#include <build_interesting_orders.h>

Public Attributes
int	ordering_idx

hypergraph::NodeMap	required_nodes

bool	aggregates_required

bool	sort_ahead_only
	True if this ordering can be used for sort-ahead only, and not for sorting after the joining and aggregation are done (that is, sorting for DISTINCT, WINDOW or ORDER BY). More...

ORDER *	order

Member Data Documentation

◆ aggregates_required

bool SortAheadOrdering::aggregates_required

◆ order

ORDER* SortAheadOrdering::order

◆ ordering_idx

int SortAheadOrdering::ordering_idx

◆ required_nodes

hypergraph::NodeMap SortAheadOrdering::required_nodes

◆ sort_ahead_only

bool SortAheadOrdering::sort_ahead_only

True if this ordering can be used for sort-ahead only, and not for sorting after the joining and aggregation are done (that is, sorting for DISTINCT, WINDOW or ORDER BY).

This flag is set for orderings on expressions that have not been added to join->fields, and their availability cannot be relied on at the end of the query execution, as they are not included in the temporary table if there is a materialization step. If an ordering marked as sort-ahead-only is actually useful after aggregation, there is usually an equivalent ordering using expressions that do exist in join->fields, and that can be used instead.

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