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//! JOIN operation types for Shape AST
use serde::{Deserialize, Serialize};
use super::expressions::Expr;
/// JOIN type
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum JoinType {
Inner,
Left,
Right,
Full,
Cross,
}
/// JOIN condition
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum JoinCondition {
/// ON expression (e.g., ON a.id = b.id)
On(Expr),
/// USING columns (e.g., USING (id, name))
Using(Vec<String>),
/// Temporal join (within a time duration)
Temporal {
/// Time column on left side
left_time: String,
/// Time column on right side
right_time: String,
/// Maximum time difference
within: crate::data::Timeframe,
},
/// Natural join (implicit matching columns)
Natural,
}
/// A JOIN clause
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JoinClause {
/// Type of join
pub join_type: JoinType,
/// Right side of the join
pub right: JoinSource,
/// Join condition
pub condition: JoinCondition,
}
/// Source for a JOIN
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum JoinSource {
/// Named data source (table/symbol)
Named(String),
/// Subquery
Subquery(Box<super::queries::Query>),
/// CTE reference
Cte(String),
}