refine modify column #21110
refine modify column #21110
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Signed-off-by: wjhuang2016 <[email protected]>
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| - `DECIMAL` 精度修改 | ||
| - 从 `VARCHAR(10)` 到 `VARCHAR(5)` 的长度压缩 | ||
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| 从 v8.5.4 版本起，TiDB 优化了部分 Reorg-Data 类型变更的执行效率。在 [SQL 模式](/sql-mode.md)非严格模式（即 `sql_mode` 值包含 `STRICT_TRANS_TABLES` 或 `STRICT_ALL_TABLES`），以下类型变更将不再进行数据重建（Meta-Only 变更）： |
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| 从 v8.5.4 版本起，TiDB 优化了部分 Reorg-Data 类型变更的执行效率。在 [SQL 模式](/sql-mode.md)非严格模式（即 `sql_mode` 值包含 `STRICT_TRANS_TABLES` 或 `STRICT_ALL_TABLES`），以下类型变更将不再进行数据重建（Meta-Only 变更）： | |
| 从 v8.5.4 版本起，TiDB 优化了部分 Reorg-Data 类型变更的执行效率。在 [SQL 模式](/sql-mode.md)严格模式（即 `sql_mode` 值包含 `STRICT_TRANS_TABLES` 或 `STRICT_ALL_TABLES`），以下类型变更将不再进行表数据重建，只进行部分索引的重建： |
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Please update v8.5.4 to v8.5.5 if it is planned in v8.5.5
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add the do-not-merge/hold label as the change in this PR won't be included in v8.5.4 |
| - 整数类型之间的变更（例如 `BIGINT` 到 `INT`） | ||
| - 字符串类型之间的变更（例如 `VARCHAR(200)` 到 `VARCHAR(100)`） | ||
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| 注意：VARCHAR 类型往 CHAR 类型变更时，要求所有的旧数据的尾部均不包含空格，否则需要进行 Reorg-Data。 |
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| 注意：VARCHAR 类型往 CHAR 类型变更时，要求所有的旧数据的尾部均不包含空格，否则需要进行 Reorg-Data。 | |
| > **注意：** | |
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| > 当 `VARCHAR` 转换为 `CHAR` 时，要求所有原数据的末尾均不包含空格；若不满足该条件，TiDB 仍会执行 Reorg-Data。 |
| - `DECIMAL` 精度修改 | ||
| - 从 `VARCHAR(10)` 到 `VARCHAR(5)` 的长度压缩 | ||
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| 从 v8.5.4 版本起，TiDB 优化了部分 Reorg-Data 类型变更的执行效率。在 [SQL 模式](/sql-mode.md)非严格模式（即 `sql_mode` 值包含 `STRICT_TRANS_TABLES` 或 `STRICT_ALL_TABLES`），以下类型变更将不再进行数据重建（Meta-Only 变更）： |
There was a problem hiding this comment.
Please update v8.5.4 to v8.5.5 if it is planned in v8.5.5
qiancai
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