sql: introduce invisible index#3011
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Deardrops
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May 9, 2020
| - 不支持 `VISIBLE/INVISIBLE` 的索引 | ||
| - 其他类型的 Index Type (HASH/BTREE/RTREE) 只有语法支持，功能不支持 | ||
| + Add Column | ||
| - 不支持同时创建多个列 |
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This feature has implemented in TiDB, this line should be removed.
bb7133
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May 9, 2020
| ERROR 3522 (HY000): A primary key index cannot be invisible | ||
| ``` | ||
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| 这里的**主键**包括隐式的主键，隐式主键指的是当表中不存在显式的主键时，第一个 UNIQUE 索引（要求满足索引上的每一列都是 NOT NULL）会成为隐式的主键。 |
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please describe that implict PK doesnt exist in tidb actaully, but we treat it exists so that invisible index behaves the same with mysql
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@Deardrops Does this PR apply to v4.0? |
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@TomShawn This PR only apply to |
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AilinKid
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May 9, 2020
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@AilinKid Addressed, PTAL |
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@TomShawn this PR has LGT2, PTAL |
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@TomShawn PTAL |
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May 22, 2020
* sql: introduce invisible index * address comment * address comment * refine format Co-authored-by: Arenatlx <ailinsilence4@gmail.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
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I'll add this document in TOC after this week. |
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What is changed, added or deleted? (Required)
Now we implement new feature invisible index in TiDB, we introduce it in docs and update some docs related to it.
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
OptimizerUseInvisibleIndexesfromSmtmCtxtoSessionVarstidb#17040