ddl: Add test case about exchange partition across databases

[JaySon-Huang]

What problem does this PR solve?

Issue Number: ref #7296

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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

None

[JaySon-Huang]

/test all

[JaySon-Huang]

/test all

[JaySon-Huang]

/test all

[JaySon-Huang]

/test all

[JaySon-Huang]

/hold

fullstack-test2/ddl/partitions/alter_exchange_partition.test: Running
  File: fullstack-test2/ddl/partitions/alter_exchange_partition.test
  Error line: 233
  Error: set session tidb_isolation_read_engines='tiflash'; select * from test.e order by id;
  Result:
    ERROR 1105 (HY000) at line 1: other error for mpp stream: Code: 0, e.displayText() = DB::TiFlashException: The schema does not match the query, details: the column in the query is not found in current columns, keyspace=4294967295 table_id=822 column_id=4, e.what() = DB::TiFlashException,
  Expected:
    +-----+-------+-------+------+
    | id  | fname | lname | c1   |
    +-----+-------+-------+------+
    |   3 | a     | b     | NULL |
    | 108 | a     | b     | NULL |
    +-----+-------+-------+------+

[CalvinNeo]

lgtm

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CalvinNeo

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-30 05:39:52.411269296 +0000 UTC m=+335746.168404869: ☑️ agreed by CalvinNeo.

[ti-chi-bot]

@JaySon-Huang: 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
pull-integration-test	9d60a79	link	true	/test pull-integration-test

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[ti-chi-bot]

PR needs rebase.

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