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ThearchyHelios
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条件里套着的子查询（EXISTS、IN (SELECT …)）原来按外层的来源整个照抄进外层那个条件，别名原样留着：带别名和不带别名的同一条 NOT EXISTS 被报成两处筛选不同，双盲复算就会说盲算换了口径。现在每段 SELECT 在语法树上记段号（复制出来的子查询靠它找回原树上那一段算好的来源，相关子查询照样到外层找），改写时每一列按它所在那一段认，子查询里的表去掉别名；比较两边排序时也按那一段的来源排。HAVING 引用 SELECT 别名（HAVING s > 100）换成别名指的表达式，和 GROUP BY 别名一个读法，聚合函数里的同名列不换。 取哪几行原来只看最外层 LIMIT 的行数：CTE 里 LIMIT 10 和 LIMIT 100、OFFSET 0 和 OFFSET 10、取前 10 行时降序和升序都报成没有不同，取到的却是不同的行。Facets 加 limits，逐段收集（最外层、CTE、FROM 里的子查询；条件里的子查询已经整个写在条件里，不单算，免得报两遍）行数、跳过的行数，以及这一段的排序（ORDER BY 1、别名换成 SELECT 里的表达式）；OFFSET 0 算没写，排序只在限了行的段里比。原来的 limit（最外层行数）照旧保留。
1354 lines
68 KiB
Python
1354 lines
68 KiB
Python
"""SQL 语义：两条 SQL 算的是不是一回事，不是的话差在哪。
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双盲复算要回答「盲算和原流程的 SQL 差在哪」（A 按支付时间筛、B 按下单时间筛；A 排除了作废的行、B 没有），运行
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对比要回答「这一期和上一期的 SQL 是不是同一个模板」（定时运行每次的日期不同，不能算模板变了），反方审稿要看自己
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的查询和原查询的口径是否一致。三处共用这里：
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- normalize_sql：字面量换成占位符之后的规范文本，加上字面量本身（按规范文本里的顺序）。两条 SQL 只有字面量不同，
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规范文本就相同；关键字大小写、空白、注释、不加引号的名字的大小写都不算不同。
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- facets：把一条查询拆成几个方面——用到的表、连接（类型、关联进来的表、ON 条件）、WHERE 的各个合取式、其中的
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时间条件（列、运算符、取值）、分组、聚合（函数、参数、是否去重）、HAVING、取哪几行（LIMIT、OFFSET、取前几行
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时的排序）。别名一律换成真实表名（条件里套着的子查询也是），等式、比较的两边排好顺序：o.paid_at >= '2026-09-01'
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和 '2026-09-01' <= orders.paid_at 是同一个条件。
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- diff_facets：逐个方面比两份 facets，每处不同给一句中文说明。
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**逐段收集。** CTE、子查询里的条件、聚合和取行也算进来：盲算可能把有效记录条件写在 CTE 里，原流程写在外层，按
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「整条语句里有哪些条件」比才不会把同一个口径报成不同。逗号连接（以及 INNER JOIN 之外又写在 WHERE 里的等值关联）
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写在 WHERE 里的列等式算作关联条件，不算筛选。条件里套着的子查询（EXISTS、IN (SELECT …)）既单算一段，也按它自己
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那一段的来源整个写进外层那个条件：别名在子查询里定义，拿外层的来源去认，同一个条件只因别名不同就会被报成不同。
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**和 sqlcheck 一样宁可漏报。** 解析不了（语法错、方言特性、多条语句、不是查询）就带 parse_error 返回，从不抛
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异常。没加表前缀、又有好几张表可能有这一列的，照写列名（给了表结构才去对）。只读语法树，不执行 SQL。
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"""
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from __future__ import annotations
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import logging
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import re
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from collections.abc import Iterable, Iterator, Mapping
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from dataclasses import dataclass, fields, is_dataclass
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from itertools import zip_longest
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from typing import Any
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from app.data import catalog
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from app.data.names import name_key
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from app.data.sqlcheck import _bare_column, _conjuncts, _parents, _unparen, dialect_of
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logger = logging.getLogger(__name__)
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#: 规范文本里字面量的占位符
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PLACEHOLDER = "?"
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#: 太长的 SQL 不做语法分析（normalize_sql 退回逐词规范化，facets 带 parse_error）：解析耗时随长度增长
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MAX_SQL_CHARS = 100_000
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#: 每段 SELECT 在语法树上记段号的 meta 键。条件、表达式要复制一份再改写，复制出来的子查询靠段号找回原来那一段
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#: 算好的来源（别名、外层）：复制品没有父节点，自己找不到外层
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_SEGMENT = "sql_semantics_segment"
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# ==========================================================================
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# 解析
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# ==========================================================================
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def _read(dialect: str | None) -> str | None:
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"""数据源类型（sqlite / postgresql / mysql …）或 sqlglot 的方言名 → 解析用的方言。认不出的按 sqlglot 的通用读法。"""
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found = dialect_of(dialect)
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if found or not dialect:
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return found
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from sqlglot.dialects.dialect import Dialect
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name = dialect.strip().lower()
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try:
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Dialect.get_or_raise(name)
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except Exception: # noqa: BLE001 - 不认识的方言名：按通用读法
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return None
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return name
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def _parse_problem(error: Exception) -> str:
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"""sqlglot 的报错 → 一句给人看的话。原文是英文、还带终端的高亮控制符，只取出错的位置。"""
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errors = getattr(error, "errors", None) or []
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first = errors[0] if errors and isinstance(errors[0], dict) else {}
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line, col = first.get("line"), first.get("col")
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if isinstance(line, int) and isinstance(col, int):
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return f"SQL 无法解析（第 {line} 行第 {col} 列附近）"
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return "SQL 无法解析"
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def _parse(sql: Any, read: str | None) -> tuple[Any, str | None]:
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"""(语法树, None) 或 (None, 为什么分析不了)。只认单条查询。"""
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import sqlglot
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from sqlglot import exp
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if not isinstance(sql, str) or not sql.strip():
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return None, "SQL 为空"
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text = sql.strip()
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if len(text) > MAX_SQL_CHARS:
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return None, f"SQL 超过 {MAX_SQL_CHARS} 个字符，没有做语法分析"
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try:
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statements = [s for s in sqlglot.parse(text, read=read) if s is not None]
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except Exception as e: # noqa: BLE001 - 语法错、方言特性、sqlglot 不支持的写法
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return None, _parse_problem(e)
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if not statements:
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return None, "SQL 为空"
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if len(statements) > 1:
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return None, f"一次只能分析一条 SQL，这里有 {len(statements)} 条"
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if not isinstance(statements[0], exp.Query):
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return None, "不是查询语句（只分析 SELECT、WITH 开头的查询）"
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return statements[0], None
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# ==========================================================================
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# 规范化：字面量换成占位符
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# ==========================================================================
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@dataclass(frozen=True)
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class NormalizedSql:
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"""规范文本和字面量。text 相同就是同一个模板，literals 是这一次填进去的值（SQL 写法，字符串带引号）。
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parse_error 不为空时 text 是逐词规范化的结果（关键字转大写、不加引号的名字转小写、字面量换成占位符）：
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同一个模板只改了字面量的两条 SQL 照样得到同一个 text，只是空白、括号之外的写法差异认不出来。
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"""
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text: str
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literals: tuple[str, ...] = ()
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parse_error: str | None = None
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def same_shape(self, other: "NormalizedSql") -> bool:
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"""两条 SQL 是不是同一个模板（只有字面量不同也算）。"""
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return self.text == other.text
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def as_dict(self) -> dict[str, Any]:
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out: dict[str, Any] = {"text": self.text, "literals": list(self.literals)}
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if self.parse_error:
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out["parse_error"] = self.parse_error
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return out
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def _is_literal(token: Any) -> bool:
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"""字符串（含 N'…'、x'…'、$$…$$ 这些变体）和数字。"""
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name = token.token_type.name
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return name == "NUMBER" or name.endswith("STRING")
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def _tokens(text: str, read: str | None) -> list[Any]:
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from sqlglot.dialects.dialect import Dialect
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return list(Dialect.get_or_raise(read).tokenize(text))
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def normalize_sql(sql: str, dialect: str | None = None) -> NormalizedSql:
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"""字面量换成占位符后的规范文本 + 字面量。
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先按方言解析、重新生成一遍（去掉注释、统一关键字和空白、按方言的规则转换不加引号的名字的大小写），再把生成的
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文本切成词，字符串和数字换成「?」：字面量按规范文本里出现的顺序排，不受语法树里子句存放顺序的影响。解析
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不了就直接对原文逐词规范化，带上 parse_error。从不抛异常。
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"""
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read = _read(dialect)
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root, problem = _parse(sql, read)
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if root is not None:
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try:
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from sqlglot.optimizer.normalize_identifiers import normalize_identifiers
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canonical = normalize_identifiers(root.copy(), dialect=read).sql(dialect=read, comments=False)
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pieces: list[str] = []
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literals: list[str] = []
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pos = 0
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for token in _tokens(canonical, read):
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if _is_literal(token):
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pieces += [canonical[pos:token.start], PLACEHOLDER]
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literals.append(canonical[token.start:token.end + 1])
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pos = token.end + 1
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pieces.append(canonical[pos:])
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return NormalizedSql("".join(pieces), tuple(literals))
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except Exception: # noqa: BLE001 - 生成、切词出错：退回逐词规范化，照实标出
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logger.warning("SQL 规范化失败，退回逐词规范化", exc_info=True)
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problem = "SQL 的写法无法规范化"
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return _by_tokens(sql if isinstance(sql, str) else "", read, problem)
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def _by_tokens(text: str, read: str | None, problem: str | None) -> NormalizedSql:
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"""解析不了的 SQL 逐词规范化：关键字转大写，不加引号的名字按 name_key，带引号的名字原样，字面量换成占位符。"""
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try:
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tokens = _tokens(text, read)
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except Exception: # noqa: BLE001 - 引号、括号没配对：只能把空白压成一个
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return NormalizedSql(" ".join(text.split()), (), problem or "SQL 无法解析")
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words: list[str] = []
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literals: list[str] = []
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for token in tokens:
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raw = text[token.start:token.end + 1]
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if _is_literal(token):
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words.append(PLACEHOLDER)
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literals.append(raw)
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elif token.token_type.name == "VAR":
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words.append(name_key(token.text))
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elif token.token_type.name == "IDENTIFIER":
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words.append(raw)
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else:
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words.append(token.text.upper())
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return NormalizedSql(" ".join(words), tuple(literals), problem)
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# ==========================================================================
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# 各个方面
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# ==========================================================================
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#: 一列：(表, 列)。表是给人看的真实表名（CTE、子查询写它的名字），认不出是哪张表时为 None
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ColumnRef = tuple[str | None, str]
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@dataclass(frozen=True)
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class Part:
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"""一个条件、一个分组键、一个聚合参数……
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key 用来比较：别名换成真实表名，表名、列名按 name_key，等式和比较的两边排好顺序；loose 同 key 但不写表名，两边
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查的表换了一张（orders 换成 orders_archive）时拿它比其余各方面，免得同一个条件只因表名不同被报成不同。
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text 给人看：好几张表都有的列写「表.列」（真实表名，不是别名），其余只写列名；full 一律写表名，两边的 text
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一样、key 却不同时改用它说明。excludes 只在 WHERE 的「排除」写法上有：<>、NOT、NOT IN、IS NOT NULL 去掉
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否定之后排除的是什么（IS NOT NULL 写成「列 为空」）。
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"""
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key: str
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text: str
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columns: tuple[ColumnRef, ...] = ()
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excludes: str | None = None
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loose: str = ""
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full: str = ""
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@staticmethod
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def plain(key: str, text: str) -> "Part":
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"""没有列的一项（表名、COUNT(*) 的「*」）：四种写法相同。"""
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return Part(key=key, text=text, loose=key, full=text)
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@dataclass(frozen=True)
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class JoinFacet:
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"""一次连接。kind：inner / left / right / full / cross / semi / anti / natural。table 是关联进来的那一侧，other
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是另一侧：关联条件里出现的别的表（给人看的真实表名）；没有条件的（CROSS JOIN）是在它之前出现的各个来源。on 是
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关联条件的合取式排好序后用 AND 连起来的写法，没有条件是 None。"""
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kind: str
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table: Part
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on: Part | None = None
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other: tuple[str, ...] = ()
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@dataclass(frozen=True)
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class TimePredicate:
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"""WHERE 里的一个时间条件。op：= / <> / > / >= / < / <= / between / in。value 是另一侧给人看的写法：
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BETWEEN 是「低 AND 高」，IN 是「(…)」。"""
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column: Part
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op: str
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value: str
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condition: Part
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@dataclass(frozen=True)
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class Aggregate:
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"""一个聚合。func 是函数名的小写（sum / count / avg / min / max …）；arg 是参数，COUNT(*)、COUNT(1) 的 arg
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是「*」，去重聚合是 DISTINCT 里面的表达式；text 是整个聚合给人看的写法。窗口函数不算。"""
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func: str
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arg: Part
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distinct: bool
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text: str
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@dataclass(frozen=True)
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class LimitFacet:
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"""一段查询取哪几行。count、offset 是行数和跳过行数的写法（没写为 None，OFFSET 0 也算没写）；order 是这一段的
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排序键 (Part, 是否降序)：只取前几行时，按什么排决定了取到的是哪几行。scope 是哪一段：None 是最外层，CTE 写它的
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名字，FROM 里的子查询写它的别名（没有别名写「子查询」）。条件里套着的子查询不单算：它整个写在那个条件里比。"""
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count: str | None
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offset: str | None = None
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order: tuple[tuple[Part, bool], ...] = ()
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scope: str | None = None
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@dataclass(frozen=True)
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class Facets:
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"""一条查询的各个方面。每一项都按在 SQL 里出现的先后排、按 key 去重；parse_error 不为空时其余都是空的。
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limit 是最外层 LIMIT 的行数（写法）；limits 是各段取哪几行（最外层在前，见 LimitFacet），只有写了 LIMIT 或
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OFFSET 的段才有。
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"""
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dialect: str | None = None
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tables: tuple[Part, ...] = ()
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joins: tuple[JoinFacet, ...] = ()
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where: tuple[Part, ...] = ()
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time: tuple[TimePredicate, ...] = ()
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group_by: tuple[Part, ...] = ()
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aggregates: tuple[Aggregate, ...] = ()
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having: tuple[Part, ...] = ()
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limit: str | None = None
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limits: tuple[LimitFacet, ...] = ()
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parse_error: str | None = None
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|
||
def as_dict(self) -> dict[str, Any]:
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return _jsonable(self)
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|
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|
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def _jsonable(value: Any) -> Any:
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if is_dataclass(value) and not isinstance(value, type):
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return {f.name: _jsonable(getattr(value, f.name)) for f in fields(value)}
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if isinstance(value, (list, tuple)):
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return [_jsonable(v) for v in value]
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return value
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||
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def facets(sql: str, dialect: str | None = None, *, schema: Mapping[str, Any] | None = None) -> Facets:
|
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"""把一条查询拆成各个方面。从不抛异常：解析不了、或者分析时出了意外，返回带 parse_error 的 Facets。
|
||
|
||
schema 是数据源的 schema_cache 形状（{"tables": {表名: {"columns": [{"name": …}]}}}），可以不给。给了的话，
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几张表连在一起、列又没加表前缀时按它认列是哪张表的；不给就照写列名，比较时可能把同一列当成两列。
|
||
"""
|
||
read = _read(dialect)
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||
root, problem = _parse(sql, read)
|
||
if root is None:
|
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return Facets(dialect=read, parse_error=problem)
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||
try:
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||
return _Statement(root, read, schema).facets()
|
||
except Exception: # noqa: BLE001 - 分析本身的缺陷不能连累调用方：当作分析不了，记下来修
|
||
logger.warning("SQL 语义分析失败", exc_info=True)
|
||
return Facets(dialect=read, parse_error="SQL 的结构无法分析")
|
||
|
||
|
||
# ---- 语法树上的小工具
|
||
|
||
#: 比较：(运算符的写法, 两边对调之后的类型)
|
||
_COMPARE: dict[str, tuple[str, str]] = {"EQ": ("=", "EQ"), "NEQ": ("<>", "NEQ"), "GT": (">", "LT"),
|
||
"GTE": (">=", "LTE"), "LT": ("<", "GT"), "LTE": ("<=", "GTE")}
|
||
#: 连接类型的写法（diff_facets 里用）
|
||
_JOIN_WORDS = {"inner": "INNER JOIN", "left": "LEFT JOIN", "right": "RIGHT JOIN", "full": "FULL JOIN",
|
||
"cross": "CROSS JOIN", "semi": "SEMI JOIN", "anti": "ANTI JOIN", "natural": "NATURAL JOIN"}
|
||
#: 日期、时间函数（sqlglot 把各方言的写法归成这些类型：strftime、DATE_FORMAT 都是 TimeToStr）
|
||
_DATE_FUNCS = ("CurrentDate", "CurrentDatetime", "CurrentTimestamp", "CurrentTime", "Date", "Datetime", "DateAdd",
|
||
"DateSub", "DateDiff", "DateTrunc", "TimestampTrunc", "DatetimeTrunc", "TimeToStr", "StrToDate",
|
||
"StrToTime", "TsOrDsToDate", "TsOrDsToTimestamp", "TsOrDsAdd", "DateStrToDate", "TimeStrToTime",
|
||
"UnixToTime", "Interval", "Extract", "DateFromParts", "LastDay", "Year", "Month", "Day", "Week",
|
||
"Quarter", "DayOfWeek")
|
||
#: sqlglot 不认识、原样当普通函数的日期函数名
|
||
_DATE_NAMES = frozenset({"date", "datetime", "strftime", "julianday", "now", "today", "to_date", "to_char",
|
||
"date_format", "unixepoch", "curdate", "sysdate", "getdate"})
|
||
#: 像日期、时间的字符串：2026-09-01、2026-09、2026/9/1、2026-09-01 08:00:00
|
||
_DATE_TEXT = re.compile(r"^\s*\d{4}[-/]\d{1,2}(?:[-/]\d{1,2})?(?:[ T]\d{1,2}:\d{2}(?::\d{2}(?:\.\d+)?)?)?\s*$")
|
||
#: 中文列名里像日期、时间的写法（英文列名按 catalog.is_date_column）
|
||
_CN_TIME = re.compile(r"(?:日期|时间|时刻|年月|月份)$|^(?:年|月|日|周|日期|时间)$")
|
||
_PLAIN_NAME = re.compile(r"^[A-Za-z_][A-Za-z0-9_]*$")
|
||
|
||
|
||
def _nested(node: Any, stop: Any) -> bool:
|
||
"""node 在 stop 底下的某个子查询里（不属于 stop 这一段）。"""
|
||
from sqlglot import exp
|
||
|
||
return any(isinstance(p, (exp.Select, exp.Subquery)) for p in _parents(node, stop=stop))
|
||
|
||
|
||
def _own_columns(node: Any) -> list[Any]:
|
||
"""node 里属于这一段的列（不进嵌套的子查询），不含 t.*。"""
|
||
from sqlglot import exp
|
||
|
||
if node is None:
|
||
return []
|
||
found = [node] if isinstance(node, exp.Column) else \
|
||
[c for c in node.find_all(exp.Column) if not _nested(c, node)]
|
||
return [c for c in found if c.name and not c.is_star]
|
||
|
||
|
||
def _own_nodes(select: Any) -> Iterator[Any]:
|
||
"""一段 SELECT 自己的节点：不进 CTE、子查询（它们是别的段）。"""
|
||
from sqlglot import exp
|
||
|
||
stack = [select]
|
||
while stack:
|
||
node = stack.pop()
|
||
yield node
|
||
children = [c for c in node.iter_expressions()
|
||
if not isinstance(c, (exp.Select, exp.Subquery, exp.CTE, exp.With))]
|
||
stack.extend(reversed(children))
|
||
|
||
|
||
def _datey(node: Any) -> bool:
|
||
"""node 里有日期函数、转成日期的 CAST，或者像日期的字符串。"""
|
||
from sqlglot import exp
|
||
|
||
kinds = tuple(k for k in (getattr(exp, n, None) for n in _DATE_FUNCS) if isinstance(k, type))
|
||
for n in node.walk():
|
||
if isinstance(n, kinds):
|
||
return True
|
||
if isinstance(n, exp.Anonymous) and str(n.name).lower() in _DATE_NAMES:
|
||
return True
|
||
if isinstance(n, exp.Cast) and n.to is not None and any(w in n.to.this.name for w in ("DATE", "TIME")):
|
||
return True
|
||
if isinstance(n, exp.Literal) and n.is_string and _DATE_TEXT.match(str(n.this)):
|
||
return True
|
||
return False
|
||
|
||
|
||
def _temporal_name(name: str) -> bool:
|
||
"""列名像日期、时间：英文按 catalog.is_date_column 的命名规则（paid_at、order_date），中文看结尾（支付日期）。"""
|
||
return catalog.is_date_column(name, None) or bool(_CN_TIME.search(name))
|
||
|
||
|
||
def _join_kind(join: Any) -> str:
|
||
side = str(join.args.get("side") or "").lower()
|
||
kind = str(join.args.get("kind") or "").lower()
|
||
if side in ("left", "right", "full"):
|
||
return side
|
||
if join.args.get("method"):
|
||
return "natural"
|
||
if kind in ("semi", "anti"):
|
||
return kind
|
||
if kind == "cross" or not (join.args.get("on") is not None or join.args.get("using")):
|
||
return "cross"
|
||
return "inner"
|
||
|
||
|
||
def _dedupe(items: Iterable[Any], key: Any) -> tuple[Any, ...]:
|
||
seen: dict[Any, Any] = {}
|
||
for item in items:
|
||
seen.setdefault(key(item), item)
|
||
return tuple(seen.values())
|
||
|
||
|
||
class _Sources(dict):
|
||
"""一段 SELECT 的来源 {别名的 name_key: _Source}。outer 是外层那段的来源：相关子查询里引用外层的别名（o.id）
|
||
从这里找。"""
|
||
|
||
outer: "_Sources | None" = None
|
||
|
||
|
||
@dataclass
|
||
class _Source:
|
||
"""一段 SELECT 的一个来源。kind：table（实表）/ derived（CTE、子查询）/ other（表函数、认不出的别名）。"""
|
||
|
||
kind: str
|
||
name: str # 给人看：表名（有库名就带上）、CTE 名、子查询别名
|
||
key: str # 比较用：name_key
|
||
idents: tuple[Any, ...] = () # 表名各段的 Identifier：给人看的写法照原样写回去
|
||
query: Any = None # derived：里面那段查询
|
||
|
||
|
||
class _Statement:
|
||
"""一条语句的分析：CTE、实表、每段 SELECT 的来源，以及把表达式写成 key / text 的规则。"""
|
||
|
||
def __init__(self, root: Any, read: str | None, schema: Mapping[str, Any] | None) -> None:
|
||
from sqlglot import exp
|
||
|
||
self.root = root
|
||
self.read = read
|
||
#: 各段 SELECT（原树上的节点），下标就是记在 meta 里的段号
|
||
self.segments: list[Any] = []
|
||
for select in root.find_all(exp.Select, bfs=False):
|
||
select.meta[_SEGMENT] = len(self.segments)
|
||
self.segments.append(select)
|
||
self.ctes: dict[str, Any] = {}
|
||
for cte in root.find_all(exp.CTE):
|
||
if cte.alias:
|
||
self.ctes.setdefault(name_key(cte.alias), cte.this)
|
||
tables: dict[str, _Source] = {}
|
||
for table in root.find_all(exp.Table, bfs=False):
|
||
if isinstance(table.this, exp.Identifier) and table.name and not self._is_cte(table):
|
||
source = self._table(table)
|
||
tables.setdefault(source.key, source)
|
||
self.tables = list(tables.values())
|
||
#: 整条语句只用到一张实表：给人看的写法一律不写表名
|
||
self.single = len(self.tables) <= 1
|
||
self.columns: dict[str, set[str]] = {}
|
||
for name, meta in ((schema or {}).get("tables") or {}).items():
|
||
if isinstance(meta, Mapping):
|
||
self.columns[name_key(str(name))] = {name_key(str(c.get("name"))) for c in meta.get("columns") or []
|
||
if isinstance(c, Mapping) and c.get("name")}
|
||
self._memo: dict[int, _Sources] = {}
|
||
self._shared: set[str] | None = None
|
||
|
||
# ---- 来源
|
||
|
||
def _is_cte(self, table: Any) -> bool:
|
||
return not table.text("db") and not table.text("catalog") and name_key(table.name) in self.ctes
|
||
|
||
@staticmethod
|
||
def _table(table: Any) -> _Source:
|
||
from sqlglot import exp
|
||
|
||
idents = tuple(i for i in (table.args.get("catalog"), table.args.get("db"), table.this)
|
||
if isinstance(i, exp.Identifier))
|
||
return _Source("table", ".".join(i.name for i in idents), ".".join(name_key(i.name) for i in idents),
|
||
tuple(i.copy() for i in idents))
|
||
|
||
def sources(self, select: Any) -> _Sources:
|
||
"""{别名的 name_key: 来源}。没有别名的实表按表名；认不出的来源按位置编号。"""
|
||
from sqlglot import exp
|
||
|
||
if id(select) in self._memo:
|
||
return self._memo[id(select)]
|
||
items = ([select.args["from_"].this] if select.args.get("from_") is not None else []) + \
|
||
[j.this for j in select.args.get("joins") or []]
|
||
out = _Sources()
|
||
for i, node in enumerate(items):
|
||
alias = node.alias_or_name if isinstance(node, (exp.Table, exp.Subquery)) else ""
|
||
slot = name_key(alias) if alias else f"#{i}"
|
||
if isinstance(node, exp.Table) and isinstance(node.this, exp.Identifier) and node.name:
|
||
if self._is_cte(node):
|
||
out[slot] = _Source("derived", node.name, name_key(node.name), (node.this.copy(),),
|
||
self.ctes[name_key(node.name)])
|
||
else:
|
||
out[slot] = self._table(node)
|
||
elif isinstance(node, exp.Subquery):
|
||
out[slot] = _Source("derived", alias or "子查询", slot, (exp.to_identifier(alias),) if alias else (),
|
||
node.this)
|
||
else:
|
||
out[slot] = _Source("other", alias, slot)
|
||
self._memo[id(select)] = out
|
||
parent = select.parent
|
||
while parent is not None and not isinstance(parent, exp.Select):
|
||
parent = parent.parent
|
||
out.outer = self.sources(parent) if parent is not None else None
|
||
return out
|
||
|
||
def _exposes(self, source: _Source, column: str) -> bool:
|
||
"""这个来源可能有这一列：实表看表结构（没给表结构就当可能有），CTE、子查询看它选出来的列。"""
|
||
from sqlglot import exp
|
||
|
||
if source.kind == "table":
|
||
return source.key not in self.columns or name_key(column) in self.columns[source.key]
|
||
if source.kind == "derived" and isinstance(source.query, exp.Select):
|
||
return any(isinstance(s, exp.Star) or (isinstance(s, exp.Column) and s.is_star)
|
||
or name_key(s.alias_or_name) == name_key(column) for s in source.query.selects)
|
||
return True
|
||
|
||
def locate(self, column: Any, sources: dict[str, _Source]) -> tuple[str | None, _Source | None]:
|
||
"""列 → (来源的别名键, 来源)。别名在这一段找不到的，到外层找（相关子查询引用外层），再找不到按「别的来源」
|
||
照写（别名写错了）；没加前缀、又有不止一个来源可能有它的，返回 (None, None)。"""
|
||
qualifier = column.table
|
||
if qualifier:
|
||
slot = name_key(qualifier)
|
||
if slot in sources:
|
||
return slot, sources[slot]
|
||
outer = getattr(sources, "outer", None)
|
||
while outer is not None:
|
||
if slot in outer:
|
||
return None, outer[slot] # 外层的来源：不算这一段的关联
|
||
outer = outer.outer
|
||
return None, _Source("other", qualifier, slot, (column.args["table"].copy(),))
|
||
hits = [(slot, s) for slot, s in sources.items() if self._exposes(s, column.name)]
|
||
return hits[0] if len(hits) == 1 else (None, None)
|
||
|
||
def through(self, source: _Source | None, column: str, depth: int = 0) -> tuple[_Source | None, str]:
|
||
"""CTE、子查询只是把一张表的列原样透出来（SELECT *，或者直接选出这一列）时，换成那张表的列：
|
||
原流程直接查 orders、盲算先在 CTE 里筛一遍再查，算的是同一列。"""
|
||
from sqlglot import exp
|
||
|
||
if source is None or source.kind != "derived" or depth > 3 or not isinstance(source.query, exp.Select):
|
||
return source, column
|
||
inner = self.sources(source.query)
|
||
if len(inner) != 1:
|
||
return source, column
|
||
only = next(iter(inner.values()))
|
||
for item in source.query.selects:
|
||
if isinstance(item, exp.Star) or (isinstance(item, exp.Column) and item.is_star):
|
||
return self.through(only, column, depth + 1)
|
||
target = _unparen(item.this if isinstance(item, exp.Alias) else item)
|
||
if name_key(item.alias_or_name) == name_key(column) and isinstance(target, exp.Column):
|
||
return self.through(only, target.name, depth + 1)
|
||
return source, column
|
||
|
||
def resolve(self, column: Any, sources: dict[str, _Source]) -> tuple[_Source | None, str]:
|
||
return self.through(self.locate(column, sources)[1], column.name)
|
||
|
||
def shared(self) -> set[str]:
|
||
"""好几张表都有的列名（name_key）：这条语句里出现时挂在不止一张表上（orders.order_id、refunds.order_id），
|
||
或者表结构里不止一张用到的表有它。给人看时只有这些列写表名，其余只写列名，读起来和原 SQL 一样短。"""
|
||
from sqlglot import exp
|
||
|
||
if self._shared is None:
|
||
owners: dict[str, set[str]] = {}
|
||
for select in self.root.find_all(exp.Select, bfs=False):
|
||
sources = self.sources(select)
|
||
for node in _own_nodes(select):
|
||
if isinstance(node, exp.Column) and node.name and not node.is_star:
|
||
source, name = self.resolve(node, sources)
|
||
if source is not None:
|
||
owners.setdefault(name_key(name), set()).add(source.key)
|
||
used = [t.key for t in self.tables]
|
||
self._shared = {name for name, keys in owners.items()
|
||
if len(keys) > 1 or sum(1 for t in used if name in self.columns.get(t, ())) > 1}
|
||
return self._shared
|
||
|
||
# ---- 写成 key / text
|
||
|
||
@staticmethod
|
||
def _owner(node: Any) -> Any:
|
||
"""node 往上最近的一段 SELECT（带段号的，node 本身是也算）；没有就是 None：node 在调用方那一段里。"""
|
||
from sqlglot import exp
|
||
|
||
while node is not None:
|
||
if isinstance(node, exp.Select) and node.meta.get(_SEGMENT) is not None:
|
||
return node
|
||
node = node.parent
|
||
return None
|
||
|
||
def scope(self, node: Any, default: dict[str, _Source]) -> dict[str, _Source]:
|
||
"""node 所在那一段的来源。条件里套着的子查询（EXISTS、IN (SELECT …)）是另一段：别名在那一段里定义，相关
|
||
子查询还要到外层找。复制出来的子查询带着段号，按段号找回原树上那一段算好的来源；不在子查询里就是 default。"""
|
||
owner = self._owner(node)
|
||
return default if owner is None else self.sources(self.segments[owner.meta[_SEGMENT]])
|
||
|
||
def render(self, node: Any, sources: dict[str, _Source], mode: str = "text") -> str:
|
||
"""四种写法（见 Part）：key、loose 比较用，名字按 name_key，key 写真实表名、loose 不写；text、full 给人看，
|
||
text 只在好几张表都有这一列时写真实表名，full 一律写（关联条件说的就是两张表各出哪一列，用 full）。
|
||
|
||
node 里套着的子查询逐段改写：每一列按它所在那一段的来源认，子查询里的表去掉别名（列已经写成了真实表名）。
|
||
子查询里拿两张表的列互相比的（相关子查询），给人看时和关联条件一样写表名。
|
||
"""
|
||
from sqlglot import exp
|
||
|
||
copy = node.copy()
|
||
groups: dict[int, tuple[Any, list[Any]]] = {}
|
||
for col in copy.find_all(exp.Column):
|
||
if col.name and not col.is_star:
|
||
owner = self._owner(col)
|
||
groups.setdefault(id(owner), (owner, []))[1].append(col)
|
||
for owner, cols in groups.values():
|
||
scope = sources if owner is None else self.sources(self.segments[owner.meta[_SEGMENT]])
|
||
found = [(col, *self.resolve(col, scope)) for col in cols]
|
||
here = mode
|
||
if owner is not None and mode == "text" and len({s.key for _, s, _ in found if s is not None}) > 1:
|
||
here = "full"
|
||
for col, source, name in found:
|
||
self._write(col, source, name, here)
|
||
for table in copy.find_all(exp.Table):
|
||
if isinstance(table.this, exp.Identifier) and self._owner(table) is not None:
|
||
table.set("alias", None)
|
||
if mode in ("key", "loose"):
|
||
for arg in ("catalog", "db", "this"):
|
||
ident = table.args.get(arg)
|
||
if isinstance(ident, exp.Identifier):
|
||
table.set(arg, exp.to_identifier(name_key(ident.name)))
|
||
return copy.sql(dialect=self.read, comments=False)
|
||
|
||
def _write(self, col: Any, source: _Source | None, name: str, mode: str) -> None:
|
||
"""按 render 的写法改写一列（就地改）。"""
|
||
from sqlglot import exp
|
||
|
||
quoted = isinstance(col.this, exp.Identifier) and bool(col.this.args.get("quoted"))
|
||
if mode in ("key", "loose"):
|
||
col.set("this", exp.to_identifier(name_key(name)))
|
||
col.set("table", exp.to_identifier(source.key) if source is not None and mode == "key" else None)
|
||
col.set("db", None)
|
||
col.set("catalog", None)
|
||
return
|
||
col.set("this", exp.Identifier(this=name, quoted=quoted or not _PLAIN_NAME.match(name)))
|
||
if source is None or (source.kind != "other" and mode != "full"
|
||
and (self.single or name_key(name) not in self.shared())):
|
||
col.set("table", None)
|
||
col.set("db", None)
|
||
col.set("catalog", None)
|
||
else:
|
||
*heads, last = source.idents or (exp.to_identifier(source.name),)
|
||
col.set("table", last.copy())
|
||
col.set("db", heads[-1].copy() if heads else None)
|
||
col.set("catalog", heads[-2].copy() if len(heads) > 1 else None)
|
||
|
||
def canonical(self, node: Any, sources: dict[str, _Source]) -> Any:
|
||
"""比较的两边排好顺序（列在左、字面量在右；两边都有列的按 key 排），IN 的取值排好序。返回新的树。
|
||
套着的子查询里的比较按它那一段的来源排：拿外层的来源去认子查询的别名，排出来的先后就取决于别名怎么起。"""
|
||
from sqlglot import exp
|
||
|
||
def fix(n: Any) -> Any:
|
||
found = _COMPARE.get(type(n).__name__)
|
||
if found is not None and isinstance(n, exp.Binary):
|
||
left, right = n.this, n.expression
|
||
lc, rc = bool(_own_columns(left)), bool(_own_columns(right))
|
||
here = self.scope(n, sources) if lc and rc else sources
|
||
if (rc and not lc) or (lc and rc and self.render(left, here, "key") > self.render(right, here, "key")):
|
||
return getattr(exp, found[1])(this=right, expression=left)
|
||
elif isinstance(n, exp.In) and n.expressions and not n.args.get("query") \
|
||
and not any(_own_columns(e) for e in n.expressions):
|
||
n.set("expressions", sorted(n.expressions, key=lambda e: e.sql(dialect=self.read)))
|
||
return n
|
||
|
||
return node.transform(fix)
|
||
|
||
def part(self, node: Any, sources: dict[str, _Source], *, excludes: bool = False) -> Part:
|
||
refs: dict[tuple[str | None, str], None] = {}
|
||
for col in _own_columns(node):
|
||
source, name = self.resolve(col, sources)
|
||
refs.setdefault((source.name if source is not None else None, name))
|
||
full = self.render(node, sources, "full")
|
||
# 拿两张表的列互相比的（相关子查询里的 o.id = r.order_id）和关联条件一样，给人看也写表名
|
||
across = len({table for table, _ in refs}) > 1
|
||
return Part(key=self.render(node, sources, "key"), text=full if across else self.render(node, sources),
|
||
columns=tuple(refs), excludes=self._excludes(node, sources) if excludes else None,
|
||
loose=self.render(node, sources, "loose"), full=full)
|
||
|
||
def _excludes(self, node: Any, sources: dict[str, _Source]) -> str | None:
|
||
"""排除写法去掉否定之后排除的是什么：a <> 1 → a = 1；NOT IN、NOT LIKE、NOT BETWEEN 同理；IS NOT NULL → 「a 为空」。
|
||
各方言把否定放的位置不一样（NOT 包一层，或者节点上带 negate），两种都认。"""
|
||
from sqlglot import exp
|
||
|
||
n = _unparen(node)
|
||
if isinstance(n, exp.NEQ):
|
||
return self.render(exp.EQ(this=n.this.copy(), expression=n.expression.copy()), sources)
|
||
inner = None
|
||
if isinstance(n, exp.Not):
|
||
inner = _unparen(n.this).copy()
|
||
elif n.args.get("negate"):
|
||
inner = n.copy()
|
||
inner.set("negate", None)
|
||
if inner is None:
|
||
return None
|
||
if isinstance(inner, exp.Is) and isinstance(_unparen(inner.expression), exp.Null):
|
||
return f"{self.render(inner.this, sources)} 为空"
|
||
return self.render(inner, sources)
|
||
|
||
# ---- 各个方面
|
||
|
||
def facets(self) -> Facets:
|
||
from sqlglot import exp
|
||
|
||
joins: list[JoinFacet] = []
|
||
where: list[Part] = []
|
||
time: list[TimePredicate] = []
|
||
group: list[Part] = []
|
||
aggregates: list[Aggregate] = []
|
||
having: list[Part] = []
|
||
for select in self.root.find_all(exp.Select, bfs=False):
|
||
sources = self.sources(select)
|
||
drafts = self._join_drafts(select, sources)
|
||
clause = select.args.get("where")
|
||
for cond in _conjuncts(clause.this) if clause is not None else []:
|
||
canon = self.canonical(cond, sources)
|
||
if self._joins_on_where(canon, sources, drafts):
|
||
continue
|
||
where.append(self.part(canon, sources, excludes=True))
|
||
if found := self._time(canon, sources):
|
||
time.append(found)
|
||
joins += [self._join(d, sources) for d in drafts]
|
||
group += self._group(select, sources)
|
||
aggregates += self._aggregates(select, sources)
|
||
having += self._having(select, sources)
|
||
return Facets(
|
||
dialect=self.read,
|
||
tables=tuple(Part.plain(s.key, s.name) for s in self.tables),
|
||
joins=_dedupe(joins, lambda j: (j.kind, j.table.key, j.on.key if j.on else None)),
|
||
where=_dedupe(where, lambda p: p.key),
|
||
time=_dedupe(time, lambda t: t.condition.key),
|
||
group_by=_dedupe(group, lambda p: p.key),
|
||
aggregates=_dedupe(aggregates, lambda a: (a.func, a.arg.key, a.distinct)),
|
||
having=_dedupe(having, lambda p: p.key),
|
||
limit=self._limit(),
|
||
limits=tuple(self._limits()),
|
||
)
|
||
|
||
def _join_drafts(self, select: Any, sources: dict[str, _Source]) -> list[dict[str, Any]]:
|
||
from sqlglot import exp
|
||
|
||
first = select.args.get("from_")
|
||
first_alias = first.this.alias_or_name if first is not None and \
|
||
isinstance(first.this, (exp.Table, exp.Subquery)) else ""
|
||
drafts: list[dict[str, Any]] = []
|
||
for i, join in enumerate(select.args.get("joins") or []):
|
||
target = join.this
|
||
alias = target.alias_or_name if isinstance(target, (exp.Table, exp.Subquery)) else ""
|
||
slot = name_key(alias) if alias else f"#{i + 1}"
|
||
conds: list[Any] = []
|
||
if join.args.get("on") is not None:
|
||
conds = [self.canonical(c, sources) for c in _conjuncts(join.args["on"])]
|
||
elif join.args.get("using") and first_alias and alias:
|
||
# USING (id)：按「FROM 的那张表.id = 这张表.id」写，和 ON 的写法放在一起比
|
||
conds = [self.canonical(exp.EQ(this=exp.column(ident.name, table=first_alias),
|
||
expression=exp.column(ident.name, table=alias)), sources)
|
||
for ident in join.args["using"]]
|
||
drafts.append({"kind": _join_kind(join), "slot": slot, "source": sources.get(slot), "conds": conds,
|
||
"before": [s.name for key, s in list(sources.items())[:i + 1] if key != slot]})
|
||
return drafts
|
||
|
||
def _joins_on_where(self, cond: Any, sources: dict[str, _Source], drafts: list[dict[str, Any]]) -> bool:
|
||
"""WHERE 里两张表的列等式（逗号连接、或者 INNER JOIN 之外又写的等值关联）并进那次连接的条件，不算筛选。
|
||
LEFT JOIN 这类外连接不并：写在 WHERE 里会把外连接变成内连接，和写在 ON 里不是一回事。"""
|
||
from sqlglot import exp
|
||
|
||
n = _unparen(cond)
|
||
if not isinstance(n, exp.EQ):
|
||
return False
|
||
left, right = _unparen(n.this), _unparen(n.expression)
|
||
if not (isinstance(left, exp.Column) and isinstance(right, exp.Column)):
|
||
return False
|
||
a, b = self.locate(left, sources)[0], self.locate(right, sources)[0]
|
||
if a is None or b is None or a == b:
|
||
return False
|
||
for draft in reversed(drafts):
|
||
if draft["slot"] in (a, b) and draft["kind"] in ("inner", "cross"):
|
||
draft["conds"].append(cond)
|
||
draft["kind"] = "inner"
|
||
return True
|
||
return False
|
||
|
||
def _join(self, draft: dict[str, Any], sources: dict[str, _Source]) -> JoinFacet:
|
||
source = draft["source"]
|
||
table = Part.plain(source.key, source.name) if source is not None else Part.plain("?", "?")
|
||
triples = sorted((self.render(c, sources, "key"), self.render(c, sources, "loose"),
|
||
self.render(c, sources, "full")) for c in draft["conds"])
|
||
on = Part(key=" AND ".join(t[0] for t in triples), text=" AND ".join(t[2] for t in triples),
|
||
loose=" AND ".join(sorted(t[1] for t in triples)), full=" AND ".join(t[2] for t in triples)) \
|
||
if triples else None
|
||
mentioned = {table for c in draft["conds"] for table, _ in self.part(c, sources).columns}
|
||
other = [name for name in dict.fromkeys(t for t in mentioned if t) if name != table.text] if draft["conds"] \
|
||
else draft["before"]
|
||
return JoinFacet(kind=draft["kind"], table=table, on=on, other=tuple(sorted(other)))
|
||
|
||
def _time(self, cond: Any, sources: dict[str, _Source]) -> TimePredicate | None:
|
||
"""时间条件：一边恰好一列（可以套着日期函数、CAST），另一边没有列；列名像日期，或者用了日期函数、像日期的字符串。"""
|
||
from sqlglot import exp
|
||
|
||
n = _unparen(cond)
|
||
if n.args.get("negate"):
|
||
return None
|
||
if isinstance(n, exp.Between):
|
||
subject, values, op = n.this, [n.args.get("low"), n.args.get("high")], "between"
|
||
elif isinstance(n, exp.In) and n.expressions and not n.args.get("query"):
|
||
subject, values, op = n.this, list(n.expressions), "in"
|
||
elif type(n).__name__ in _COMPARE and isinstance(n, exp.Binary):
|
||
subject, values, op = n.this, [n.expression], _COMPARE[type(n).__name__][0]
|
||
else:
|
||
return None
|
||
if subject is None or any(v is None or _own_columns(v) for v in values):
|
||
return None
|
||
column = _bare_column(subject)
|
||
cols = [column] if column is not None else _own_columns(subject)
|
||
if len(cols) != 1 or any(isinstance(x, (exp.AggFunc, exp.Select)) for x in subject.walk()):
|
||
return None
|
||
if not (_temporal_name(cols[0].name) or _datey(subject) or any(_datey(v) for v in values)):
|
||
return None
|
||
shown = [self.render(v, sources) for v in values]
|
||
value = f"{shown[0]} AND {shown[1]}" if op == "between" else f"({', '.join(shown)})" if op == "in" \
|
||
else shown[0]
|
||
return TimePredicate(column=self.part(cols[0], sources), op=op, value=value,
|
||
condition=self.part(cond, sources, excludes=True))
|
||
|
||
@staticmethod
|
||
def _aliases(query: Any) -> dict[str, Any]:
|
||
"""SELECT 里的别名 {name_key: 别名指的表达式}。"""
|
||
from sqlglot import exp
|
||
|
||
return {name_key(s.alias): s.this for s in query.selects if isinstance(s, exp.Alias) and s.alias}
|
||
|
||
@staticmethod
|
||
def _target(item: Any, selects: list[Any], aliases: dict[str, Any]) -> Any:
|
||
"""GROUP BY、ORDER BY 里的一项：写序号（1）的换成 SELECT 里对应的表达式，写别名的换成别名指的表达式
|
||
（MySQL、SQLite 的读法），其余原样。"""
|
||
from sqlglot import exp
|
||
|
||
target = _unparen(item)
|
||
if isinstance(target, exp.Literal) and not target.is_string and str(target.this).isdigit():
|
||
index = int(target.this) - 1
|
||
if 0 <= index < len(selects):
|
||
return selects[index].this if isinstance(selects[index], exp.Alias) else selects[index]
|
||
elif isinstance(target, exp.Column) and not target.table and name_key(target.name) in aliases:
|
||
return aliases[name_key(target.name)]
|
||
return target
|
||
|
||
def _group(self, select: Any, sources: dict[str, _Source]) -> list[Part]:
|
||
"""分组键。GROUP BY 1 换成 SELECT 里对应的表达式，GROUP BY 别名换成别名指的表达式（MySQL、SQLite 的读法）。"""
|
||
group = select.args.get("group")
|
||
if group is None:
|
||
return []
|
||
selects, aliases = select.selects, self._aliases(select)
|
||
return [self.part(self.canonical(self._target(item, selects, aliases), sources), sources)
|
||
for item in group.expressions]
|
||
|
||
def _having(self, select: Any, sources: dict[str, _Source]) -> list[Part]:
|
||
"""HAVING 的各个合取式。引用 SELECT 别名的列（HAVING s > 100，MySQL、SQLite 的写法）换成别名指的表达式，
|
||
和 GROUP BY 别名一个读法：不换的话，写别名和写表达式的同一个条件会被报成两个不同的条件。"""
|
||
from sqlglot import exp
|
||
|
||
clause = select.args.get("having")
|
||
if clause is None:
|
||
return []
|
||
aliases = self._aliases(select)
|
||
out = []
|
||
for cond in _conjuncts(clause.this):
|
||
copy = cond.copy()
|
||
for col in _own_columns(copy):
|
||
target = aliases.get(name_key(col.name)) if not col.table else None
|
||
# 聚合函数里的名字指的是表里的列，不是别名：SUM(amount) AS amount 之后的 SUM(amount) 不能再换
|
||
if target is None or any(isinstance(p, exp.AggFunc) for p in _parents(col, stop=None)):
|
||
continue
|
||
if col is copy:
|
||
copy = target.copy()
|
||
break
|
||
col.replace(target.copy())
|
||
out.append(self.part(self.canonical(copy, sources), sources))
|
||
return out
|
||
|
||
def _aggregates(self, select: Any, sources: dict[str, _Source]) -> list[Aggregate]:
|
||
from sqlglot import exp
|
||
|
||
out = []
|
||
for node in _own_nodes(select):
|
||
if not isinstance(node, exp.AggFunc) or isinstance(node.parent, exp.Window):
|
||
continue
|
||
try:
|
||
func = str(node.sql_name()).lower()
|
||
except Exception: # noqa: BLE001 - 没有固定函数名的聚合：按类型名
|
||
func = node.key
|
||
arg = node.this
|
||
distinct = isinstance(arg, exp.Distinct)
|
||
if distinct:
|
||
items = list(arg.expressions)
|
||
arg = items[0] if len(items) == 1 else exp.Tuple(expressions=[i.copy() for i in items])
|
||
if arg is None or isinstance(arg, exp.Star) or \
|
||
(func == "count" and not distinct and isinstance(_unparen(arg), exp.Literal)):
|
||
part = Part.plain("*", "*") # COUNT(*)、COUNT(1)：数的是行数
|
||
else:
|
||
part = self.part(self.canonical(arg, sources), sources)
|
||
out.append(Aggregate(func=func, arg=part, distinct=distinct, text=self.render(node, sources)))
|
||
return out
|
||
|
||
def _limit(self) -> str | None:
|
||
from sqlglot import exp
|
||
|
||
node = self.root.args.get("limit")
|
||
if node is None:
|
||
return None
|
||
value = node.expression if isinstance(node, exp.Limit) else node.args.get("count")
|
||
return value.sql(dialect=self.read, comments=False) if value is not None else None
|
||
|
||
def _limits(self) -> list[LimitFacet]:
|
||
"""各段取哪几行：最外层在前，其余按出现的先后。条件里套着的子查询（WHERE、HAVING、ON 里的）不单算：
|
||
它整个写在那个条件的 key 里，单算的话同一处不同会报两遍。"""
|
||
from sqlglot import exp
|
||
|
||
out = []
|
||
for query in self.root.find_all(exp.Select, exp.SetOperation, bfs=False):
|
||
if query is not self.root and self._in_condition(query):
|
||
continue
|
||
if (found := self._limit_of(query)) is not None:
|
||
out.append(found)
|
||
return out
|
||
|
||
def _in_condition(self, node: Any) -> bool:
|
||
from sqlglot import exp
|
||
|
||
while node is not None and node is not self.root:
|
||
if isinstance(node, (exp.Where, exp.Having)) or \
|
||
(isinstance(node.parent, exp.Join) and node.arg_key == "on"):
|
||
return True
|
||
node = node.parent
|
||
return False
|
||
|
||
def _limit_of(self, query: Any) -> LimitFacet | None:
|
||
"""一段的 LIMIT / OFFSET，连同这一段的排序；两样都没写返回 None。"""
|
||
from sqlglot import exp
|
||
|
||
def written(node: Any) -> str | None:
|
||
return node.sql(dialect=self.read, comments=False) if node is not None else None
|
||
|
||
limit, offset = query.args.get("limit"), query.args.get("offset")
|
||
count = written(limit.expression if isinstance(limit, exp.Limit) else limit.args.get("count")) \
|
||
if limit is not None else None
|
||
if offset is None and isinstance(limit, exp.Limit):
|
||
offset = limit.args.get("offset") # 有的方言把 OFFSET 挂在 LIMIT 底下
|
||
skip = written(offset.expression if isinstance(offset, exp.Offset) else offset)
|
||
if skip is not None and skip.strip() == "0":
|
||
skip = None # OFFSET 0 等于没写
|
||
if limit is None and skip is None:
|
||
return None
|
||
return LimitFacet(count=count, offset=skip, order=self._order(query), scope=self._scope_name(query))
|
||
|
||
def _order(self, query: Any) -> tuple[tuple[Part, bool], ...]:
|
||
"""这一段的排序键 (Part, 是否降序)。ORDER BY 1、ORDER BY 别名换成 SELECT 里的表达式（UNION 按第一支的）。"""
|
||
from sqlglot import exp
|
||
|
||
order = query.args.get("order")
|
||
if order is None:
|
||
return ()
|
||
select = query if isinstance(query, exp.Select) else None
|
||
sources = self.sources(select) if select is not None else _Sources()
|
||
selects = list(query.selects)
|
||
aliases = self._aliases(query)
|
||
out = []
|
||
for item in order.expressions:
|
||
target = self._target(item.this if isinstance(item, exp.Ordered) else item, selects, aliases)
|
||
desc = bool(item.args.get("desc")) if isinstance(item, exp.Ordered) else False
|
||
out.append((self.part(self.canonical(target, sources), sources), desc))
|
||
return tuple(out)
|
||
|
||
def _scope_name(self, query: Any) -> str | None:
|
||
from sqlglot import exp
|
||
|
||
if query is self.root:
|
||
return None
|
||
parent = query.parent
|
||
if isinstance(parent, (exp.CTE, exp.Subquery)) and parent.alias:
|
||
return parent.alias
|
||
return "子查询"
|
||
|
||
|
||
# ==========================================================================
|
||
# 比较
|
||
# ==========================================================================
|
||
|
||
|
||
@dataclass(frozen=True)
|
||
class FacetDiff:
|
||
"""一处不同。aspect：time（时间列）/ time_range（同一时间列、范围不同）/ filter / aggregate / join / tables /
|
||
group_by / having / limit（取哪几行：行数、跳过的行数、取前几行时的排序）/ parse。a、b 是两边各自的写法（给人看，
|
||
没有就是 None），text 是一句中文说明。
|
||
detail 只在 time 上有：两边的时间列 [{table, column}]，调用方据此对照数据目录（业务日期）。"""
|
||
|
||
aspect: str
|
||
a: Any
|
||
b: Any
|
||
text: str
|
||
detail: dict[str, Any] | None = None
|
||
|
||
def as_dict(self) -> dict[str, Any]:
|
||
out = {"aspect": self.aspect, "a": self.a, "b": self.b, "text": self.text}
|
||
if self.detail is not None:
|
||
out["detail"] = self.detail
|
||
return out
|
||
|
||
|
||
_CJK_PUNCT = frozenset("，。；：、！？「」『』（）《》【】…—")
|
||
#: 聚合函数的说法
|
||
_VERBS = {"sum": "求和", "count": "计数", "avg": "求平均", "min": "取最小值", "max": "取最大值"}
|
||
|
||
|
||
def _wide(ch: str) -> bool:
|
||
return "⺀" <= ch <= "鿿" or "豈" <= ch <= "" or "" <= ch <= ""
|
||
|
||
|
||
def _say(*parts: str) -> str:
|
||
"""拼一句话：汉字和英文、数字、SQL 之间加一个空格，挨着全角标点的不加，汉字和汉字之间不加。
|
||
|
||
两边的叫法由调用方定（A / B，或者「原流程」「盲算」），所以空格只能拼的时候按字判断。
|
||
"""
|
||
out = ""
|
||
for part in parts:
|
||
if not part:
|
||
continue
|
||
if out and not out[-1].isspace() and not part[0].isspace():
|
||
a, b = out[-1], part[0]
|
||
if not (a in _CJK_PUNCT or b in _CJK_PUNCT or (_wide(a) and _wide(b))):
|
||
out += " "
|
||
out += part
|
||
return out
|
||
|
||
|
||
def catalog_labels(notes: Mapping[str, Mapping[str, Any]] | None) -> dict[str, str]:
|
||
"""数据目录（{表名: notes}）里列的中文名 → diff_facets 的 names：{「表.列」: 中文名}；只在一张表里有、或者各表
|
||
叫法一致的列另记 {列: 中文名}。被驳回的项不算。"""
|
||
out: dict[str, str] = {}
|
||
bare: dict[str, tuple[str, set[str]]] = {}
|
||
for table, raw in (notes or {}).items():
|
||
visible = catalog.visible_notes(raw) if isinstance(raw, Mapping) else {}
|
||
columns = visible.get("columns") if isinstance(visible.get("columns"), Mapping) else {}
|
||
for column, items in columns.items():
|
||
item = items.get("label") if isinstance(items, Mapping) else None
|
||
label = item.get("value") if isinstance(item, Mapping) else None
|
||
if isinstance(label, str) and label.strip():
|
||
out[f"{table}.{column}"] = label.strip()
|
||
bare.setdefault(name_key(str(column)), (str(column), set()))[1].add(label.strip())
|
||
for column, labels in bare.values():
|
||
if len(labels) == 1:
|
||
out.setdefault(column, next(iter(labels)))
|
||
return out
|
||
|
||
|
||
def _labeler(names: Mapping[str, str] | None) -> Any:
|
||
index = {name_key(str(k)): str(v) for k, v in (names or {}).items() if isinstance(v, str) and v.strip()}
|
||
|
||
def label(ref: ColumnRef) -> str | None:
|
||
table, column = ref
|
||
return (index.get(name_key(f"{table}.{column}")) if table else None) or index.get(name_key(column))
|
||
|
||
return label
|
||
|
||
|
||
def _single_column(part: Part, *, loose: bool) -> str | None:
|
||
"""只涉及一列的条件：那一列（表.列；loose 时只看列名），用来把两边对同一列的不同写法配成一对。"""
|
||
if len(part.columns) != 1:
|
||
return None
|
||
table, column = part.columns[0]
|
||
return name_key(column) if loose else f"{name_key(table or '')}.{name_key(column)}"
|
||
|
||
|
||
def _verb(g: Aggregate) -> str:
|
||
return ("去重" if g.distinct else "") + _VERBS.get(g.func, f"用 {g.func.upper()} 汇总")
|
||
|
||
|
||
def _rows(limit: str | None) -> str:
|
||
if limit is None:
|
||
return "不限行数"
|
||
return f"只取前 {limit} 行" if limit.isdigit() else f"按 LIMIT {limit} 取行"
|
||
|
||
|
||
def _skip(offset: str | None) -> str:
|
||
if offset is None:
|
||
return "不跳过行"
|
||
return f"跳过前 {offset} 行" if offset.isdigit() else f"按 OFFSET {offset} 跳过行"
|
||
|
||
|
||
class _Compare:
|
||
"""一次比较：两边的叫法、列的中文名，以及按哪种写法比。
|
||
|
||
两边各有一张只在自己这边出现、又不是关联进来的表（orders 换成了 orders_archive）时，其余各方面按不写表名的
|
||
loose 比：表换了这件事由一条「tables」说清，同一个条件、同一个聚合不再因为表名不同被重复报一遍。
|
||
"""
|
||
|
||
def __init__(self, a: Facets, b: Facets, labels: tuple[str, str], names: Mapping[str, str] | None) -> None:
|
||
self.a, self.b = a, b
|
||
self.la, self.lb = labels
|
||
self.label = _labeler(names)
|
||
joined = {j.table.key for j in (*a.joins, *b.joins)}
|
||
self.ta = [t for t in a.tables if t.key not in {u.key for u in b.tables} and t.key not in joined]
|
||
self.tb = [t for t in b.tables if t.key not in {u.key for u in a.tables} and t.key not in joined]
|
||
self.swapped = len(self.ta) == 1 and len(self.tb) == 1
|
||
|
||
def k(self, part: Part | None) -> str | None:
|
||
if part is None:
|
||
return None
|
||
return part.loose if self.swapped else part.key
|
||
|
||
@staticmethod
|
||
def shown(xs: list[str], ys: list[str], full_xs: list[str], full_ys: list[str]) -> tuple[str, str]:
|
||
"""两边给人看的写法；读起来一样（各自只写列名）却不是同一个东西时，改成一律写表名的写法。"""
|
||
wa, wb = "、".join(xs), "、".join(ys)
|
||
return ("、".join(full_xs), "、".join(full_ys)) if wa == wb else (wa, wb)
|
||
|
||
def named(self, parts: list[Part], *, full: bool = False) -> str:
|
||
"""时间列：有中文名的写「支付时间 paid_at」，几列用顿号隔开。"""
|
||
out = []
|
||
for p in parts:
|
||
text = p.full if full else p.text
|
||
name = self.label(p.columns[0]) if p.columns else None
|
||
out.append(_say(name, text) if name else text)
|
||
return "、".join(out)
|
||
|
||
def one_sided(self, side: str, other: str, part: Part, *, group: bool = False) -> str:
|
||
if group:
|
||
return _say(side, "分组后只保留", part.text, "的组，", other, "没有这个条件")
|
||
if part.excludes:
|
||
return _say(side, "排除了", part.excludes, "的行，", other, "没有")
|
||
return _say(side, "只保留", part.text, "的行，", other, "没有这个条件")
|
||
|
||
# ---- 各个方面
|
||
|
||
def time(self) -> list[FacetDiff]:
|
||
a, b, la, lb = self.a, self.b, self.la, self.lb
|
||
ca = list(_dedupe((t.column for t in a.time), self.k))
|
||
cb = list(_dedupe((t.column for t in b.time), self.k))
|
||
if {self.k(p) for p in ca} != {self.k(p) for p in cb}:
|
||
wa, wb = self.named(ca), self.named(cb)
|
||
if wa == wb:
|
||
wa, wb = self.named(ca, full=True), self.named(cb, full=True)
|
||
if ca and cb:
|
||
text = _say(la, "按", wa, "筛时间，", lb, "按", wb)
|
||
elif ca:
|
||
text = _say(la, "按", wa, "筛时间，", lb, "没有按时间筛选")
|
||
else:
|
||
text = _say(la, "没有按时间筛选，", lb, "按", wb, "筛时间")
|
||
detail = {side: [{"table": p.columns[0][0], "column": p.columns[0][1]} for p in parts if p.columns]
|
||
for side, parts in (("a", ca), ("b", cb))}
|
||
return [FacetDiff("time", "、".join(p.text for p in ca) or None, "、".join(p.text for p in cb) or None,
|
||
text, detail)]
|
||
if {self.k(t.condition) for t in a.time} != {self.k(t.condition) for t in b.time}:
|
||
ra = " AND ".join(t.condition.text for t in a.time)
|
||
rb = " AND ".join(t.condition.text for t in b.time)
|
||
return [FacetDiff("time_range", ra, rb, _say(la, "的时间范围是", ra, "，", lb, "是", rb))]
|
||
return []
|
||
|
||
def filters(self) -> list[FacetDiff]:
|
||
timed = {self.k(t.condition) for t in (*self.a.time, *self.b.time)}
|
||
fa = [p for p in self.a.where if self.k(p) not in timed]
|
||
fb = [p for p in self.b.where if self.k(p) not in timed]
|
||
only_a = [p for p in fa if self.k(p) not in {self.k(q) for q in fb}]
|
||
only_b = [p for p in fb if self.k(p) not in {self.k(q) for q in fa}]
|
||
out: list[FacetDiff] = []
|
||
for p in list(only_a):
|
||
column = _single_column(p, loose=self.swapped)
|
||
mine = [q for q in only_a if column and _single_column(q, loose=self.swapped) == column]
|
||
theirs = [q for q in only_b if column and _single_column(q, loose=self.swapped) == column]
|
||
if len(mine) == 1 and len(theirs) == 1:
|
||
q = theirs[0]
|
||
wa, wb = self.shown([p.text], [q.text], [p.full], [q.full])
|
||
out.append(FacetDiff("filter", p.text, q.text, _say(self.la, "按", wa, "筛选，", self.lb, "按", wb, "筛选")))
|
||
only_a.remove(p)
|
||
only_b.remove(q)
|
||
out += [FacetDiff("filter", p.text, None, self.one_sided(self.la, self.lb, p)) for p in only_a]
|
||
out += [FacetDiff("filter", None, p.text, self.one_sided(self.lb, self.la, p)) for p in only_b]
|
||
return out
|
||
|
||
def aggregates(self) -> list[FacetDiff]:
|
||
la, lb = self.la, self.lb
|
||
|
||
def key(g: Aggregate) -> tuple[str, str | None, bool]:
|
||
return g.func, self.k(g.arg), g.distinct
|
||
|
||
def pair(xs: list[Aggregate], ys: list[Aggregate], same: Any) -> list[tuple[Aggregate, Aggregate]]:
|
||
pairs = []
|
||
for x in list(xs):
|
||
y = next((y for y in ys if same(x, y)), None)
|
||
if y is not None:
|
||
pairs.append((x, y))
|
||
xs.remove(x)
|
||
ys.remove(y)
|
||
return pairs
|
||
|
||
ga = [g for g in self.a.aggregates if key(g) not in {key(h) for h in self.b.aggregates}]
|
||
gb = [g for g in self.b.aggregates if key(g) not in {key(h) for h in self.a.aggregates}]
|
||
# 先配参数相同的（同一列：函数或去重不同），再配函数相同的（同一种算法：列不同）；各剩一个的也配成一对
|
||
pairs = pair(ga, gb, lambda x, y: self.k(x.arg) == self.k(y.arg))
|
||
pairs += pair(ga, gb, lambda x, y: x.func == y.func)
|
||
if len(ga) == 1 and len(gb) == 1:
|
||
pairs.append((ga.pop(), gb.pop()))
|
||
out = []
|
||
for x, y in pairs:
|
||
same_arg = self.k(x.arg) == self.k(y.arg)
|
||
wa, wb = self.shown([x.arg.text], [y.arg.text], [x.arg.full], [y.arg.full]) if not same_arg \
|
||
else (x.arg.text, y.arg.text)
|
||
if same_arg and x.func == y.func:
|
||
# 只差去重：COUNT(DISTINCT order_id) 和 COUNT(order_id)
|
||
text = _say(la, "对", wa, _verb(x) + "，", lb, "没去重") if x.distinct \
|
||
else _say(la, "对", wa, _verb(x) + "时没去重，", lb, _verb(y))
|
||
elif same_arg and x.arg.key != "*":
|
||
# 同一列、算法不同：后半句不再重复列名
|
||
text = _say(la, "对", wa, _verb(x) + "，", lb, _verb(y))
|
||
else:
|
||
what_a = ["数的是行数"] if x.func == "count" and x.arg.key == "*" else ["对", wa, _verb(x)]
|
||
what_b = ["数的是行数"] if y.func == "count" and y.arg.key == "*" else ["对", wb, _verb(y)]
|
||
text = _say(la, *what_a, "，", lb, *what_b)
|
||
out.append(FacetDiff("aggregate", x.text, y.text, text))
|
||
out += [FacetDiff("aggregate", g.text, None, _say(la, "多算了", g.text, "，", lb, "没有")) for g in ga]
|
||
out += [FacetDiff("aggregate", None, g.text, _say(lb, "多算了", g.text, "，", la, "没有")) for g in gb]
|
||
return out
|
||
|
||
def joins(self) -> list[FacetDiff]:
|
||
la, lb = self.la, self.lb
|
||
|
||
def index(f: Facets) -> dict[str, list[JoinFacet]]:
|
||
out: dict[str, list[JoinFacet]] = {}
|
||
for j in f.joins:
|
||
out.setdefault(j.table.key, []).append(j)
|
||
return out
|
||
|
||
ja, jb = index(self.a), index(self.b)
|
||
out: list[FacetDiff] = []
|
||
for key in dict.fromkeys([*ja, *jb]):
|
||
xs, ys = ja.get(key, []), jb.get(key, [])
|
||
for x, y in zip(xs, ys):
|
||
if x.kind != y.kind:
|
||
kx, ky = _JOIN_WORDS.get(x.kind, x.kind), _JOIN_WORDS.get(y.kind, y.kind)
|
||
out.append(FacetDiff("join", kx, ky, _say(la, "用", kx, "关联", x.table.text, "表，", lb, "用", ky)))
|
||
if self.k(x.on) != self.k(y.on):
|
||
xa, ya = (x.on.text if x.on else "（无条件）"), (y.on.text if y.on else "（无条件）")
|
||
out.append(FacetDiff("join", xa, ya, _say(la, "关联", x.table.text, "表的条件是", xa, "，", lb, "是",
|
||
ya)))
|
||
out += [FacetDiff("join", x.table.text, None, _say(la, "关联了", x.table.text, "表，", lb, "没有"))
|
||
for x in xs[len(ys):]]
|
||
out += [FacetDiff("join", None, y.table.text, _say(lb, "关联了", y.table.text, "表，", la, "没有"))
|
||
for y in ys[len(xs):]]
|
||
# 关联之外的表（FROM 的表、子查询里的表）只在一边出现的
|
||
if self.swapped:
|
||
ta, tb = self.ta[0], self.tb[0]
|
||
return out + [FacetDiff("tables", ta.text, tb.text, _say(la, "查的是", ta.text, "表，", lb, "查的是", tb.text,
|
||
"表"))]
|
||
out += [FacetDiff("tables", t.text, None, _say(la, "用到了", t.text, "表，", lb, "没有")) for t in self.ta]
|
||
out += [FacetDiff("tables", None, t.text, _say(lb, "用到了", t.text, "表，", la, "没有")) for t in self.tb]
|
||
return out
|
||
|
||
def group(self) -> list[FacetDiff]:
|
||
a, b = self.a.group_by, self.b.group_by
|
||
if {self.k(p) for p in a} == {self.k(p) for p in b}:
|
||
return []
|
||
wa, wb = self.shown([p.text for p in a], [p.text for p in b], [p.full for p in a], [p.full for p in b])
|
||
if wa and wb:
|
||
text = _say(self.la, "按", wa, "分组，", self.lb, "按", wb, "分组")
|
||
elif wa:
|
||
text = _say(self.la, "按", wa, "分组，", self.lb, "没有分组")
|
||
else:
|
||
text = _say(self.la, "没有分组，", self.lb, "按", wb, "分组")
|
||
return [FacetDiff("group_by", wa or None, wb or None, text)]
|
||
|
||
def having(self) -> list[FacetDiff]:
|
||
ka, kb = {self.k(p) for p in self.a.having}, {self.k(p) for p in self.b.having}
|
||
return [FacetDiff("having", p.text, None, self.one_sided(self.la, self.lb, p, group=True))
|
||
for p in self.a.having if self.k(p) not in kb] + \
|
||
[FacetDiff("having", None, p.text, self.one_sided(self.lb, self.la, p, group=True))
|
||
for p in self.b.having if self.k(p) not in ka]
|
||
|
||
def limit(self) -> list[FacetDiff]:
|
||
"""取哪几行：最外层两边比；CTE、子查询里的按出现的先后一一配对（两边给它起的名字可以不同），整组一样就不报。"""
|
||
def outer(f: Facets) -> LimitFacet | None:
|
||
return next((x for x in f.limits if x.scope is None), None)
|
||
|
||
out = self.rows(outer(self.a), outer(self.b))
|
||
ia = [x for x in self.a.limits if x.scope is not None]
|
||
ib = [x for x in self.b.limits if x.scope is not None]
|
||
if [self.lk(x) for x in ia] != [self.lk(x) for x in ib]:
|
||
for x, y in zip_longest(ia, ib):
|
||
out += self.rows(x, y)
|
||
return out
|
||
|
||
def lk(self, x: LimitFacet | None) -> tuple[Any, ...] | None:
|
||
if x is None:
|
||
return None
|
||
return x.count, x.offset, tuple((self.k(p), desc) for p, desc in x.order)
|
||
|
||
def sorting(self, x: LimitFacet, *, full: bool = False) -> str:
|
||
if not x.order:
|
||
return "没有排序"
|
||
keys = "、".join(_say(p.full if full else p.text, "降序" if desc else "升序") for p, desc in x.order)
|
||
return _say("按", keys, "排")
|
||
|
||
def rows(self, x: LimitFacet | None, y: LimitFacet | None) -> list[FacetDiff]:
|
||
"""一对段（一边可以没有）取的行有什么不同：行数、跳过的行数，两边都限了行时再比排序。"""
|
||
if self.lk(x) == self.lk(y):
|
||
return []
|
||
sa, sb = (x.scope if x else None), (y.scope if y else None)
|
||
la = _say(self.la, "在", sa, "里") if sa else self.la
|
||
lb = _say(self.lb, "在", sb, "里") if sb and sb != sa else self.lb
|
||
out = []
|
||
ca, cb = (x.count if x else None), (y.count if y else None)
|
||
if ca != cb:
|
||
out.append(FacetDiff("limit", ca, cb, _say(la, _rows(ca), "，", lb, _rows(cb))))
|
||
oa, ob = (x.offset if x else None), (y.offset if y else None)
|
||
if oa != ob:
|
||
out.append(FacetDiff("limit", oa, ob, _say(la, _skip(oa), "，", lb, _skip(ob))))
|
||
if x is not None and y is not None and self.lk(x)[2] != self.lk(y)[2]:
|
||
wa, wb = self.sorting(x), self.sorting(y)
|
||
if wa == wb:
|
||
wa, wb = self.sorting(x, full=True), self.sorting(y, full=True)
|
||
out.append(FacetDiff("limit", wa, wb, _say(la, "取行前", wa, "，", lb, wb)))
|
||
return out
|
||
|
||
|
||
def diff_facets(a: Facets, b: Facets, labels: tuple[str, str] = ("A", "B"), *,
|
||
names: Mapping[str, str] | None = None) -> list[FacetDiff]:
|
||
"""逐个方面比两份 facets，每处不同一条，按对结果影响大致从大到小排：时间、筛选、聚合、连接和表、分组、HAVING、
|
||
取哪几行。完全一致返回空列表。
|
||
|
||
labels 是两边的叫法（缺省 A / B，双盲复算可以传「原流程」「盲算」）；names 是列的中文名（{「表.列」或「列」:
|
||
中文名}，可以用 catalog_labels 从数据目录取），给了的话时间列写成「支付时间 paid_at」。任一边解析不了就只返回
|
||
一条 parse，不逐项比较：拿半份结构去比，只会报出一堆不存在的不同。
|
||
"""
|
||
la, lb = labels
|
||
if a.parse_error or b.parse_error:
|
||
if a.parse_error and b.parse_error:
|
||
text = _say(la, "：", a.parse_error, "；", lb, "：", b.parse_error, "；没有逐项比较")
|
||
else:
|
||
side, error = (la, a.parse_error) if a.parse_error else (lb, b.parse_error)
|
||
text = _say(side, "：", error or "", "，没有逐项比较")
|
||
return [FacetDiff("parse", a.parse_error, b.parse_error, text)]
|
||
cmp = _Compare(a, b, labels, names)
|
||
return cmp.time() + cmp.filters() + cmp.aggregates() + cmp.joins() + cmp.group() + cmp.having() + cmp.limit()
|
||
|
||
|
||
__all__ = ["MAX_SQL_CHARS", "PLACEHOLDER", "Aggregate", "ColumnRef", "FacetDiff", "Facets", "JoinFacet", "LimitFacet",
|
||
"NormalizedSql", "Part", "TimePredicate", "catalog_labels", "diff_facets", "facets", "normalize_sql"]
|