lightning: fix typo because lightning supports sql/parquet data files but csv.

[joccau]

What problem does this PR solve?

As title.

Issue Number: close #48654

Problem Summary:

• the comments is "source csv files is proper" when lightning imports the parquet data files, which could confuse the DBA.

What is changed and how it works?

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.

manual test

• after fix it

+----+------------------------------------------------------------------------------------------------------------------------------------+-------------+--------+
|  # | CHECK ITEM                                                                                                                         | TYPE        | PASSED |
+----+------------------------------------------------------------------------------------------------------------------------------------+-------------+--------+
|  1 | Source data files size is proper                                                                                                   | performance | true   |
+----+------------------------------------------------------------------------------------------------------------------------------------+-------------+--------+
|  2 | the checkpoints are valid                                                                                                          | critical    | true   |
+----+------------------------------------------------------------------------------------------------------------------------------------+-------------+--------+
|  3 | table schemas are valid                                                                                                            | critical    | true   |
+----+------------------------------------------------------------------------------------------------------------------------------------+-------------+--------+

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

[codecov]

Codecov Report

Merging #48655 (cb707e3) into master (1b58a8d) will increase coverage by 1.5742%.
Report is 4 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48655        +/-   ##
================================================
+ Coverage   71.1823%   72.7566%   +1.5742%     
================================================
  Files          1365       1389        +24     
  Lines        404155     411443      +7288     
================================================
+ Hits         287687     299352     +11665     
+ Misses        96537      93229      -3308     
+ Partials      19931      18862      -1069     

Flag	Coverage Δ
integration	43.7790% <ø> (?)
unit	71.1883% <100.0000%> (+0.0060%)	⬆️

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

Components	Coverage Δ
dumpling	53.9874% <ø> (ø)
parser	∅ <ø> (∅)
br	48.8458% <100.0000%> (-4.2596%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: glorv, lance6716

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-17 04:05:48.300106778 +0000 UTC m=+4394745.887216908: ☑️ agreed by lance6716.
• 2023-11-17 04:14:12.13597649 +0000 UTC m=+4395249.723086620: ☑️ agreed by glorv.

[tiprow]

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[glorv]

/retest

[joccau]

/merge

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