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//! Relational Query
//!
//! Strictly typed AST for descibing relational queries.

mod expr;
mod fold;
mod ids;
mod transform;

pub use expr::{Expr, ExprKind, UnOp};
pub use fold::*;
pub use ids::*;
pub use transform::*;

use enum_as_inner::EnumAsInner;
use serde::{Deserialize, Serialize};

use super::pl::TableExternRef;
use super::pl::{ColumnSort, QueryDef, Range, WindowFrame};

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
pub struct Query {
    pub def: QueryDef,

    pub tables: Vec<TableDecl>,
    pub relation: Relation,
}

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize, EnumAsInner)]
pub enum Relation {
    ExternRef(TableExternRef, Vec<ColumnDecl>),
    Pipeline(Vec<Transform>),
}

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
pub struct TableDecl {
    pub id: TId,

    /// Given name of this table (name of the CTE)
    pub name: Option<String>,

    pub relation: Relation,
}

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
pub struct TableRef {
    // referenced table
    pub source: TId,

    // new column definitions are required because there may be multiple instances
    // of this table in the same query
    pub columns: Vec<ColumnDecl>,

    /// Given name of this table (table alias)
    pub name: Option<String>,
}