planner: suppress column number in plan_tree explain

[terry1purcell]

What problem does this PR solve?

Issue Number: ref #63118

Problem Summary:

What changed and how does it work?

Both EXPLAIN FORMAT=PLAN_TREE & FORMAT=BRIEF will remove the "physical operator numbers" from the explain output - to reduce those numbers causing irrelevant changes to optimizer tests. But that does NOT apply to the "physical operator number" assigned to each column in the plan.

This PR removes the "Column#num" suffix from EXPLAIN FORMAT=PLAN_TREE.

This does not extend to FORMAT=BRIEF simply because there are already 90+ file changes in this PR. FORMAT=BRIEF can be targeted in a separate PR.

Claude code's review is here:

75 Integration Test Result Files (.result files):
All changes in these files are exclusively column suffix removals. Every change follows this
pattern:

• Column#5 → Column
• Column#7 → Column
• Column#10 → Column
• etc.

Examples from the diff:

• HashAgg root group by:Column#5, funcs:firstrow(Column#5)->Column#5

• HashAgg root group by:Column, funcs:firstrow(Column)->Column

• funcs:avg(Column#9, Column#10)->Column#5

• funcs:avg(Column, Column)->Column

Non-Test File Changes (2 files):

1. pkg/planner/core/common_plans.go - Adds the removeColumnNumbers() function to strip column
   number suffixes in plan_tree format

Verification:
✅ CONFIRMED: The only changes to test files are column suffix removals (e.g., Column#14 →
Column)
✅ CONFIRMED: No other modifications to test content, logic, or structure
✅ CONFIRMED: All 76 test files follow the exact same pattern
The changes are clean and consistent across all test files - purely cosmetic removal of column
number suffixes with no functional changes to the tests themselves.

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

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[ti-chi-bot]

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Details

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[Copilot]

Pull request overview

This pull request suppresses column numbers in plan_tree explain output format, changing references like Column#6 to simply Column throughout the execution plans. This cosmetic change aims to simplify the explain output and make it more readable by removing internal column identifiers that are not typically meaningful to end users.

Key changes:

• Removed numeric suffixes from column references in plan tree output (e.g., Column#6->Column#7 becomes Column->Column)
• Updated all test result files to reflect this change in explain format output
• No actual code functionality changes - only presentation of explain plans

Reviewed changes

Copilot reviewed 77 out of 77 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/integrationtest/r/window_function.result	Updated window function explain outputs to use Column instead of numbered columns
tests/integrationtest/r/util/ranger.result	Updated explain outputs for index range scan queries
tests/integrationtest/r/tpch.result	Updated TPC-H benchmark query explain outputs
tests/integrationtest/r/topn_pushdown.result	Updated TopN pushdown explain outputs
tests/integrationtest/r/table/partition.result	Updated partition-related explain outputs
tests/integrationtest/r/subquery.result	Updated subquery explain outputs
tests/integrationtest/r/session/clustered_index.result	Updated clustered index explain outputs
tests/integrationtest/r/select.result	Updated various select query explain outputs
tests/integrationtest/r/planner/core/*.result	Updated numerous planner test explain outputs across multiple subdirectories
tests/integrationtest/r/null_rejected.result	Updated null rejection explain outputs
tests/integrationtest/r/infoschema/infoschema.result	Updated information schema explain outputs
tests/integrationtest/r/expression/misc.result	Updated expression-related explain outputs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.2530%. Comparing base (1e08348) to head (6a73fd7).
⚠️ Report is 6 commits behind head on master.

⚠️ Current head 6a73fd7 differs from pull request most recent head 36e3645

Please upload reports for the commit 36e3645 to get more accurate results.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65148        +/-   ##
================================================
- Coverage   70.7452%   68.2530%   -2.4922%     
================================================
  Files          1895       1872        -23     
  Lines        517984     510232      -7752     
================================================
- Hits         366449     348249     -18200     
- Misses       127012     139565     +12553     
+ Partials      24523      22418      -2105     

Flag	Coverage Δ
integration	41.5383% <100.0000%> (-6.6325%)	⬇️

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

Components	Coverage Δ
dumpling	52.7568% <ø> (ø)
parser	∅ <ø> (∅)
br	38.3735% <ø> (-19.8240%)	⬇️

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[Copilot]

Pull request overview

Copilot reviewed 78 out of 89 changed files in this pull request and generated no new comments.

[terry1purcell]

/ok-to-test

[tiprow]

@terry1purcell: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	36e3645	link	true	/test fast_test_tiprow

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[ti-chi-bot]

@terry1purcell: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-unit-test-next-gen	36e3645	link	true	/test pull-unit-test-next-gen
idc-jenkins-ci-tidb/unit-test	36e3645	link	true	/test unit-test

Full PR test history. Your PR dashboard.

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