Struct ExistsCorrelationInfo 

pub struct ExistsCorrelationInfo {
    pub outer_column: String,
    pub outer_table: Option<String>,
    pub inner_column: String,
    pub inner_table: String,
    pub outer_column_lower: String,
    pub outer_qualified_lower: Option<String>,
    pub additional_predicate: Option<Expression>,
    pub index_cache_key: String,
}

Pre-computed info for index nested loop EXISTS lookups to avoid per-row string operations. This caches the pre-computed lowercase column names for O(1) outer row lookups.

Fields

outer_column: String

The outer column name in original case

outer_table: Option<String>

The outer table name (optional)

inner_column: String

The inner column name

inner_table: String

The inner table name

outer_column_lower: String

Pre-computed lowercase outer column name for fast HashMap lookup

outer_qualified_lower: Option<String>

Pre-computed qualified outer column name (e.g., “u.id”) in lowercase

additional_predicate: Option<Expression>

The additional predicate beyond the correlation (if any)

index_cache_key: String

Pre-computed index cache key (“table:column”) to avoid per-probe format! allocation

Trait Implementations

impl Clone for ExistsCorrelationInfo

fn clone(&self) -> ExistsCorrelationInfo

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.