Struct SemiJoinInfo 

pub struct SemiJoinInfo {
    pub outer_column: String,
    pub outer_table: Option<String>,
    pub inner_column: String,
    pub inner_table: String,
    pub inner_alias: Option<String>,
    pub non_correlated_where: Option<Arc<Expression>>,
    pub is_negated: bool,
}

Information extracted from an EXISTS subquery for semi-join optimization. Example: EXISTS (SELECT 1 FROM orders o WHERE o.user_id = u.id AND o.amount > 500)

• outer_column: “u.id” (or “id” with outer table “u”)
• inner_column: “o.user_id” (or “user_id”)
• inner_table: “orders”
• inner_alias: Some(“o”)
• non_correlated_where: Some(“o.amount > 500”)

Fields

outer_column: String

The outer column referenced in the correlation (e.g., “id” from “u.id”)

outer_table: Option<String>

The outer table alias if qualified (e.g., “u” from “u.id”)

inner_column: String

The inner column used in the correlation (e.g., “user_id” from “o.user_id”)

inner_table: String

The inner table name

inner_alias: Option<String>

The inner table alias if present

non_correlated_where: Option<Arc<Expression>>

Non-correlated part of the WHERE clause (filters only on inner table) Uses Arc to avoid cloning expression trees during semi-join optimization

is_negated: bool

Whether this is NOT EXISTS

Trait Implementations

impl Debug for SemiJoinInfo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.