needs-1-more-lgtm Indicates a PR needs 1 more LGTM. labels May 27, 2024
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ti-chi-bot bot commented May 27, 2024

[LGTM Timeline notifier]

Timeline:

  • 2024-05-27 07:55:01.791022738 +0000 UTC m=+2676655.548158311: ☑️ agreed by qw4990.
  • 2024-05-27 08:42:07.589084123 +0000 UTC m=+2679481.346219693: ☑️ agreed by elsa0520.

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/retest

@ti-chi-bot ti-chi-bot bot merged commit 2300ac6 into pingcap:master May 27, 2024
23 checks passed
@Rustin170506 Rustin170506 deleted the rustin-patch-disable-tracking branch May 27, 2024 14:36
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