Drizzled Public API Documentation

drizzled::Item_allany_subselect Class Reference
Inheritance diagram for drizzled::Item_allany_subselect:
drizzled::Item_in_subselect drizzled::Item_exists_subselect drizzled::Item_subselect drizzled::Item_result_field drizzled::Item drizzled::memory::SqlAlloc

List of all members.

Public Types

enum  enum_exec_method { NOT_TRANSFORMED, SEMI_JOIN, IN_TO_EXISTS, MATERIALIZATION }
enum  trans_res { RES_OK, RES_REDUCE, RES_ERROR }
enum  subs_type {
  UNKNOWN_SUBS, SINGLEROW_SUBS, EXISTS_SUBS, IN_SUBS,
  ALL_SUBS, ANY_SUBS
}
enum  Type {
  FIELD_ITEM = 0, FUNC_ITEM, SUM_FUNC_ITEM, STRING_ITEM,
  INT_ITEM, REAL_ITEM, NULL_ITEM, VARBIN_ITEM,
  COPY_STR_ITEM, FIELD_AVG_ITEM, DEFAULT_VALUE_ITEM, PROC_ITEM,
  COND_ITEM, REF_ITEM, FIELD_STD_ITEM, FIELD_VARIANCE_ITEM,
  INSERT_VALUE_ITEM, SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM,
  TYPE_HOLDER, PARAM_ITEM, BOOLEAN_ITEM, DECIMAL_ITEM
}
enum  traverse_order { T_POSTFIX, T_PREFIX }
enum  cond_result { COND_UNDEF, COND_OK, COND_TRUE, COND_FALSE }

Public Member Functions

 Item_allany_subselect (Item *left_expr, chooser_compare_func_creator fc, Select_Lex *select_lex, bool all)
subs_type substype ()
trans_res select_transformer (Join *join)
virtual void print (String *str)
bool * get_cond_guard (int i)
void set_cond_guard_var (int i, bool v)
bool have_guarded_conds ()
void cleanup ()
void reset ()
trans_res select_in_like_transformer (Join *join, const Comp_creator *func)
trans_res single_value_transformer (Join *join, const Comp_creator *func)
trans_res row_value_transformer (Join *join)
trans_res single_value_in_to_exists_transformer (Join *join, const Comp_creator *func)
trans_res row_value_in_to_exists_transformer (Join *join)
virtual bool exec ()
int64_t val_int ()
double val_real ()
Stringval_str (String *)
type::Decimalval_decimal (type::Decimal *)
void update_null_value ()
bool val_bool ()
void top_level_item ()
bool is_top_level_item ()
bool test_limit (Select_Lex_Unit *unit)
bool fix_fields (Session *session, Item **ref)
bool setup_engine ()
bool init_left_expr_cache ()
bool is_expensive_processor (unsigned char *arg)
enum Item_result result_type () const
void fix_length_and_dec ()
virtual void init (Select_Lex *select_lex, select_result_interceptor *result)
bool assigned ()
void assigned (bool a)
enum Type type () const
bool is_null ()
table_map used_tables () const
table_map not_null_tables () const
bool const_item () const
table_map get_used_tables_cache ()
bool get_const_item_cache ()
Itemget_tmp_table_item (Session *session)
void update_used_tables ()
bool change_engine (subselect_engine *eng)
bool is_evaluated () const
bool is_uncacheable () const
virtual void reset_value_registration ()
enum_parsing_place place ()
bool walk (Item_processor processor, bool walk_subquery, unsigned char *arg)
Select_Lex * get_select_lex ()
Fieldget_tmp_table_field ()
Fieldtmp_table_field (Table *)
void set_result_field (Field *field)
bool is_result_field ()
void save_in_result_field (bool no_conversions)
bool is_unsigned () const
virtual bool negative () const
void set_name (str_ref arg)
void set_name (const char *arg)
void set_name (const char *str, uint32_t length, const charset_info_st *cs=system_charset_info)
void init_make_field (SendField *tmp_field, enum_field_types type)
virtual void make_field (SendField *field)
Fieldmake_string_field (Table *table)
virtual void fix_after_pullout (Select_Lex *new_parent, Item **ref)
void quick_fix_field ()
virtual int save_in_field (Field *field, bool no_conversions)
virtual void save_org_in_field (Field *field)
virtual int save_safe_in_field (Field *field)
virtual void send (plugin::Client *client, String *str)
virtual bool eq (const Item *, bool binary_cmp) const
virtual Item_result cast_to_int_type () const
virtual enum_field_types string_field_type () const
virtual enum_field_types field_type () const
virtual int64_t val_int_endpoint (bool left_endp, bool *incl_endp)
uint64_t val_uint ()
Stringval_string_from_real (String *str)
Stringval_string_from_int (String *str)
Stringval_string_from_decimal (String *str)
type::Decimalval_decimal_from_real (type::Decimal *decimal_value)
type::Decimalval_decimal_from_int (type::Decimal *decimal_value)
type::Decimalval_decimal_from_string (type::Decimal *decimal_value)
type::Decimalval_decimal_from_date (type::Decimal *decimal_value)
type::Decimalval_decimal_from_time (type::Decimal *decimal_value)
int64_t val_int_from_decimal ()
double val_real_from_decimal ()
bool save_time_in_field (Field *field)
bool save_date_in_field (Field *field)
int save_str_value_in_field (Field *field, String *result)
virtual const char * full_name (void) const
virtual double val_result ()
virtual int64_t val_int_result ()
virtual Stringstr_result (String *tmp)
virtual type::Decimalval_decimal_result (type::Decimal *val)
virtual bool val_bool_result ()
virtual bool basic_const_item () const
virtual Itemclone_item ()
virtual cond_result eq_cmp_result () const
uint32_t float_length (uint32_t decimals_par) const
virtual uint32_t decimal_precision () const
int decimal_int_part () const
virtual bool const_during_execution () const
void print_item_w_name (String *)
virtual void split_sum_func (Session *session, Item **ref_pointer_array, List< Item > &fields)
void split_sum_func (Session *session, Item **ref_pointer_array, List< Item > &fields, Item **ref, bool skip_registered)
virtual bool get_date (type::Time &ltime, uint32_t fuzzydate)
virtual bool get_time (type::Time &ltime)
virtual bool get_date_result (type::Time &ltime, uint32_t fuzzydate)
virtual bool is_bool_func (void)
virtual void no_rows_in_result (void)
virtual Itemcopy_or_same (Session *session)
virtual Itemcopy_andor_structure (Session *session)
virtual Itemreal_item (void)
virtual const Itemreal_item (void) const
virtual const charset_info_stcompare_collation ()
virtual Itemtransform (Item_transformer transformer, unsigned char *arg)
virtual Itemcompile (Item_analyzer analyzer, unsigned char **arg_p, Item_transformer transformer, unsigned char *arg_t)
virtual void traverse_cond (Cond_traverser traverser, void *arg, traverse_order order)
virtual bool remove_dependence_processor (unsigned char *arg)
virtual bool collect_item_field_processor (unsigned char *arg)
virtual bool find_item_in_field_list_processor (unsigned char *arg)
virtual bool change_context_processor (unsigned char *context)
virtual bool register_field_in_read_map (unsigned char *arg)
virtual bool subst_argument_checker (unsigned char **arg)
virtual bool cache_const_expr_analyzer (unsigned char **arg)
virtual Itemcache_const_expr_transformer (unsigned char *arg)
virtual Itemequal_fields_propagator (unsigned char *arg)
virtual bool set_no_const_sub (unsigned char *arg)
virtual Itemreplace_equal_field (unsigned char *arg)
virtual uint32_t cols ()
virtual Itemelement_index (uint32_t i)
virtual Item ** addr (uint32_t i)
virtual bool check_cols (uint32_t c)
virtual bool null_inside ()
virtual void bring_value ()
Fieldtmp_table_field_from_field_type (Table *table, bool fixed_length)
virtual Itemneg_transformer (Session *session)
virtual Itemupdate_value_transformer (unsigned char *select_arg)
virtual Itemsafe_charset_converter (const charset_info_st *const tocs)
void delete_self ()
virtual bool result_as_int64_t ()
bool is_datetime ()
virtual bool is_expensive ()
Stringcheck_well_formed_result (String *str, bool send_error=0)
bool eq_by_collation (Item *item, bool binary_cmp, const charset_info_st *const cs)
uint32_t char_to_byte_length_safe (uint32_t char_length_arg, uint32_t mbmaxlen_arg)
uint32_t max_char_length () const
void fix_char_length (uint32_t max_char_length_arg)

Static Public Member Functions

static const charset_info_stdefault_charset ()
static void * operator new (size_t size)
static void * operator new (size_t size, Root &root)
static void * operator new (size_t size, Root *root)
static void * operator new[] (size_t size)
static void * operator new[] (size_t size, Root &root)
static void * operator new[] (size_t size, Root *root)
static void operator delete (void *)
static void operator delete (void *, Root &)
static void operator delete (void *, Root *)
static void operator delete[] (void *)
static void operator delete[] (void *, Root &)
static void operator delete[] (void *, Root *)

Public Attributes

chooser_compare_func_creator func_creator
Comp_creatorfunc
bool all
Itemleft_expr
bool * pushed_cond_guards
int sj_convert_priority
TableListexpr_join_nest
enum_exec_method exec_method
Item_func_not_allupper_item
Sessionsession
Itemsubstitution
Select_Lex_Unit * unit
bool engine_changed
bool changed
bool is_correlated
Fieldresult_field
String str_value
const char * name
uint32_t name_length
Itemnext
uint32_t max_length
int8_t marker
uint8_t decimals
bool fixed
bool maybe_null
bool null_value
bool unsigned_flag
bool with_sum_func
bool is_autogenerated_name
bool with_subselect
DTCollation collation
Item_result cmp_context

Protected Member Functions

SessiongetSession ()

Protected Attributes

List< Cached_item > * left_expr_cache
bool first_execution
Itemexpr
Item_in_optimizeroptimizer
bool was_null
bool abort_on_null
bool value
subselect_engineengine
subselect_engineold_engine
table_map used_tables_cache
uint32_t max_columns
enum_parsing_place parsing_place
bool have_to_be_excluded
bool const_item_cache

Detailed Description

Definition at line 370 of file subselect.h.


Member Function Documentation

virtual bool drizzled::Item::basic_const_item ( ) const
inlinevirtualinherited
bool drizzled::Item::cache_const_expr_analyzer ( unsigned char **  arg)
virtualinherited

Check if an item is a constant one and can be cached.

Parameters:
arg[out] TRUE <=> Cache this item.
Returns:
TRUE Go deeper in item tree.
FALSE Don't go deeper in item tree.

Definition at line 1262 of file item.cc.

References drizzled::Item::basic_const_item(), and drizzled::Item::const_item().

Referenced by drizzled::Join::cache_const_exprs().

Item * drizzled::Item::cache_const_expr_transformer ( unsigned char *  arg)
virtualinherited

Cache item if needed.

Parameters:
argTRUE <=> Cache this item.
Returns:
cache if cache needed.
this otherwise.

Definition at line 1297 of file item.cc.

Referenced by drizzled::Join::cache_const_exprs().

Item * drizzled::Item::compile ( Item_analyzer  analyzer,
unsigned char **  arg_p,
Item_transformer  transformer,
unsigned char *  arg_t 
)
virtualinherited

This function performs a generic "compilation" of the Item tree. The process of compilation is assumed to go as follows:

{
if (this->*some_analyzer(...))
{
compile children if any;
this->*some_transformer(...);
}
}

i.e. analysis is performed top-down while transformation is done bottom-up.

Reimplemented in drizzled::Item_cond, and drizzled::Item_func.

Definition at line 585 of file item.cc.

Referenced by drizzled::build_equal_items_for_cond(), drizzled::Join::cache_const_exprs(), and drizzled::Item_func::compile().

virtual bool drizzled::Item::const_during_execution ( ) const
inlinevirtualinherited

Returns true if this is constant but its value may be not known yet. (Can be used for parameters of prep. stmts or of stored procedures.)

Reimplemented in drizzled::Item_sum.

Definition at line 503 of file item.h.

bool drizzled::Item_subselect::const_item ( ) const
virtualinherited

Returns true if this is constant (during query execution, i.e. its value will not change until next fix_fields) and its value is known.

Reimplemented from drizzled::Item.

Definition at line 384 of file subselect.cc.

bool drizzled::Item::eq ( const Item item,
bool  binary_cmp 
) const
virtualinherited
bool drizzled::Item::eq_by_collation ( Item item,
bool  binary_cmp,
const charset_info_st *const  cs 
)
inherited

Compares two items using a given collation

This method works exactly as Item::eq if the collation cs coincides with the collation of the compared objects. Otherwise, first the collations that differ from cs are replaced for cs and then the items are compared by Item::eq. After the comparison the original collations of items are restored.

Parameters:
Pointerto the item to compare with
Compareas binary?
Pointerto the collation to use when comparing strings
Return values:
trueif compared items has been detected as equal
falseotherwise

Definition at line 1081 of file item.cc.

References drizzled::Item::eq().

void drizzled::Item::fix_after_pullout ( Select_Lex *  new_parent,
Item **  ref 
)
virtualinherited

Fix after some tables has been pulled out. Basically re-calculate all attributes that are dependent on the tables.

Reimplemented in drizzled::Item_cond, drizzled::Item_func, drizzled::Item_ref, drizzled::Item_field, drizzled::Item_row, and drizzled::Item_outer_ref.

Definition at line 75 of file item.cc.

Referenced by drizzled::Item_outer_ref::fix_after_pullout(), and drizzled::Item_row::fix_after_pullout().

bool drizzled::Item::get_date ( type::Time ltime,
uint32_t  fuzzydate 
)
virtualinherited
Select_Lex * drizzled::Item_subselect::get_select_lex ( )
inherited

Get the Select_Lex structure associated with this Item.

Returns:
the Select_Lex structure associated with this Item

Definition at line 133 of file subselect.cc.

Referenced by drizzled::Item_singlerow_subselect::invalidate_and_restore_select_lex().

bool drizzled::Item::get_time ( type::Time ltime)
virtualinherited

Get time of first argument.

As a extra convenience the time structure is reset on error!

Reimplemented in drizzled::Item_date_typecast, drizzled::Item_field, drizzled::function::cast::Time, and drizzled::Item_func_curtime.

Definition at line 494 of file item.cc.

References drizzled::Item::val_str().

Referenced by drizzled::Item::send().

bool drizzled::Item_in_subselect::init_left_expr_cache ( )
inherited

Initialize the cache of the left operand of the IN predicate.

Note:
This method has the same purpose as alloc_group_fields(), but it takes a different kind of collection of items, and the list we push to is dynamically allocated.
Return values:
trueif a memory allocation error occurred or the cache is not applicable to the current query
falseif success

Definition at line 1809 of file subselect.cc.

References drizzled::new_Cached_item(), and drizzled::Join::tables.

bool drizzled::Item::is_expensive ( )
virtualinherited

Tests whether an expression is expensive to compute. Used during optimization to avoid computing expensive expressions during this phase. Also used to force temp tables when sorting on expensive functions.

Todo:

Normally we should have a method: cost Item::execution_cost(), where 'cost' is either 'double' or some structure of various cost parameters.

*NOTE This function is now used to prevent evaluation of materialized IN subquery predicates before it is allowed. grep for DontEvaluateMaterializedSubqueryTooEarly to see the uses.

Definition at line 688 of file item.cc.

Referenced by drizzled::Join::optimize().

bool drizzled::Item_subselect::is_null ( )
inlinevirtualinherited

The method allows to determine nullness of a complex expression without fully evaluating it, instead of calling val/result*() then checking null_value. Used in Item_func_isnull/Item_func_isnotnull and Item_sum_count/Item_sum_count_distinct. Any new item which can be NULL must implement this method.

Reimplemented from drizzled::Item.

Definition at line 91 of file subselect.h.

References drizzled::Item::null_value, and drizzled::Item::update_null_value().

Field * drizzled::Item::make_string_field ( Table table)
inherited

Create a field to hold a string value from an item.

If max_length > CONVERT_IF_BIGGER_TO_BLOB create a blob
If max_length > 0 create a varchar
If max_length == 0 create a CHAR(0)

Parameters:
tableTable for which the field is created

Definition at line 1103 of file item.cc.

References drizzled::Item::maybe_null, and drizzled::Item::name.

Referenced by drizzled::create_tmp_field_from_item(), and drizzled::Item::tmp_table_field_from_field_type().

void drizzled::Item::no_rows_in_result ( void  )
virtualinherited
table_map drizzled::Item_subselect::not_null_tables ( ) const
inlinevirtualinherited

Return table map of tables that can't be NULL tables (tables that are used in a context where if they would contain a NULL row generated by a LEFT or RIGHT join, the item would not be true). This expression is used on WHERE item to determinate if a LEFT JOIN can be converted to a normal join. Generally this function should return used_tables() if the function would return null if any of the arguments are null As this is only used in the beginning of optimization, the value don't have to be updated in update_used_tables()

Reimplemented from drizzled::Item.

Definition at line 100 of file subselect.h.

void drizzled::Item_allany_subselect::print ( String str)
virtual

This method is used for to:

  • to generate a view definition query (SELECT-statement);
  • to generate a SQL-query for EXPLAIN EXTENDED;
  • to generate a SQL-query to be shown in INFORMATION_SCHEMA;
  • debug.

For more information about view definition query, INFORMATION_SCHEMA query and why they should be generated from the Item-tree,

See also:
register_view().

Reimplemented from drizzled::Item_in_subselect.

Definition at line 1859 of file subselect.cc.

References drizzled::Item::print().

void drizzled::Item::quick_fix_field ( )
inlineinherited

Should be used in case where we are sure that we do not need complete fix_fields() procedure.

Definition at line 207 of file item.h.

Referenced by drizzled::build_equal_items_for_cond(), drizzled::check_row_equality(), drizzled::check_simple_equality(), drizzled::eliminate_item_equal(), and drizzled::Join::exec().

bool drizzled::Item::result_as_int64_t ( )
virtualinherited

Returns true for Items representing DATE/TIME functions and DATE/TIME table fields. Those Items have result_type()==STRING_RESULT (and not INT_RESULT), but their values should be compared as integers (because the integer representation is more precise than the string one).

Reimplemented in drizzled::Item_datetime_typecast, drizzled::Item_ref, drizzled::Item_date_typecast, drizzled::Item_field, drizzled::Item_date_func, drizzled::Item_date, drizzled::function::cast::Time, drizzled::Item_time, drizzled::Item_func_min_max, and drizzled::Item_cache_int.

Definition at line 683 of file item.cc.

Referenced by drizzled::FileSort::sortlength().

Item_subselect::trans_res drizzled::Item_in_subselect::row_value_in_to_exists_transformer ( Join join)
inherited

Tranform a (possibly non-correlated) IN subquery into a correlated EXISTS.

Todo:
The IF-ELSE below can be refactored so that there is no duplication of the statements that create the new conditions. For this we have to invert the IF and the FOR statements as this: for (each left operand) create the equi-join condition if (is_having_used || !abort_on_null) create the "is null" and is_not_null_test items if (is_having_used) add the equi-join and the null tests to HAVING else add the equi-join and the "is null" to WHERE add the is_not_null_test to HAVING

Definition at line 1395 of file subselect.cc.

References drizzled::Item::fixed, drizzled::in_left_expr_name, drizzled::Item::maybe_null, drizzled::Item::name, drizzled::Join::select_lex, and drizzled::Item::top_level_item().

Referenced by drizzled::Item_in_subselect::setup_engine().

int drizzled::Item::save_str_value_in_field ( Field field,
String result 
)
inherited

Stores a string value in field directly

The method is used by Item_*::save_in_field implementations when we don't need to calculate the value to store

See also:
Item_string::save_in_field() implementation for example
Parameters:
Pointerto field where to store
Pointerto the string value to be stored
Return values:
Nonzerovalue if error

Check if the Item is null and stores the NULL or the result value in the field accordingly.

Definition at line 272 of file item.cc.

Item_subselect::trans_res drizzled::Item_in_subselect::select_in_like_transformer ( Join join,
const Comp_creator func 
)
inherited

Prepare IN/ALL/ANY/SOME subquery transformation and call appropriate transformation function.

To decide which transformation procedure (scalar or row) applicable here we have to call fix_fields() for left expression to be able to call cols() method on it. Also this method make arena management for underlying transformation methods.

Parameters:
joinJOIN object of transforming subquery
funccreator of condition function of subquery
Return values:
RES_OKOK
RES_REDUCEOK, and current subquery was reduced during transformation
RES_ERRORError

Definition at line 1613 of file subselect.cc.

References drizzled::Item::fixed.

void drizzled::Item::send ( plugin::Client client,
String str 
)
virtualinherited
void drizzled::Item_result_field::set_result_field ( Field field)
inlinevirtualinherited

Sets field of temporary table for Item which can be switched on temporary table during query processing (grouping and so on)

Reimplemented from drizzled::Item.

Definition at line 48 of file bin_string.h.

bool drizzled::Item_in_subselect::setup_engine ( )
inherited

Try to create an engine to compute the subselect via materialization, and if this fails, revert to execution via the IN=>EXISTS transformation.

The purpose of this method is to hide the implementation details
of this Item's execution. The method creates a new engine for
materialized execution, and initializes the engine.

If this initialization fails
- either because it wasn't possible to create the needed temporary table
  and its index,
- or because of a memory allocation error,
then we revert back to execution via the IN=>EXISTS tranformation.

The initialization of the new engine is divided in two parts - a permanent
one that lives across prepared statements, and one that is repeated for each
execution.
Returns:
Return values:
truememory allocation error occurred
falsean execution method was chosen successfully

Definition at line 1740 of file subselect.cc.

References drizzled::subselect_hash_sj_engine::init_permanent(), drizzled::subselect_hash_sj_engine::init_runtime(), drizzled::Item_in_subselect::row_value_in_to_exists_transformer(), and drizzled::Item_in_subselect::single_value_in_to_exists_transformer().

Referenced by drizzled::Join::setup_subquery_materialization().

Item_subselect::trans_res drizzled::Item_in_subselect::single_value_in_to_exists_transformer ( Join join,
const Comp_creator func 
)
inherited

Transofrm an IN predicate into EXISTS via predicate injection.

The transformation injects additional predicates into the subquery (and makes the subquery correlated) as follows.

  • If the subquery has aggregates, GROUP BY, or HAVING, convert to

    SELECT ie FROM ... HAVING subq_having AND trigcond(oe $cmp$ ref_or_null_helper<ie>)

    the addition is wrapped into trigger only when we want to distinguish between NULL and false results.

  • Otherwise (no aggregates/GROUP BY/HAVING) convert it to one of the following:

    = If we don't need to distinguish between NULL and false subquery:

    SELECT 1 FROM ... WHERE (oe $cmp$ ie) AND subq_where

    = If we need to distinguish between those:

    SELECT 1 FROM ... WHERE subq_where AND trigcond((oe $cmp$ ie) OR (ie IS NULL)) HAVING trigcond(<is_not_null_test>(ie))

    Parameters:
    joinJoin object of the subquery (i.e. 'child' join).
    funcSubquery comparison creator
    Return values:
    RES_OKEither subquery was transformed, or appopriate predicates where injected into it.
    RES_REDUCEThe subquery was reduced to non-subquery
    RES_ERRORError

Definition at line 1168 of file subselect.cc.

References drizzled::in_additional_cond, drizzled::Item::maybe_null, drizzled::Item::name, and drizzled::Join::select_lex.

Referenced by drizzled::Item_in_subselect::setup_engine().

void drizzled::Item::split_sum_func ( Session session,
Item **  ref_pointer_array,
List< Item > &  fields,
Item **  ref,
bool  skip_registered 
)
inherited

Move SUM items out from item tree and replace with reference.

Parameters:
sessionThread handler
ref_pointer_arrayPointer to array of reference fields
fieldsAll fields in select
refPointer to item
skip_registered<=> function be must skipped for registered SUM items
Note:
This is from split_sum_func() for items that should be split

All found SUM items are added FIRST in the fields list and we replace the item with a reference.

session->fatal_error() may be called if we are out of memory

Definition at line 716 of file item.cc.

References drizzled::Item::name, and drizzled::Item::used_tables().

Field * drizzled::Item::tmp_table_field_from_field_type ( Table table,
bool  fixed_length 
)
inherited

Create a field based on field_type of argument.

For now, this is only used to create a field for IFNULL(x,something) and time functions

Return values:
NULLerror
\::Created field

Definition at line 1124 of file item.cc.

References drizzled::Item::make_string_field(), drizzled::Item::maybe_null, and drizzled::Item::name.

Referenced by drizzled::create_tmp_field_from_item().

void drizzled::Item_in_subselect::top_level_item ( void  )
inlinevirtualinherited

Inform the item that there will be no distinction between its result being false or NULL.

Note:

This function will be called for eg. Items that are top-level AND-parts of the WHERE clause. Items implementing this function (currently Item_cond_and and subquery-related item) enable special optimizations when they are "top level".

Reimplemented from drizzled::Item.

Definition at line 352 of file subselect.h.

Item * drizzled::Item::transform ( Item_transformer  transformer,
unsigned char *  arg 
)
virtualinherited

Traverse item tree possibly transforming it (replacing items).

If you don't need to transform an item tree, but only traverse it, please use Item::walk() instead.

Parameters:
transformerfunctor that performs transformation of a subtree
argopaque argument passed to the functor
Returns:
Returns pointer to the new subtree root. Session::change_item_tree() should be called for it if transformation took place, i.e. if a pointer to newly allocated item is returned.

Reimplemented in drizzled::Item_equal, drizzled::Item_cond, drizzled::Item_in_optimizer, drizzled::Item_func, drizzled::Item_row, drizzled::Item_func_make_set, and drizzled::Item_default_value.

Definition at line 387 of file item.cc.

Referenced by drizzled::Item_default_value::transform(), drizzled::Item_func_make_set::transform(), drizzled::Item_row::transform(), drizzled::Item_func::transform(), and drizzled::Item_in_optimizer::transform().

void drizzled::Item_in_subselect::update_null_value ( )
inlinevirtualinherited

Make sure the null_value member has a correct value.

Reimplemented from drizzled::Item.

Definition at line 350 of file subselect.h.

References drizzled::Item_in_subselect::val_bool().

table_map drizzled::Item_subselect::used_tables ( ) const
virtualinherited

Returns bit map of tables used by item

Reimplemented from drizzled::Item_result_field.

Definition at line 378 of file subselect.cc.

bool drizzled::Item_in_subselect::val_bool ( )
virtualinherited

Return boolean value of item.

Return values:
false value is false or NULL true value is true (not equal to 0)
Todo:
Make this functions class dependent

Reimplemented from drizzled::Item_exists_subselect.

Definition at line 913 of file subselect.cc.

References drizzled::Item::fixed, and drizzled::Item::null_value.

Referenced by drizzled::Item_in_subselect::update_null_value().

type::Decimal * drizzled::Item_in_subselect::val_decimal ( type::Decimal decimal_buffer)
virtualinherited

Return decimal representation of item with fixed point.

Parameters:
bufferwhich can be used by Item for returning value (but can be not)
Note:

Returned value should not be changed if it is not the same which was passed via argument.

Return values:
Return pointer on type::Decimal (it can be other then passed via argument) if value is not NULL (null_value flag will be reset to false). In case of NULL value it return 0 pointer and set null_value flag to true.

Reimplemented from drizzled::Item_exists_subselect.

Definition at line 933 of file subselect.cc.

References drizzled::Item::fixed, and drizzled::Item::null_value.

int64_t drizzled::Item_in_subselect::val_int ( )
virtualinherited

Returns integer representation of item.

Return values:
In case of NULL value return 0 and set null_value flag to true. If value is not null null_value flag will be reset to false.

Reimplemented from drizzled::Item_exists_subselect.

Definition at line 868 of file subselect.cc.

References drizzled::Item::fixed, and drizzled::Item::null_value.

int64_t drizzled::Item::val_int_endpoint ( bool  left_endp,
bool *  incl_endp 
)
virtualinherited

Converts "func_arg $CMP$ const" half-interval into "FUNC(func_arg) $CMP2$ const2"

left_endp false <=> The interval is "x < const" or "x <= const" true <=> The interval is "x > const" or "x >= const"

incl_endp IN true <=> the comparison is '<' or '>' false <=> the comparison is '<=' or '>=' OUT The same but for the "F(x) $CMP$ F(const)" comparison

This function is defined only for unary monotonic functions. The caller supplies the source half-interval

x $CMP$ const

The value of const is supplied implicitly as the value this item's argument, the form of $CMP$ comparison is specified through the function's arguments. The calle returns the result interval

F(x) $CMP2$ F(const)

passing back F(const) as the return value, and the form of $CMP2$ through the out parameter. NULL values are assumed to be comparable and be less than any non-NULL values.

Return values:
The output range bound, which equal to the value of val_int()
  • If the value of the function is NULL then the bound is the smallest possible value of INT64_MIN

Reimplemented in drizzled::Item_field, drizzled::Item_func_to_days, and drizzled::Item_func_year.

Definition at line 88 of file item.cc.

double drizzled::Item_in_subselect::val_real ( )
virtualinherited

Returns double precision floating point representation of item.

Return values:
In case of NULL value return 0.0 and set null_value flag to true. If value is not null null_value flag will be reset to false.

Reimplemented from drizzled::Item_exists_subselect.

Definition at line 847 of file subselect.cc.

References drizzled::Item::fixed, and drizzled::Item::null_value.

String * drizzled::Item_in_subselect::val_str ( String str)
virtualinherited

Return string representation of this item object.

Parameters:
anallocated buffer this or any nested Item object can use to store return value of this method.
Note:

Buffer passed via argument should only be used if the item itself doesn't have an own String buffer. In case when the item maintains it's own string buffer, it's preferable to return it instead to minimize number of mallocs/memcpys.

The caller of this method can modify returned string, but only in case when it was allocated on heap, (is_alloced() is true). This allows the caller to efficiently use a buffer allocated by a child without having to allocate a buffer of it's own. The buffer, given to val_str() as argument, belongs to the caller and is later used by the caller at it's own choosing.

A few implications from the above:

  • unless you return a string object which only points to your buffer but doesn't manages it you should be ready that it will be modified.
  • even for not allocated strings (is_alloced() == false) the caller can change charset (see Item_func_{typecast/binary}. XXX: is this a bug?
  • still you should try to minimize data copying and return internal object whenever possible.
Return values:
Incase of NULL value return 0 (NULL pointer) and set null_value flag to true. If value is not null null_value flag will be reset to false.

Reimplemented from drizzled::Item_exists_subselect.

Definition at line 888 of file subselect.cc.

References drizzled::Item::fixed, and drizzled::Item::null_value.

uint64_t drizzled::Item::val_uint ( )
inlineinherited

This is just a shortcut to avoid the cast. You should still use unsigned_flag to check the sign of the item.

Definition at line 309 of file item.h.


Member Data Documentation

Item_result drizzled::Item::cmp_context
inherited
bool drizzled::Item::fixed
inherited

If item fixed with fix_fields

Definition at line 120 of file item.h.

Referenced by drizzled::add_ref_to_table_cond(), drizzled::statement::Kill::execute(), drizzled::find_order_in_list(), drizzled::Item_default_value::fix_fields(), drizzled::Item_insert_value::fix_fields(), drizzled::Item_field::fix_fields(), drizzled::Item_ref::fix_fields(), drizzled::Item_field::fix_outer_field(), drizzled::Item_func_from_days::get_temporal(), drizzled::Item_func_last_day::get_temporal(), drizzled::Item_ref::is_null(), drizzled::Item_float::Item_float(), drizzled::Item_int::Item_int(), drizzled::Join::prepare(), drizzled::Item_in_subselect::row_value_in_to_exists_transformer(), drizzled::Item_in_subselect::select_in_like_transformer(), drizzled::Item_sum_distinct::setup(), drizzled::simplify_joins(), drizzled::Item_ref_null_helper::val_bool(), drizzled::Item_ref::val_bool(), drizzled::Item_exists_subselect::val_bool(), drizzled::Item_in_subselect::val_bool(), drizzled::Item_cache_decimal::val_decimal(), drizzled::Item_cache_real::val_decimal(), drizzled::Item_cache_int::val_decimal(), drizzled::Item_cache_str::val_decimal(), drizzled::Item_real_func::val_decimal(), drizzled::Item_func_get_user_var::val_decimal(), drizzled::Item_func_min_max::val_decimal(), drizzled::Item_ref_null_helper::val_decimal(), drizzled::Item_func_numhybrid::val_decimal(), drizzled::Item_float::val_decimal(), drizzled::Item_func_set_user_var::val_decimal(), drizzled::Item_time::val_decimal(), drizzled::function::cast::Time::val_decimal(), drizzled::Item_date::val_decimal(), drizzled::Item_date_func::val_decimal(), drizzled::Item_date_typecast::val_decimal(), drizzled::Item_func::val_decimal(), drizzled::Item_datetime_typecast::val_decimal(), drizzled::Item_exists_subselect::val_decimal(), drizzled::Item_in_subselect::val_decimal(), drizzled::Item_sum_avg::val_decimal(), drizzled::Item_func_dayofyear::val_int(), drizzled::Item_func_hour::val_int(), drizzled::Item_func_microsecond::val_int(), drizzled::Item_func_minute::val_int(), drizzled::Item_func_month::val_int(), drizzled::Item_func_period_add::val_int(), drizzled::Item_func_period_diff::val_int(), drizzled::Item_func_quarter::val_int(), drizzled::Item_func_second::val_int(), drizzled::Item_func_to_days::val_int(), drizzled::Item_func_year::val_int(), drizzled::Item_func_dayofmonth::val_int(), drizzled::Item_func_from_unixtime::val_int(), drizzled::Item_func_row_count::val_int(), drizzled::Item_func_elt::val_int(), drizzled::Item_func_found_rows::val_int(), drizzled::Item_cache_decimal::val_int(), drizzled::Item_func_unix_timestamp::val_int(), drizzled::Item_func_weekday::val_int(), drizzled::Item_func_sign::val_int(), drizzled::Item_func_last_insert_id::val_int(), drizzled::Item_func_int_div::val_int(), drizzled::Item_func_ord::val_int(), drizzled::Item_cache_real::val_int(), drizzled::Item_extract::val_int(), drizzled::Item_func_field::val_int(), drizzled::Item_cache_int::val_int(), drizzled::Item_cache_str::val_int(), drizzled::Item_func_locate::val_int(), drizzled::Item_func_find_in_set::val_int(), drizzled::Item_time::val_int(), drizzled::utility_functions::BitCount::val_int(), drizzled::utility_functions::GlobalReadLock::val_int(), drizzled::function::bit::Or::val_int(), drizzled::Item_real_func::val_int(), drizzled::Item_func_makedate::val_int(), drizzled::Item_date::val_int(), drizzled::Item_func_sysdate_local::val_int(), drizzled::Item_date_add_interval::val_int(), drizzled::Item_null::val_int(), drizzled::Item_func_min_max::val_int(), drizzled::Item_func_get_user_var::val_int(), drizzled::Item_ref_null_helper::val_int(), drizzled::Item_func_now::val_int(), drizzled::function::bit::And::val_int(), drizzled::Item_float::val_int(), drizzled::Item_func_numhybrid::val_int(), drizzled::Item_func_set_user_var::val_int(), drizzled::function::bit::ShiftLeft::val_int(), drizzled::Item_int::val_int(), drizzled::function::cast::Time::val_int(), drizzled::function::bit::ShiftRight::val_int(), drizzled::Item_field::val_int(), drizzled::Item_ref::val_int(), drizzled::function::bit::Neg::val_int(), drizzled::function::bit::Xor::val_int(), drizzled::Item_string::val_int(), drizzled::Item_date_typecast::val_int(), drizzled::Item_datetime_typecast::val_int(), drizzled::Item_singlerow_subselect::val_int(), drizzled::Item_exists_subselect::val_int(), drizzled::Item_in_subselect::val_int(), drizzled::Item_sum_num::val_int(), drizzled::Item_sum_sum::val_int(), drizzled::Item_sum_count::val_int(), drizzled::Item_sum_count_distinct::val_int(), drizzled::Item_func_in::val_int(), drizzled::Item_func_isnull::val_int(), drizzled::Item_is_not_null_test::val_int(), drizzled::Item_func_isnotnull::val_int(), drizzled::Item_func_like::val_int(), drizzled::Item_cond_and::val_int(), drizzled::Item_cond_or::val_int(), drizzled::Item_cond_xor::val_int(), drizzled::Item_func_year::val_int_endpoint(), drizzled::Item_func_to_days::val_int_endpoint(), drizzled::Item_func_elt::val_real(), drizzled::Item_cache_decimal::val_real(), drizzled::Item_func_units::val_real(), drizzled::Item_func_atan::val_real(), drizzled::Item_func_acos::val_real(), drizzled::Item_func_exp::val_real(), drizzled::Item_func_log::val_real(), drizzled::Item_func_ln::val_real(), drizzled::Item_func_sin::val_real(), drizzled::Item_func_cos::val_real(), drizzled::Item_func_tan::val_real(), drizzled::Item_func_asin::val_real(), drizzled::Item_func_pow::val_real(), drizzled::Item_func_sqrt::val_real(), drizzled::Item_cache_real::val_real(), drizzled::Item_hex_string::val_real(), drizzled::Item_func_month::val_real(), drizzled::Item_uint::val_real(), drizzled::Item_func_weekday::val_real(), drizzled::Item_cache_str::val_real(), drizzled::Item_cache_int::val_real(), drizzled::Item_func_sysdate_local::val_real(), drizzled::Item_int_func::val_real(), drizzled::Item_func_log2::val_real(), drizzled::Item_null::val_real(), drizzled::Item_func_min_max::val_real(), drizzled::Item_ref_null_helper::val_real(), drizzled::Item_func_get_user_var::val_real(), drizzled::Item_float::val_real(), drizzled::Item_func_numhybrid::val_real(), drizzled::Item_func_set_user_var::val_real(), drizzled::Item_func_log10::val_real(), drizzled::Item_int::val_real(), drizzled::Item_ref::val_real(), drizzled::Item_field::val_real(), drizzled::Item_string::val_real(), drizzled::Item_singlerow_subselect::val_real(), drizzled::Item_exists_subselect::val_real(), drizzled::Item_in_subselect::val_real(), drizzled::Item_sum_int::val_real(), drizzled::Item_sum_sum::val_real(), drizzled::Item_sum_avg::val_real(), drizzled::Item_sum_std::val_real(), drizzled::Item_func_set_collation::val_str(), drizzled::Item_func_makedate::val_str(), drizzled::Item_func_collation::val_str(), drizzled::Item_func_conv::val_str(), drizzled::Item_func_dayname::val_str(), drizzled::Item_func_left::val_str(), drizzled::Item_func_binary::val_str(), drizzled::Item_func_right::val_str(), drizzled::Item_func_from_unixtime::val_str(), drizzled::Item_cache_decimal::val_str(), drizzled::Item_func_elt::val_str(), drizzled::Item_func_quote::val_str(), drizzled::Item_func_char::val_str(), drizzled::Item_uint::val_str(), drizzled::utility_functions::Schema::val_str(), drizzled::Item_cache_real::val_str(), drizzled::Item_str_conv::val_str(), drizzled::Item_func_trim::val_str(), drizzled::Item_typecast::val_str(), drizzled::Item_time::val_str(), drizzled::Item_func_weekday::val_str(), drizzled::utility_functions::Catalog::val_str(), drizzled::Item_func_rpad::val_str(), drizzled::Item_cache_int::val_str(), drizzled::utility_functions::User::val_str(), drizzled::Item_date_add_interval::val_str(), drizzled::utility_functions::GlobalReadLock::val_str(), drizzled::Item_real_func::val_str(), drizzled::Item_cache_str::val_str(), drizzled::utility_functions::ResultType::val_str(), drizzled::Item_func_repeat::val_str(), drizzled::Item_func_replace::val_str(), drizzled::Item_date::val_str(), drizzled::utility_functions::Typeof::val_str(), drizzled::Item_hex_string::val_str(), drizzled::Item_func_make_set::val_str(), drizzled::Item_func_insert::val_str(), drizzled::function::cast::Time::val_str(), drizzled::Item_int_func::val_str(), drizzled::Item_func_sysdate_local::val_str(), drizzled::Item_null::val_str(), drizzled::Item_func_min_max::val_str(), drizzled::Item_ref_null_helper::val_str(), drizzled::Item_func_get_user_var::val_str(), drizzled::Item_func_now::val_str(), drizzled::Item_func_ltrim::val_str(), drizzled::Item_float::val_str(), drizzled::Item_func_numhybrid::val_str(), drizzled::Item_func_set_user_var::val_str(), drizzled::Item_func_lpad::val_str(), drizzled::Item_func_monthname::val_str(), drizzled::Item_func_rtrim::val_str(), drizzled::Item_int::val_str(), drizzled::Item_func_conv_charset::val_str(), drizzled::Item_field::val_str(), drizzled::Item_ref::val_str(), drizzled::Item_char_typecast::val_str(), drizzled::Item_string::val_str(), drizzled::Item_date_typecast::val_str(), drizzled::Item_datetime_typecast::val_str(), drizzled::Item_exists_subselect::val_str(), drizzled::Item_in_subselect::val_str(), and drizzled::Item_func_group_concat::val_str().

bool drizzled::Item::is_autogenerated_name
inherited

indicates whether name of this Item was autogenerated or set by user

Definition at line 136 of file item.h.

Referenced by drizzled::Create_func_arg1::create(), drizzled::Create_func_arg2::create(), and drizzled::Create_func_arg3::create().

uint32_t drizzled::Item::name_length
inherited

Length of name

Definition at line 113 of file item.h.

bool drizzled::Item::null_value
inherited

True if item is null

Definition at line 122 of file item.h.

Referenced by drizzled::Item_func_abs::decimal_op(), drizzled::Item_func_plus::decimal_op(), drizzled::Item_func_floor::decimal_op(), drizzled::Item_func_ceiling::decimal_op(), drizzled::Item_func_minus::decimal_op(), drizzled::Item_func_neg::decimal_op(), drizzled::field_is_equal_to_item(), drizzled::Item_func_from_unixtime::get_date(), drizzled::Item_date_add_interval::get_date(), drizzled::Item_ref_null_helper::get_date(), drizzled::Item_direct_ref::get_date(), drizzled::Item_ref::get_date(), drizzled::Item_field::get_date(), drizzled::Item_func_from_days::get_temporal(), drizzled::Item_func_last_day::get_temporal(), drizzled::Item_field::get_time(), drizzled::Item_date_typecast::get_time(), drizzled::TemporalInterval::initFromItem(), drizzled::Item_func_abs::int_op(), drizzled::Item_func_ceiling::int_op(), drizzled::Item_func_floor::int_op(), drizzled::Item_func_plus::int_op(), drizzled::Item_func_minus::int_op(), drizzled::Item_func_neg::int_op(), drizzled::Item_row::is_null(), drizzled::Item_copy_string::is_null(), drizzled::Item_func_numhybrid::is_null(), drizzled::Item_subselect::is_null(), drizzled::Item_func::is_null(), drizzled::Item_sum::is_null(), drizzled::Item_avg_field::is_null(), drizzled::Item_variance_field::is_null(), drizzled::SortParam::make_sortkey(), drizzled::Item_func_abs::real_op(), drizzled::Item_func_plus::real_op(), drizzled::Item_func_ceiling::real_op(), drizzled::Item_func_floor::real_op(), drizzled::Item_func_minus::real_op(), drizzled::Item_func_neg::real_op(), drizzled::Item_field::save_org_in_field(), drizzled::Item::send(), drizzled::Item_sum_distinct::setup(), drizzled::string_functions::Regex::val_bool(), drizzled::Item_direct_ref::val_bool(), drizzled::Item_ref_null_helper::val_bool(), drizzled::utility_functions::Execute::val_bool(), drizzled::Item_ref::val_bool(), drizzled::Item_singlerow_subselect::val_bool(), drizzled::Item_in_subselect::val_bool(), drizzled::Item_real_func::val_decimal(), drizzled::Item_decimal_typecast::val_decimal(), drizzled::Item_func_min_max::val_decimal(), drizzled::Item_func_get_user_var::val_decimal(), drizzled::Item_direct_ref::val_decimal(), drizzled::Item_ref_null_helper::val_decimal(), drizzled::Item_func_set_user_var::val_decimal(), drizzled::Item_copy_string::val_decimal(), drizzled::Item_ref::val_decimal(), drizzled::Item_field::val_decimal(), drizzled::Item_singlerow_subselect::val_decimal(), drizzled::Item_in_subselect::val_decimal(), drizzled::Item_sum_distinct::val_decimal(), drizzled::Item_sum_avg::val_decimal(), drizzled::Item_func_if::val_decimal(), drizzled::Item_func_case::val_decimal(), drizzled::Item_func_dayofyear::val_int(), drizzled::Item_func_hour::val_int(), drizzled::Item_func_microsecond::val_int(), drizzled::Item_func_minute::val_int(), drizzled::Item_func_month::val_int(), drizzled::Item_func_period_add::val_int(), drizzled::Item_func_period_diff::val_int(), drizzled::Item_func_quarter::val_int(), drizzled::Item_func_second::val_int(), drizzled::Item_func_to_days::val_int(), drizzled::Item_func_year::val_int(), drizzled::Item_func_dayofmonth::val_int(), drizzled::Item_func_elt::val_int(), drizzled::Item_func_last_insert_id::val_int(), drizzled::Item_func_int_div::val_int(), drizzled::Item_func_ord::val_int(), drizzled::Item_func_unix_timestamp::val_int(), drizzled::Item_func_weekday::val_int(), drizzled::Item_func_sign::val_int(), drizzled::Item_func_timestamp_diff::val_int(), user_locks::GetLock::val_int(), user_locks::GetLocks::val_int(), user_locks::IsFreeLock::val_int(), user_locks::IsUsedLock::val_int(), user_locks::ReleaseLock::val_int(), drizzled::Item_func_field::val_int(), user_locks::barriers::Wait::val_int(), drizzled::Item_extract::val_int(), user_locks::barriers::Release::val_int(), user_locks::barriers::WaitUntil::val_int(), user_locks::barriers::CreateBarrier::val_int(), user_locks::locks::ReleaseAndWait::val_int(), user_locks::barriers::Signal::val_int(), user_locks::locks::WaitFor::val_int(), drizzled::Item_func_locate::val_int(), plugin::catalog::functions::Create::val_int(), plugin::catalog::functions::Lock::val_int(), plugin::catalog::functions::Drop::val_int(), plugin::catalog::functions::Unlock::val_int(), drizzled::Item_func_find_in_set::val_int(), drizzled::function::cast::Unsigned::val_int(), drizzled::utility_functions::BitCount::val_int(), drizzled::function::bit::Or::val_int(), drizzled::function::cast::Signed::val_int(), drizzled::utility_functions::GlobalReadLock::val_int(), drizzled::Item_decimal_typecast::val_int(), drizzled::Item_func_makedate::val_int(), drizzled::Item_null::val_int(), drizzled::Item_func_min_max::val_int(), drizzled::Item_func_get_user_var::val_int(), drizzled::Item_direct_ref::val_int(), drizzled::Item_ref_null_helper::val_int(), drizzled::function::bit::And::val_int(), drizzled::Item_func_set_user_var::val_int(), drizzled::Item_copy_string::val_int(), drizzled::function::bit::ShiftLeft::val_int(), drizzled::function::bit::ShiftRight::val_int(), drizzled::Item_ref::val_int(), drizzled::Item_field::val_int(), drizzled::function::bit::Neg::val_int(), drizzled::function::bit::Xor::val_int(), drizzled::Item_date_typecast::val_int(), drizzled::Item_datetime_typecast::val_int(), drizzled::Item_singlerow_subselect::val_int(), drizzled::Item_in_subselect::val_int(), drizzled::Item_func_interval::val_int(), drizzled::Item_func_if::val_int(), drizzled::Item_func_case::val_int(), drizzled::Item_func_in::val_int(), drizzled::Item_func_like::val_int(), drizzled::Item_equal::val_int(), drizzled::Item_cond_and::val_int(), drizzled::Item_cond_or::val_int(), drizzled::Item_cond_xor::val_int(), drizzled::Item_func_to_days::val_int_endpoint(), drizzled::Item_field::val_int_endpoint(), drizzled::Item_func_elt::val_real(), drizzled::Item_func_sin::val_real(), drizzled::Item_func_sqrt::val_real(), drizzled::Item_func_atan::val_real(), drizzled::Item_func_exp::val_real(), drizzled::Item_func_ln::val_real(), drizzled::Item_func_asin::val_real(), drizzled::Item_func_tan::val_real(), drizzled::Item_func_pow::val_real(), drizzled::Item_func_cos::val_real(), drizzled::Item_func_log::val_real(), drizzled::Item_func_units::val_real(), drizzled::Item_func_acos::val_real(), drizzled::Item_decimal_typecast::val_real(), drizzled::Item_null::val_real(), drizzled::Item_func_log2::val_real(), drizzled::Item_func_min_max::val_real(), drizzled::Item_ref_null_helper::val_real(), drizzled::Item_func_get_user_var::val_real(), drizzled::Item_direct_ref::val_real(), drizzled::Item_copy_string::val_real(), drizzled::Item_func_set_user_var::val_real(), drizzled::Item_func_log10::val_real(), drizzled::Item_ref::val_real(), drizzled::Item_field::val_real(), drizzled::Item_singlerow_subselect::val_real(), drizzled::Item_in_subselect::val_real(), drizzled::Item_sum_avg::val_real(), drizzled::Item_func_if::val_real(), drizzled::Item_variance_field::val_real(), drizzled::Item_func_case::val_real(), drizzled::Item_func_makedate::val_str(), drizzled::Item_func_collation::val_str(), drizzled::Item_func_set_collation::val_str(), drizzled::Item_func_left::val_str(), drizzled::Item_func_right::val_str(), drizzled::Item_func_binary::val_str(), drizzled::Item_func_dayname::val_str(), drizzled::Item_func_conv::val_str(), drizzled::Item_func_elt::val_str(), drizzled::Item_func_quote::val_str(), drizzled::Item_func_char::val_str(), drizzled::Item_func_month::val_str(), drizzled::Item_str_conv::val_str(), drizzled::utility_functions::Schema::val_str(), drizzled::Item_func_trim::val_str(), drizzled::Item_typecast::val_str(), drizzled::Item_func_weekday::val_str(), drizzled::Item_func_rpad::val_str(), drizzled::utility_functions::ResultType::val_str(), drizzled::utility_functions::GlobalReadLock::val_str(), drizzled::Item_decimal_typecast::val_str(), drizzled::utility_functions::User::val_str(), drizzled::Item_real_func::val_str(), drizzled::function::cast::Boolean::val_str(), drizzled::Item_func_repeat::val_str(), drizzled::utility_functions::Typeof::val_str(), drizzled::Item_func_replace::val_str(), drizzled::Item_func_make_set::val_str(), drizzled::Item_func_insert::val_str(), drizzled::Item_int_func::val_str(), drizzled::function::cast::Time::val_str(), drizzled::Item_null::val_str(), drizzled::Item_func_min_max::val_str(), drizzled::Item_ref_null_helper::val_str(), drizzled::Item_direct_ref::val_str(), drizzled::Item_func_get_user_var::val_str(), drizzled::Item_func_ltrim::val_str(), drizzled::Item_func_numhybrid::val_str(), drizzled::Item_func_set_user_var::val_str(), drizzled::Item_func_lpad::val_str(), drizzled::Item_func_monthname::val_str(), drizzled::Item_func_rtrim::val_str(), drizzled::Item_copy_string::val_str(), drizzled::Item_func_conv_charset::val_str(), drizzled::Item_field::val_str(), drizzled::Item_ref::val_str(), drizzled::Item_char_typecast::val_str(), drizzled::Item_date_typecast::val_str(), drizzled::Item_datetime_typecast::val_str(), drizzled::Item_singlerow_subselect::val_str(), drizzled::Item_in_subselect::val_str(), drizzled::Item_sum_distinct::val_str(), drizzled::Item_func_if::val_str(), and drizzled::Item_func_group_concat::val_str().

String drizzled::Item::str_value
inherited
bool drizzled::Item::with_subselect
inherited

If this item is a subselect or some of its arguments is or contains a subselect. Computed by fix_fields.

Definition at line 142 of file item.h.

Referenced by drizzled::remove_constants(), drizzled::Item_is_not_null_test::update_used_tables(), drizzled::Item_func_isnull::val_int(), and drizzled::Item_is_not_null_test::val_int().


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