nontransactional dml FAQ about alias (#22523)#22539
nontransactional dml FAQ about alias (#22523)#22539ti-chi-bot[bot] merged 2 commits intopingcap:release-8.5from
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Co-authored-by: xixirangrang <hfxsd@hotmail.com>
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request enhances the TiDB documentation by addressing a common Highlights
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Code Review
This pull request adds documentation about a potential Unknown column error when using table aliases in non-transactional DML statements. The changes are clear and helpful. I've provided one suggestion to improve the clarity and conciseness of a note, in line with the repository's documentation style guide.
Note: Security Review has been skipped due to the limited scope of the PR.
| > **Note:** | ||
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| > The `BATCH` statement is internally rewritten and split into multiple DML statements during execution. In the current version, table aliases might not be preserved, which can result in errors such as `Unknown column '<alias>.<column>' in 'where clause'`. To avoid this issue, do not use table aliases. Before execution, use `DRY RUN QUERY` or `DRY RUN` to preview the split statements before execution. For more information, see [Non-Transactional DML Statements](/non-transactional-dml.md). |
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For better clarity and conciseness, I suggest rephrasing this note. The proposed change uses the second person ("you") as recommended by the style guide and improves the flow between the two recommendations.
| > **Note:** | |
| > | |
| > The `BATCH` statement is internally rewritten and split into multiple DML statements during execution. In the current version, table aliases might not be preserved, which can result in errors such as `Unknown column '<alias>.<column>' in 'where clause'`. To avoid this issue, do not use table aliases. Before execution, use `DRY RUN QUERY` or `DRY RUN` to preview the split statements before execution. For more information, see [Non-Transactional DML Statements](/non-transactional-dml.md). | |
| > **Note:** | |
| > | |
| > The `BATCH` statement is internally rewritten and split into multiple DML statements during execution. In the current version, table aliases might not be preserved, which can result in errors such as `Unknown column '<alias>.<column>' in 'where clause'`. To avoid this issue, do not use table aliases. You can also use `DRY RUN QUERY` or `DRY RUN` to preview the split statements before execution. For more information, see [Non-Transactional DML Statements](/non-transactional-dml.md). |
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/approve |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: Oreoxmt The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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This is an automated cherry-pick of #22523
First-time contributors' checklist
What is changed, added or deleted? (Required)
Added FAQ about
Unknown columnerror when using alias.Which TiDB version(s) do your changes apply to? (Required)
Tips for choosing the affected version(s):
By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.
For details, see tips for choosing the affected versions (in Chinese).
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?