QLExpress3 历史问题修复 · alibaba/QLExpress#185

2022-03-18T02:57:25.000Z

QLExpress3 积攒了比较多的历史问题，这里列举额如下： - [x] 高精度计算溢出问题（除了这里列举的场景外还有很多有问题的场景，需要一一排查下） ```java String evalExpress = "a*2"; final ExpressRunner runner = new ExpressRunner(true, true); DefaultContext nameMap = new DefaultContext (); nameMap.put("a", new BigDecimal(Long.MAX_VALUE)); // 结果为 -2 Object obj = runner.execute(evalExpress, nameMap, null, false, true); ``` - [ ] 注释解析问题参考 #337

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help wanted

描述

QLExpress3 积攒了比较多的历史问题，这里列举额如下：

高精度计算溢出问题（除了这里列举的场景外还有很多有问题的场景，需要一一排查下）

String evalExpress = "a*2";

final ExpressRunner runner = new ExpressRunner(true, true);

DefaultContext<String, Object> nameMap = new DefaultContext<String, Object>();

nameMap.put("a", new BigDecimal(Long.MAX_VALUE));

// 结果为 -2
Object obj = runner.execute(evalExpress, nameMap, null, false, true);

注释解析问题

参考 #337

贡献者指南

技术栈: java
领域: backenddeveloper experienceperformance
议题类型: bug
难度: 3
预计时间: 1-2 days
活动状态: stale
清晰度: mostly clear
前置要求: JavaBigDecimalexpression parsing
新手友好度: 30
研究方向: Investigate the high precision calculation overflow in the arithmetic evaluation logic. The issue provides an example with BigDecimal multiplication overflow. Check file OperateData.java or similar classes handling numeric operations. Also examine issue #337 for the comment parsing bug, which may involve the lexer or parser. Propose fixes that handle overflow by checking for result overflow or using appropriate arithmetic.