rust-store-core 4.6.1

One data engine for MongoDB, MySQL, PostgreSQL and SQLite: a MongoDB-style GQL query language, permission checks, computed columns, command planning and SQL dialect translation. Pure logic, no IO.
Documentation 
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//! GQL 解析 + Aggregate Pipeline 构建器（对应 JS `src/pipeline.js`）
//!
//! GQL 语法（极简，4 个参数）:
//!   ModelName($condition:@c0,$sort:@s1,$skip:@sk,$limit:@l1) {
//!     field1, field2,
//!     RelationName($condition:@c2,$sort:@s3) { field3, NestedRelation { field4 } }
//!   }
//! 值用 `@key` 引用 params 对象。
//!
//! 子模块划分（按职责，非按行数平均切）：
//!   - [`token`]：词法分析
//!   - [`ast`]：AST 数据定义与 JSON 互转
//!   - [`parse`]：语法分析
//!   - [`lookup`]：$lookup / $addFields 阶段构建
//!   - [`group`]：根级 $group / $having 成组聚合（§9.2(1)）
//!   - [`build`]：整条 pipeline 的编排
//!   - [`projection`]：$project 投影构建
//!   - [`util`]：跨模块共享的小工具

mod ast;
mod build;
mod group;
mod lookup;
mod parse;
mod projection;
mod relation_filter;
mod token;
mod util;
pub mod vector;

pub use ast::{Ast, RelAst};
pub(crate) use build::flatten_object_fields_impl;
pub use build::{build_pipeline, flatten_object_fields};
pub use lookup::{build_agg_stages, build_empty_lookup, build_lookup};
pub use parse::{parse, parse_gql};
pub use projection::{build_pipeline_projection, build_projection};
pub(crate) use relation_filter::merge_and;
pub(crate) use relation_filter::plan as plan_relation_filter;
pub use relation_filter::{
    nested_rel_name_from_as, rel_name_from_as, NestedRelFilter, RelPredicate, RelationFilterPlan,
    REL_NESTED_PREFIX, REL_PRED_PREFIX,
};
pub use token::{token_to_value, tokenize, Token};
pub(crate) use util::{is_nullish, param};

// ─── 递归保护 ──────────────────────────────────────────────
pub const MAX_DEPTH: usize = 10;
pub const MAX_PAGINATED_DEPTH: usize = 4;