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Left join operator - broken?

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
48/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
冷清
技术栈
fsharp, postgresql, sqlite
领域
databases

调研方向

从链接的 PostgreSQL 单元测试开始,将其断言与现有的 left-join 测试进行比较,尤其要关注检查的是 join 的哪一侧。然后跟踪 provider 代码中对 (!!) 运算符和 UseOptionTypes=true 的处理;当左连接的实体及其列被标记为可选,并且回归测试通过时,即表示完成。

由索引模型根据 Issue 内容生成。

描述

enhancement

( ... Unless I've completely misunderstood how it's supposed to work? ... )

I tried to use a left join in a query and neither the left-joined entity nor its columns are marked as optional. This happens on Postgres, MSSQL, and SQLite, using UseOptionTypes=true.

I thought I mustbe doing something wrong since there was a unit test for left join, but then I noticed that that unit test is wrong: by calling fst it checks the None status of the column in the main table, rather than the left-joined one. The column in the main table happens to be nullable so the test passes.

I added a unit test for PostgreSQL and it does make the build fail.

Diving into the code didn't quite work. I found what I strongly suspect is a bug here, because the compiler treats (!!) as an arbitrary pattern match identifier rather than matching against the actual operator, but changing it to MethodWithName "op_BangBang" didn't fix the test.

I even went back and installed older versions of the library, but couldn't find one where (!!) worked as I expected.

主要语言
F#
星标
627
派生
147
平均合并
2 小时 2 分钟
30 天内合并 PR
1

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