materialize_iterator Namespace Reference

Classes
struct	Operand
	An operand (query block) to be materialized by MaterializeIterator. More...
class	SpillState
	Contains spill state for set operations' use of in-memory hash map. More...

Typedefs
using	Operands = Mem_root_array< materialize_iterator::Operand >

Functions
RowIterator *	CreateIterator (THD *thd, Mem_root_array< materialize_iterator::Operand > operands, const MaterializePathParameters *path_params, unique_ptr_destroy_only< RowIterator > table_iterator, JOIN *join)
	Create an iterator that materializes a set of row into a temporary table and sets up a (pre-existing) iterator to access that. More...

Typedef Documentation

Operands

using materialize_iterator::Operands = typedef Mem_root_array<materialize_iterator::Operand>

Function Documentation

CreateIterator()

RowIterator * materialize_iterator::CreateIterator	(	THD *	thd,
		Mem_root_array< materialize_iterator::Operand >	operands,
		const MaterializePathParameters *	path_params,
		unique_ptr_destroy_only< RowIterator >	table_iterator,
		JOIN *	join
	)

Create an iterator that materializes a set of row into a temporary table and sets up a (pre-existing) iterator to access that.

See also

MaterializeIterator.

Parameters

thd	Thread handler.
operands	List of operands (query blocks) to materialize.
path_params	MaterializePath settings.
table_iterator	Iterator used for accessing the temporary table after materialization.
join	When materializing within the same JOIN (e.g., into a temporary table before sorting), as opposed to a derived table or a CTE, we may need to change the slice on the join before returning rows from the result table. If so, join and ref_slice would need to be set, and query_blocks_to_materialize should contain only one member, with the same join.

Returns

the iterator.