refactor: optimize impalasql grammar#483
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| 指标 | 优化前 | 优化后 | 变化 |
|---|---|---|---|
| Grammar | 1242 行 | 1221 行 | -21 行（-1.7%） |
| 删除规则数 | — | — | 4 个 |
| 生成 Parser | — | — | 净减 292 行 |
| 测试 | 709 通过 | 721 通过 | 新增 12 个用例，0 失败 |
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