executor: add a test case for 'tidb_constraint_check_in_place' on temporary table

[tiancaiamao]

What problem does this PR solve?

Problem Summary:

tidb_constraint_check_in_place is a variable that controls the index uniqueness check.
If this variable is set to false, we will delay the check to 2PC commit. We presume the index key doesn't exist, adding those key to 2PC mutations and ask TiKV to verify that.

For the temporary table, we do not actually write to TiKV.
So I worried this variable would conflict with the temporary table feature.
It turned out that I'm wrong... the current code works well.
Anyway, I'd like to add a test to cover that.

What is changed and how it works?

What's Changed:

Add a test case

How it Works:

Check List

Tests

• Unit test
• No code

Release note

• No release note

[tiancaiamao]

/run-check_dev_2

[tiancaiamao]

/run-check_dev_2

[djshow832]

/lgtm

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[djshow832]

/lgtm

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This pull request has been approved by:

• djshow832
• lysu

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[lysu]

/merge

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

Commit hash: b251392

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