ThearchyHelios
68ea3a7f47
口径账本内核第一步:sql_semantics 加参数绑定与等价证明(bind_template / match_template)
为什么:口径账本要认出「这次执行的 SQL 是不是某一版口径的取数」。只比 normalize_sql 的文本会错给信任(status = 'paid'
和 'refunded' 文本相同),拿模板原文直接比 explain_sql_diff 又永远不等价(参数不同)。做法照 next-round 02 做法 1:
- 绑定只是启发:模板里的 {{ input.<字段> }}(可带 trim / compact)按位置换成哨兵,依次在 optimizer、light、parsed 三级
规范形式上抹掉字面量的值比结构,结构一样就按位置配字面量(半截字面量按正则取,写死的常量必须相等,同一槽位取同一个值);
三级都配不上时退回「同一列、同一运算符」的启发式配对(只给说明和预填)。
- 等价只由按绑定 render_template(运行时同一个渲染器)渲染出的口径 SQL 交给 explain_sql_diff 判;有槽位既没取到值又没有
缺省值时不证明(渲染出 EXISTS (SELECT FROM …) 这种口径实际不会执行的 SQL,sqlglot 照样能解析)。
- 不可比照实给原因:引用 vars. / nodes. / file_text、参数写在名字里、别的过滤器。
- 等价时按位置给列映射(外层别名不计、列先后计,SELECT * 按表结构展开)。
测试:新增 test_sql_binding.py(认得出、不错给信任、不可比、列映射);test_sql_equivalence.py 加「口径模板」一节,语料里
每一对把 B 的头两个字面量换成槽位当模板拿 A 比,判了等价的在虚构库上执行结果必须一致、explain_sql_diff 也必须判等价。
去掉「槽位没值不证明」那一道回跑,这一节抓到 11 对执行报错。
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