Struct FromClauseSubquery 

pub struct FromClauseSubquery {
    pub name: String,
    pub plan: Box<Plan>,
    pub columns: Vec<Column>,
    pub result_columns_start_reg: Option<usize>,
    pub materialized_cursor_id: Option<usize>,
    pub cte: Option<FromClauseSubqueryCteMetadata>,
}

A derived table from a FROM clause subquery.

Fields

name: String

The name of the derived table; uses the alias if available.

plan: Box<Plan>

The query plan for the derived table. Can be either a simple SelectPlan or a compound select (UNION/INTERSECT/EXCEPT).

columns: Vec<Column>

The columns of the derived table.

result_columns_start_reg: Option<usize>

The start register for the result columns of the derived table; must be set before data is read from it.

materialized_cursor_id: Option<usize>

The table cursor backing a materialized EphemeralTable representation of this subquery, if one was emitted.

cte: Option<FromClauseSubqueryCteMetadata>

CTE-specific materialization metadata, when this FROM-subquery is a CTE reference rather than an inline derived table.

Implementations

impl FromClauseSubquery

pub fn cte_id(&self) -> Option<usize>

pub fn materialize_hint(&self) -> bool

pub fn shared_materialization(&self) -> bool

pub fn set_shared_materialization(&mut self, shared: bool)

pub fn requires_table_materialization(&self) -> bool

Shared CTE references and explicit MATERIALIZED hints both force a table-backed materialization that can be scanned or probed later.

pub fn supports_direct_index_materialization(&self) -> bool

Only simple single-reference SELECT subqueries can safely use their synthesized seek index as the storage target directly. Compound subqueries still need table-backed storage so their set-operation semantics are preserved before any later SEARCH shape is chosen.

Trait Implementations

impl Clone for FromClauseSubquery

fn clone(&self) -> FromClauseSubquery

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FromClauseSubquery

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

Formats the value using the given formatter.

impl TryClone for FromClauseSubquery

type Error = TryReserveError

fn try_clone(&self) -> Result<Self, Self::Error>