fix flags

[daviszhen]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #25122

What this PR does / why we need it:

• 计划阶段回溯源表列，保留主键、唯一键、非空和自增属性。
• ColDef 增加 unique protobuf 字段，并同步生成代码及深拷贝逻辑。
• 前端协议生成 NOT_NULL_FLAG、PRI_KEY_FLAG、UNIQUE_KEY_FLAG、AUTO_INCREMENT_FLAG。
• 增加计划元数据和协议数据包单元测试。
• 增加 BVT 用例，覆盖直接投影、派生表、计算列及 information_schema 约束元数据验证。

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[XuPeng-SH]

[P1] Preserve source metadata when result columns are reordered

resultColumnProjectionAtNode treats ref.ColPos as an index into the current ProjectList. For a valid query such as SELECT unique_value, id FROM t, the final project list contains source refs in output order [ColPos=1, ColPos=0]; indexing it by those source positions returns the opposite expressions and swaps PRI/UNI (and related) MySQL ColumnDefinition flags. The existing tests only use source order, so this remains untested.

Resolve the projection by the source ref identity (RelPos + ColPos, with safe name fallback) or maintain an explicit output-to-source mapping; do not use the source ColPos as the current ProjectList index. Add a reordered-output regression test.

Location: pkg/sql/plan/build.go (resultColumnProjectionAtNode).

[daviszhen]

[P1] Preserve source metadata when result columns are reordered

resultColumnProjectionAtNode treats ref.ColPos as an index into the current ProjectList. For a valid query such as SELECT unique_value, id FROM t, the final project list contains source refs in output order [ColPos=1, ColPos=0]; indexing it by those source positions returns the opposite expressions and swaps PRI/UNI (and related) MySQL ColumnDefinition flags. The existing tests only use source order, so this remains untested.

Resolve the projection by the source ref identity (RelPos + ColPos, with safe name fallback) or maintain an explicit output-to-source mapping; do not use the source ColPos as the current ProjectList index. Add a reordered-output regression test.

Location: pkg/sql/plan/build.go (resultColumnProjectionAtNode).

• 修复 resultColumnProjectionAtNode，不再把源列 ColPos 当作当前 ProjectList 下标。
• 改为按 RelPos + ColPos 查找源表达式，并增加安全的列名/表名回退匹配。
• 增加 SELECT unique_value, id 列顺序重排 UT，验证 PRIMARY KEY、UNIQUE、NOT NULL、AUTO_INCREMENT 元数据不会错位。
• 已通过 pkg/sql/plan 测试和 git diff --check。

[aunjgr]

Reviewed exact head 4781ed5 with all 26 checks terminal and passing. The previous JOIN blocker is closed: direct-column provenance follows JOIN projection and binding identity, chooses the correct child, and clears only nullability when an outer join null-extends that child. Reordered projections and planner-to-protocol flags are covered. No remaining merge-blocking correctness issue found.

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-08-10 17:43 UTC · Rule: main · triggered by rule Automatic queue on approval for main
• ❌ Checks failed · in-place
• 🚫 Left the queue — 2026-08-10 18:11 UTC · at 45a78907a7e00dc7546bbbcfdc9d703e8d4ffeb5

This pull request spent 27 minutes 50 seconds in the queue, with no time running CI.

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Reason

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Hint

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Requeued — the merge queue status continues in this comment ↓.

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-08-11 03:19 UTC · Rule: main · triggered by rule Automatic queue on approval for main
• ✅ Checks skipped · PR is already up-to-date
• ✅ Merged — 2026-08-11 03:20 UTC · at 21b3478452f22635f3c8cdca8bd22f9a666b22dd · squash

This pull request spent 40 seconds in the queue, including 3 seconds running CI.

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  • fix flags #26780
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