executor: ingore locks of temporary table for point_get/batch_point_get/select_lock

[lcwangchao]

executor: ingore locks of temporary table for point_get/batch_point_get/select_lock

What problem does this PR solve?

Problem Summary:

Because temporary tables only store records in memory and not share data with other session, so it is unnecessary to do locks. However, we just filtered temporary keys for insert/update/delete, just select for update will still write locks to tikv.

Moreover "select ... for update" still introduces some side effects to temporary table. For example, temporary table should not check schema version when committed. But if you just execute "select for update" in temporary table now, it will return an error when schema version changed.

What is changed and how it works?

Set lock vairable for PointGetExecutor#lock/PointGetExecutor#lock to false if it is a temporary table. And in SelectLockExec, filter out temporary table handles. After that not any locks will be written to tikv and can also avoid side effects introduced by locks (like schema version checking).

Check List

Tests

• Unit test

Side effects

• N/A

Release note

• No release note

[ti-srebot]

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• djshow832
• tiancaiamao

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[tiancaiamao]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c3078ac

[tiancaiamao]

B.T.W, we need to prevent DDL change on local temporary table, or at least forbid that when temporary table data not empty. @lcwangchao

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[lcwangchao]

B.T.W, we need to prevent DDL change on local temporary table, or at least forbid that when temporary table data not empty. @lcwangchao

This is a issue in todo list: #25888

[lcwangchao]

/run-unit-test