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Item_null_result Class Reference

#include <item.h>

Inheritance diagram for Item_null_result:
Item_null Item_basic_constant Item

List of all members.

Public Member Functions

 Item_null_result (enum_field_types fld_type, Item_result res_type)
bool is_result_field ()
void save_in_result_field (bool no_conversions)
bool check_partition_func_processor (uchar *int_arg)
enum_field_types field_type () const
Item_result result_type () const

Public Attributes


Detailed Description

An item representing NULL values for use with ROLLUP.

When grouping WITH ROLLUP, Item_null_result items are created to represent NULL values in the grouping columns of the ROLLUP rows. To avoid type problems during execution, these objects are created with the same field and result types as the fields of the columns they belong to.

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