#include <materialize_path_parameters.h>

Classes
struct	QueryBlock

Public Attributes
Mem_root_array< QueryBlock >	query_blocks

Mem_root_array< const AccessPath * > *	invalidators

TABLE *	table
	Handle to table to materialize into. More...

Common_table_expr *	cte
	If materializing a CTE, points to it (see m_cte), otherwise nullptr. More...

Query_expression *	unit
	The query expression we are materializing. More...

int	ref_slice

bool	rematerialize
	True if rematerializing on every Init() call (e.g., because we have a dependency on a value from outside the query block). More...

ha_rows	limit_rows
	Used for when pushing LIMIT down to MaterializeIterator; this is more efficient than having a LimitOffsetIterator above the MaterializeIterator, since we can stop materializing when there are enough rows. More...

bool	reject_multiple_rows
	True if this is the top level iterator for a materialized derived table transformed from a scalar subquery which needs run-time cardinality check. More...

Member Data Documentation

◆ cte

Common_table_expr* MaterializePathParameters::cte

If materializing a CTE, points to it (see m_cte), otherwise nullptr.

◆ invalidators

Mem_root_array<const AccessPath *>* MaterializePathParameters::invalidators

◆ limit_rows

ha_rows MaterializePathParameters::limit_rows

Used for when pushing LIMIT down to MaterializeIterator; this is more efficient than having a LimitOffsetIterator above the MaterializeIterator, since we can stop materializing when there are enough rows.

(This is especially important for recursive CTEs.) Note that we cannot have a LimitOffsetIterator below the MaterializeIterator, as that would count wrong if we have deduplication, and would not work at all for recursive CTEs. Set to HA_POS_ERROR for no limit.

◆ query_blocks

Mem_root_array<QueryBlock> MaterializePathParameters::query_blocks

◆ ref_slice

int MaterializePathParameters::ref_slice

See also: JOIN. If we are materializing across JOINs, e.g. derived tables, ref_slice should be left at -1.

◆ reject_multiple_rows

bool MaterializePathParameters::reject_multiple_rows

True if this is the top level iterator for a materialized derived table transformed from a scalar subquery which needs run-time cardinality check.

◆ rematerialize

bool MaterializePathParameters::rematerialize

True if rematerializing on every Init() call (e.g., because we have a dependency on a value from outside the query block).

◆ table

TABLE* MaterializePathParameters::table

Handle to table to materialize into.

◆ unit

Query_expression* MaterializePathParameters::unit

The query expression we are materializing.

The documentation for this struct was generated from the following file:

sql/join_optimizer/materialize_path_parameters.h

Classes

Public Attributes