alibaba/QLExpress

考虑允许拓展`ReflectLoader#loadField`?

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#415 opened on Dec 3, 2025

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 (1 comment) (0 reactions) (0 assignees)Java (4,457 stars) (1,113 forks)batch import
help wanted

Description

从解析到执行链看是 Parser -> GetFieldInstruction -> ReflectLoader#loadField 里进行任何对象属性取值，目前看实现是封闭的；

对于一些容器 Like，但非标准容器结构体，如：

  • MapLike、CollecttionLike
  • FlinkRow、SparkRow、Structed
  • JDBC ResultSet

如果想允许实现structObj.col_a.nested_col_b的取值，并不好进行直访拓展，需要额外进行一侧 convert copy，没有那么方便；

Contributor guide

Tech stack
java
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
JavaReflection
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Examine the current implementation of `ReflectLoader#loadField` in the QLExpress codebase, likely under `com.ql.util.express`. Understand why it is closed for extension and how container like objects are handled. Consider designing an extensibility mechanism such as an interface or plugin point. Review any existing comments or discussions in the issue for guidance on maintainer expectations.