Derived_key Class Reference

This structure is used to keep info about possible key for the result table of a derived table/view. More...

#include <table.h>

Public Attributes
table_map	referenced_by
Field_map	used_fields
uint	key_part_count {0}

Detailed Description

This structure is used to keep info about possible key for the result table of a derived table/view.

The 'referenced_by' is the table map of tables to which this possible key corresponds. The 'used_field' is a map of fields of which this key consists of. See also the comment for the Table_ref::update_derived_keys function.

Member Data Documentation

key_part_count

uint Derived_key::key_part_count {0}

referenced_by

table_map Derived_key::referenced_by

used_fields

Field_map Derived_key::used_fields

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

• sql/table.h