Parser_partition_info Class Reference

#include <partition_info.h>

Inheritance diagram for Parser_partition_info:

Public Member Functions
	Parser_partition_info (partition_info *const part_info, partition_element *const current_partition, partition_element *const curr_part_elem, part_elem_value *curr_list_val, uint curr_list_object)
void	init_col_val (part_column_list_val *col_val, Item *item)
	Initialise part_elem_value object at setting of a new object. More...
part_column_list_val *	add_column_value ()
	Create a new column value in current list. More...
bool	add_max_value ()
	Create a new column value in current list with maxvalue. More...
bool	reorganize_into_single_field_col_val ()
	Reorganize the preallocated buffer into a single field col list. More...
bool	init_column_part ()
	Initialize a new column for VALUES {LESS THAN|IN}. More...
bool	add_column_list_value (THD *thd, Item *item)
	Add a column value in VALUES LESS THAN or VALUES IN. More...

Public Attributes
partition_info *const	part_info
partition_element *const	current_partition
partition_element *const	curr_part_elem
part_elem_value *	curr_list_val
uint	curr_list_object
uint	count_curr_subparts

Constructor & Destructor Documentation

Parser_partition_info()

Parser_partition_info::Parser_partition_info ( partition_info *const  part_info, partition_element *const  current_partition, partition_element *const  curr_part_elem, part_elem_value *  curr_list_val, uint  curr_list_object  )

inline

Member Function Documentation

add_column_list_value()

bool Parser_partition_info::add_column_list_value	(	THD *	thd,
		Item *	item
	)

Add a column value in VALUES LESS THAN or VALUES IN.

Parameters

thd	Thread object
item	Item object representing column value

Returns

Operation status

Return values

true	Failure
false	Success

Note

Called from parser.

add_column_value()

part_column_list_val * Parser_partition_info::add_column_value

(

)

Create a new column value in current list.

Returns

Pointer to a new part_column_list_val

Return values

!=	0 A part_column_list_val object which have been inserted into its list
NULL	Memory allocation failure

Note

Called from parser.

add_max_value()

bool Parser_partition_info::add_max_value

(

)

Create a new column value in current list with maxvalue.

Returns

Operation status

Return values

true	Error
false	Success

Note

Called from parser.

init_col_val()

void Parser_partition_info::init_col_val	(	part_column_list_val *	col_val,
		Item *	item
	)

Initialise part_elem_value object at setting of a new object.

Parameters

col_val	Column value object to be initialised
item	Item object representing column value

Note

Helper functions to functions called by parser.

init_column_part()

bool Parser_partition_info::init_column_part

(

)

Initialize a new column for VALUES {LESS THAN|IN}.

Initialize part_info object for receiving a set of column values for a partition, called when parser reaches VALUES LESS THAN or VALUES IN.

Returns

Operation status

Return values

true	Failure
false	Success

reorganize_into_single_field_col_val()

bool Parser_partition_info::reorganize_into_single_field_col_val

(

)

Reorganize the preallocated buffer into a single field col list.

Returns

Operation status

Return values

true	Failure
false	Success

Note

In the case of ALTER TABLE ADD/REORGANIZE PARTITION for LIST partitions we can specify list values as: VALUES IN (v1, v2,,,, v17) if we're using the first partitioning variant with a function or a column list partitioned table with one partition field. In this case the parser knows not the number of columns start with and allocates MAX_REF_PARTS in the array. If we try to allocate something beyond MAX_REF_PARTS we will call this function to reorganize into a structure with num_columns = 1. Also when the parser knows that we used LIST partitioning and we used a VALUES IN like above where number of values was smaller than MAX_REF_PARTS or equal, then we will reorganize after discovering this in the parser.

Member Data Documentation

count_curr_subparts

uint Parser_partition_info::count_curr_subparts

curr_list_object

uint Parser_partition_info::curr_list_object

curr_list_val

part_elem_value* Parser_partition_info::curr_list_val

curr_part_elem

partition_element* const Parser_partition_info::curr_part_elem

current_partition

partition_element* const Parser_partition_info::current_partition

part_info

partition_info* const Parser_partition_info::part_info

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

• sql/partition_info.h
• sql/partition_info.cc