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Cypher on SQL stores: a map holding a relationship compares by properties after UNWIND, a comprehension, a reduce, or against properties()

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难度
4/5
预计耗时
3-5 天
新手友好度
38/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
python, sql
领域
backend, databases

调研方向

Start by reading the implementation from port #186 and the spec step in “Maps and lists holding relationships compare by identity”; the issue gives no file or test paths. Trace how SQL stores preserve relationship identity through UNWIND, comprehensions, reductions, and properties() comparisons. Done means those map comparisons match Neo4j’s identity behavior and the spec no longer skips SQL stores.

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描述

Port of liberation-data/drivine4j#211.

A map holding a relationship compares by properties where the compiler has lost its identity: after UNWIND, a comprehension's or a reduce's variable, or against properties(r). RETURN {x: r1} = {x: properties(r2)} gives true, UNWIND [{x: r1}] AS m RETURN m = {x: r2} gives true; Neo4j gives false for both.

This follows the port of #186 (liberation-data/drivine-python#88), which brings the identity column and compared; until then every such comparison is by properties here. The spec's step in "Maps and lists holding relationships compare by identity" (liberation-data/drivine-cypher-spec#6) skips the SQL stores for it.

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Python
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