Enum DecorrelationStrategy 

pub enum DecorrelationStrategy {
    JoinWithGroupBy {
        group_by_cols: Vec<String>,
        join_condition: Vec<(String, String)>,
    },
    LeftJoinWithGroupBy {
        group_by_cols: Vec<String>,
        join_condition: Vec<(String, String)>,
    },
    SemiJoin {
        join_condition: Vec<(String, String)>,
    },
    AntiJoin {
        join_condition: Vec<(String, String)>,
    },
    DistinctJoin {
        join_condition: Vec<(String, String)>,
    },
}

Strategy for decorrelating a subquery

Variants

JoinWithGroupBy

Convert to INNER JOIN with GROUP BY on correlation columns Used for scalar subqueries with aggregation

Fields

group_by_cols: Vec<String>

Columns to group by (the correlation columns)

join_condition: Vec<(String, String)>

Join condition (equality on correlation columns)

LeftJoinWithGroupBy

Convert to LEFT JOIN (for nullable results)

Fields

group_by_cols: Vec<String>

join_condition: Vec<(String, String)>

SemiJoin

Convert IN subquery to SEMI JOIN

Fields

join_condition: Vec<(String, String)>

AntiJoin

Convert NOT IN/NOT EXISTS to ANTI JOIN

Fields

join_condition: Vec<(String, String)>

DistinctJoin

Apply DISTINCT to inner query and join Used when inner returns duplicates but only existence matters

Fields

join_condition: Vec<(String, String)>

Trait Implementations

impl Clone for DecorrelationStrategy

fn clone(&self) -> DecorrelationStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DecorrelationStrategy

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

Formats the value using the given formatter.

impl PartialEq for DecorrelationStrategy

fn eq(&self, other: &DecorrelationStrategy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for DecorrelationStrategy

impl StructuralPartialEq for DecorrelationStrategy