importinto: encode and ingest step use task keyspace in nextgen

[tangenta]

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

Run import into subtasks at system keyspace tidb.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

  -- ks1 tidb
  mysql> create table t (a int);
  Query OK, 0 rows affected (0.15 sec)
  
  mysql> import into t from "s3://test/*?access-key=minioadmin&secret-access-key=minioadmin&endpoint=http://127.0.0.1:9000&force
  -path-style=true" with SKIP_ROWS=1;
  +--------+---------------------------------------------------------------------------------------------------------------------+--------------+----------+-------+----------+------------------+---------------+----------------+----------------------------+----------------------------  +----------------------------+------------+
  | Job_ID | Data_Source                                                                                                         | Target_Table | Table_ID | Phase | Status   | Source_File_Size | Imported_Rows | Result_Message | Create_Time                |   Start_Time                 | End_Time                   | Created_By |
  +--------+---------------------------------------------------------------------------------------------------------------------+--------------+----------+-------+----------+------------------+---------------+----------------+----------------------------+----------------------------  +----------------------------+------------+
  |      1 | s3://test/*?access-key=xxxxxx&endpoint=http%3A%2F%2F127.0.0.1%3A9000&force-path-style=true&secret-access-key=xxxxxx | `test`.`t`   |      114 |       | finished | 8B               |             1 |                | 2025-07-03 14:44:21.479238 | 2025-07-03 14:44:22.  264945 | 2025-07-03 14:44:25.784353 | root@%     |
  +--------+---------------------------------------------------------------------------------------------------------------------+--------------+----------+-------+----------+------------------+---------------+----------------+----------------------------+----------------------------  +----------------------------+------------+
  1 row in set (4.67 sec)
  mysql> select * from t;
  '+------+
  | a    |
  +------+
  |    1 |
  +------+
  1 row in set (0.00 sec)

  -- system tidb
  mysql> select id, task_key, type, state, keyspace from mysql.tidb_global_task_history;
  +----+------------------+------------+---------+----------+
  | id | task_key         | type       | state   | keyspace |
  +----+------------------+------------+---------+----------+
  |  1 | ks1/ImportInto/1 | ImportInto | succeed | ks1      |
  +----+------------------+------------+---------+----------+
  1 row in set (0.00 sec)

• 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

[tiprow]

Hi @tangenta. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 54.28571% with 16 lines in your changes missing coverage. Please review.

Project coverage is 73.7949%. Comparing base (64b3755) to head (955d262).
Report is 9 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #62138        +/-   ##
================================================
+ Coverage   72.8759%   73.7949%   +0.9190%     
================================================
  Files          1740       1770        +30     
  Lines        483032     492520      +9488     
================================================
+ Hits         352014     363455     +11441     
+ Misses       109427     106883      -2544     
- Partials      21591      22182       +591     

Flag	Coverage Δ
integration	45.2851% <0.0000%> (?)
unit	72.4295% <54.2857%> (+0.3147%)	⬆️

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	46.3528% <ø> (+0.0409%)	⬆️

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[D3Hunter]

rest lgtm

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, GMHDBJD

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Needs approval from an approver in each of these files:

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-07-03 07:59:31.230714984 +0000 UTC m=+1554623.953893963: ☑️ agreed by D3Hunter.
• 2025-07-03 10:56:57.205897895 +0000 UTC m=+1565269.929076876: ☑️ agreed by GMHDBJD.

[D3Hunter]

/retest

[tiprow]

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[tangenta]

/retest

[tiprow]

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