executor: fix a bug in filterTemporaryTableKeys() function

[tiancaiamao]

What problem does this PR solve?

Problem Summary:

What is changed and how it works?

What's Changed:

A silly mistake in https://github.com/pingcap/tidb/pull/24737/files#diff-4c9a4c1e9a402d07a0a78f4db9f766d23f1ff57ceda1e75c4e83b579488ad301R1037

Should use [:0], but use [:]

How it Works:

Fix bug

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

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

Release note

• No release note

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• lysu

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[tiancaiamao]

/merge

[ti-chi-bot]

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

Details

Commit hash: 056c7d9

[ti-srebot]

cherry pick to release-5.1 in PR #25522