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item_cmpfunc.h
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item_cmpfunc.h
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#ifndef ITEM_CMPFUNC_INCLUDED
#define ITEM_CMPFUNC_INCLUDED
/* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
Copyright (c) 2009, 2011, Monty Program Ab.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
/* compare and test functions */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
#include "thr_malloc.h" /* sql_calloc */
#include "item_func.h" /* Item_int_func, Item_bool_func */
#define PCRE_STATIC 1 /* Important on Windows */
#include "pcre.h" /* pcre header file */
extern Item_result item_cmp_type(Item_result a,Item_result b);
class Item_bool_func2;
class Arg_comparator;
typedef int (Arg_comparator::*arg_cmp_func)();
typedef int (*Item_field_cmpfunc)(Item *f1, Item *f2, void *arg);
class Arg_comparator: public Sql_alloc
{
Item **a, **b;
arg_cmp_func func;
Item_func_or_sum *owner;
bool set_null; // TRUE <=> set owner->null_value
Arg_comparator *comparators; // used only for compare_row()
double precision;
/* Fields used in DATE/DATETIME comparison. */
THD *thd;
Item *a_cache, *b_cache; // Cached values of a and b items
// when one of arguments is NULL.
int set_compare_func(Item_func_or_sum *owner, Item_result type);
inline int set_compare_func(Item_func_or_sum *owner_arg)
{
return set_compare_func(owner_arg, item_cmp_type((*a)->result_type(),
(*b)->result_type()));
}
bool agg_arg_charsets_for_comparison();
public:
DTCollation cmp_collation;
/* Allow owner function to use string buffers. */
String value1, value2;
Arg_comparator(): set_null(TRUE), comparators(0), thd(0),
a_cache(0), b_cache(0) {};
Arg_comparator(Item **a1, Item **a2): a(a1), b(a2), set_null(TRUE),
comparators(0), thd(0), a_cache(0), b_cache(0) {};
private:
int set_cmp_func(Item_func_or_sum *owner_arg,
Item **a1, Item **a2,
Item_result type);
public:
inline int set_cmp_func(Item_func_or_sum *owner_arg,
Item **a1, Item **a2, bool set_null_arg)
{
set_null= set_null_arg;
return set_cmp_func(owner_arg, a1, a2,
item_cmp_type((*a1)->cmp_type(),
(*a2)->cmp_type()));
}
inline int compare() { return (this->*func)(); }
int compare_string(); // compare args[0] & args[1]
int compare_binary_string(); // compare args[0] & args[1]
int compare_real(); // compare args[0] & args[1]
int compare_decimal(); // compare args[0] & args[1]
int compare_int_signed(); // compare args[0] & args[1]
int compare_int_signed_unsigned();
int compare_int_unsigned_signed();
int compare_int_unsigned();
int compare_row(); // compare args[0] & args[1]
int compare_e_string(); // compare args[0] & args[1]
int compare_e_binary_string(); // compare args[0] & args[1]
int compare_e_real(); // compare args[0] & args[1]
int compare_e_decimal(); // compare args[0] & args[1]
int compare_e_int(); // compare args[0] & args[1]
int compare_e_int_diff_signedness();
int compare_e_row(); // compare args[0] & args[1]
int compare_real_fixed();
int compare_e_real_fixed();
int compare_datetime(); // compare args[0] & args[1] as DATETIMEs
int compare_e_datetime();
Item** cache_converted_constant(THD *thd, Item **value, Item **cache,
Item_result type);
void set_datetime_cmp_func(Item_func_or_sum *owner_arg,
Item **a1, Item **b1);
static arg_cmp_func comparator_matrix [6][2];
inline bool is_owner_equal_func()
{
return (owner->type() == Item::FUNC_ITEM &&
((Item_func*)owner)->functype() == Item_func::EQUAL_FUNC);
}
void cleanup()
{
delete [] comparators;
comparators= 0;
}
friend class Item_func;
};
class Item_bool_func :public Item_int_func
{
public:
Item_bool_func() :Item_int_func() {}
Item_bool_func(Item *a) :Item_int_func(a) {}
Item_bool_func(Item *a,Item *b) :Item_int_func(a,b) {}
Item_bool_func(Item *a, Item *b, Item *c) :Item_int_func(a, b, c) {}
Item_bool_func(List<Item> &list) :Item_int_func(list) { }
Item_bool_func(THD *thd, Item_bool_func *item) :Item_int_func(thd, item) {}
bool is_bool_type() { return true; }
void fix_length_and_dec() { decimals=0; max_length=1; }
uint decimal_precision() const { return 1; }
virtual bool can_optimize_group_min_max(Item_field *min_max_arg_item,
const Item *const_item) const
{
return false;
}
};
/**
Abstract Item class, to represent <code>X IS [NOT] (TRUE | FALSE)</code>
boolean predicates.
*/
class Item_func_truth : public Item_bool_func
{
public:
virtual bool val_bool();
virtual longlong val_int();
virtual void fix_length_and_dec();
virtual void print(String *str, enum_query_type query_type);
protected:
Item_func_truth(Item *a, bool a_value, bool a_affirmative)
: Item_bool_func(a), value(a_value), affirmative(a_affirmative)
{}
~Item_func_truth()
{}
private:
/**
True for <code>X IS [NOT] TRUE</code>,
false for <code>X IS [NOT] FALSE</code> predicates.
*/
const bool value;
/**
True for <code>X IS Y</code>, false for <code>X IS NOT Y</code> predicates.
*/
const bool affirmative;
};
/**
This Item represents a <code>X IS TRUE</code> boolean predicate.
*/
class Item_func_istrue : public Item_func_truth
{
public:
Item_func_istrue(Item *a) : Item_func_truth(a, true, true) {}
~Item_func_istrue() {}
virtual const char* func_name() const { return "istrue"; }
};
/**
This Item represents a <code>X IS NOT TRUE</code> boolean predicate.
*/
class Item_func_isnottrue : public Item_func_truth
{
public:
Item_func_isnottrue(Item *a) : Item_func_truth(a, true, false) {}
~Item_func_isnottrue() {}
virtual const char* func_name() const { return "isnottrue"; }
};
/**
This Item represents a <code>X IS FALSE</code> boolean predicate.
*/
class Item_func_isfalse : public Item_func_truth
{
public:
Item_func_isfalse(Item *a) : Item_func_truth(a, false, true) {}
~Item_func_isfalse() {}
virtual const char* func_name() const { return "isfalse"; }
};
/**
This Item represents a <code>X IS NOT FALSE</code> boolean predicate.
*/
class Item_func_isnotfalse : public Item_func_truth
{
public:
Item_func_isnotfalse(Item *a) : Item_func_truth(a, false, false) {}
~Item_func_isnotfalse() {}
virtual const char* func_name() const { return "isnotfalse"; }
};
class Item_cache;
#define UNKNOWN (-1)
/*
Item_in_optimizer(left_expr, Item_in_subselect(...))
Item_in_optimizer is used to wrap an instance of Item_in_subselect. This
class does the following:
- Evaluate the left expression and store it in Item_cache_* object (to
avoid re-evaluating it many times during subquery execution)
- Shortcut the evaluation of "NULL IN (...)" to NULL in the cases where we
don't care if the result is NULL or FALSE.
NOTE
It is not quite clear why the above listed functionality should be
placed into a separate class called 'Item_in_optimizer'.
*/
class Item_in_optimizer: public Item_bool_func
{
protected:
Item_cache *cache;
Item *expr_cache;
bool save_cache;
/*
Stores the value of "NULL IN (SELECT ...)" for uncorrelated subqueries:
UNKNOWN - "NULL in (SELECT ...)" has not yet been evaluated
FALSE - result is FALSE
TRUE - result is NULL
*/
int result_for_null_param;
public:
Item_in_optimizer(Item *a, Item *b):
Item_bool_func(a, b), cache(0), expr_cache(0),
save_cache(0), result_for_null_param(UNKNOWN)
{ with_subselect= true; }
bool fix_fields(THD *, Item **);
bool fix_left(THD *thd);
table_map not_null_tables() const { return 0; }
bool is_null();
longlong val_int();
void cleanup();
const char *func_name() const { return "<in_optimizer>"; }
Item_cache **get_cache() { return &cache; }
void keep_top_level_cache();
Item *transform(Item_transformer transformer, uchar *arg);
virtual Item *expr_cache_insert_transformer(uchar *thd_arg);
bool is_expensive_processor(uchar *arg);
bool is_expensive();
void set_join_tab_idx(uint join_tab_idx_arg)
{ args[1]->set_join_tab_idx(join_tab_idx_arg); }
virtual void get_cache_parameters(List<Item> ¶meters);
bool is_top_level_item();
bool eval_not_null_tables(uchar *opt_arg);
void fix_after_pullout(st_select_lex *new_parent, Item **ref);
bool invisible_mode();
void reset_cache() { cache= NULL; }
};
class Comp_creator
{
public:
Comp_creator() {} /* Remove gcc warning */
virtual ~Comp_creator() {} /* Remove gcc warning */
/**
Create operation with given arguments.
*/
virtual Item_bool_func2* create(Item *a, Item *b) const = 0;
/**
Create operation with given arguments in swap order.
*/
virtual Item_bool_func2* create_swap(Item *a, Item *b) const = 0;
virtual const char* symbol(bool invert) const = 0;
virtual bool eqne_op() const = 0;
virtual bool l_op() const = 0;
};
class Eq_creator :public Comp_creator
{
public:
Eq_creator() {} /* Remove gcc warning */
virtual ~Eq_creator() {} /* Remove gcc warning */
virtual Item_bool_func2* create(Item *a, Item *b) const;
virtual Item_bool_func2* create_swap(Item *a, Item *b) const;
virtual const char* symbol(bool invert) const { return invert? "<>" : "="; }
virtual bool eqne_op() const { return 1; }
virtual bool l_op() const { return 0; }
};
class Ne_creator :public Comp_creator
{
public:
Ne_creator() {} /* Remove gcc warning */
virtual ~Ne_creator() {} /* Remove gcc warning */
virtual Item_bool_func2* create(Item *a, Item *b) const;
virtual Item_bool_func2* create_swap(Item *a, Item *b) const;
virtual const char* symbol(bool invert) const { return invert? "=" : "<>"; }
virtual bool eqne_op() const { return 1; }
virtual bool l_op() const { return 0; }
};
class Gt_creator :public Comp_creator
{
public:
Gt_creator() {} /* Remove gcc warning */
virtual ~Gt_creator() {} /* Remove gcc warning */
virtual Item_bool_func2* create(Item *a, Item *b) const;
virtual Item_bool_func2* create_swap(Item *a, Item *b) const;
virtual const char* symbol(bool invert) const { return invert? "<=" : ">"; }
virtual bool eqne_op() const { return 0; }
virtual bool l_op() const { return 0; }
};
class Lt_creator :public Comp_creator
{
public:
Lt_creator() {} /* Remove gcc warning */
virtual ~Lt_creator() {} /* Remove gcc warning */
virtual Item_bool_func2* create(Item *a, Item *b) const;
virtual Item_bool_func2* create_swap(Item *a, Item *b) const;
virtual const char* symbol(bool invert) const { return invert? ">=" : "<"; }
virtual bool eqne_op() const { return 0; }
virtual bool l_op() const { return 1; }
};
class Ge_creator :public Comp_creator
{
public:
Ge_creator() {} /* Remove gcc warning */
virtual ~Ge_creator() {} /* Remove gcc warning */
virtual Item_bool_func2* create(Item *a, Item *b) const;
virtual Item_bool_func2* create_swap(Item *a, Item *b) const;
virtual const char* symbol(bool invert) const { return invert? "<" : ">="; }
virtual bool eqne_op() const { return 0; }
virtual bool l_op() const { return 0; }
};
class Le_creator :public Comp_creator
{
public:
Le_creator() {} /* Remove gcc warning */
virtual ~Le_creator() {} /* Remove gcc warning */
virtual Item_bool_func2* create(Item *a, Item *b) const;
virtual Item_bool_func2* create_swap(Item *a, Item *b) const;
virtual const char* symbol(bool invert) const { return invert? ">" : "<="; }
virtual bool eqne_op() const { return 0; }
virtual bool l_op() const { return 1; }
};
class Item_bool_func2 :public Item_bool_func
{ /* Bool with 2 string args */
protected:
Arg_comparator cmp;
bool abort_on_null;
public:
Item_bool_func2(Item *a,Item *b)
:Item_bool_func(a,b), cmp(tmp_arg, tmp_arg+1),
abort_on_null(FALSE) { sargable= TRUE; }
void fix_length_and_dec();
int set_cmp_func()
{
return cmp.set_cmp_func(this, tmp_arg, tmp_arg+1, TRUE);
}
optimize_type select_optimize() const { return OPTIMIZE_OP; }
virtual enum Functype rev_functype() const { return UNKNOWN_FUNC; }
bool have_rev_func() const { return rev_functype() != UNKNOWN_FUNC; }
virtual inline void print(String *str, enum_query_type query_type)
{
Item_func::print_op(str, query_type);
}
bool is_null() { return MY_TEST(args[0]->is_null() || args[1]->is_null()); }
CHARSET_INFO *compare_collation() const
{ return cmp.cmp_collation.collation; }
void top_level_item() { abort_on_null= TRUE; }
Arg_comparator *get_comparator() { return &cmp; }
void cleanup()
{
Item_bool_func::cleanup();
cmp.cleanup();
}
friend class Arg_comparator;
};
class Item_bool_rowready_func2 :public Item_bool_func2
{
public:
Item_bool_rowready_func2(Item *a, Item *b) :Item_bool_func2(a, b)
{
allowed_arg_cols= 0; // Fetch this value from first argument
}
Item *neg_transformer(THD *thd);
virtual Item *negated_item();
bool subst_argument_checker(uchar **arg)
{
return (*arg != NULL);
}
bool can_optimize_group_min_max(Item_field *min_max_arg_item,
const Item *const_item) const
{
return min_max_arg_item->field->can_optimize_group_min_max(this,
const_item);
}
};
/**
XOR inherits from Item_bool_func2 because it is not optimized yet.
Later, when XOR is optimized, it needs to inherit from
Item_cond instead. See WL#5800.
*/
class Item_func_xor :public Item_bool_func2
{
public:
Item_func_xor(Item *i1, Item *i2) :Item_bool_func2(i1, i2) {}
enum Functype functype() const { return XOR_FUNC; }
const char *func_name() const { return "xor"; }
longlong val_int();
void top_level_item() {}
Item *neg_transformer(THD *thd);
bool subst_argument_checker(uchar **arg)
{
return (*arg != NULL);
}
};
class Item_func_not :public Item_bool_func
{
bool abort_on_null;
public:
Item_func_not(Item *a) :Item_bool_func(a), abort_on_null(FALSE) {}
virtual void top_level_item() { abort_on_null= 1; }
bool is_top_level_item() { return abort_on_null; }
longlong val_int();
enum Functype functype() const { return NOT_FUNC; }
const char *func_name() const { return "not"; }
Item *neg_transformer(THD *thd);
bool fix_fields(THD *, Item **);
virtual void print(String *str, enum_query_type query_type);
};
class Item_maxmin_subselect;
/*
trigcond<param>(arg) ::= param? arg : TRUE
The class Item_func_trig_cond is used for guarded predicates
which are employed only for internal purposes.
A guarded predicate is an object consisting of an a regular or
a guarded predicate P and a pointer to a boolean guard variable g.
A guarded predicate P/g is evaluated to true if the value of the
guard g is false, otherwise it is evaluated to the same value that
the predicate P: val(P/g)= g ? val(P):true.
Guarded predicates allow us to include predicates into a conjunction
conditionally. Currently they are utilized for pushed down predicates
in queries with outer join operations.
In the future, probably, it makes sense to extend this class to
the objects consisting of three elements: a predicate P, a pointer
to a variable g and a firing value s with following evaluation
rule: val(P/g,s)= g==s? val(P) : true. It will allow us to build only
one item for the objects of the form P/g1/g2...
Objects of this class are built only for query execution after
the execution plan has been already selected. That's why this
class needs only val_int out of generic methods.
Current uses of Item_func_trig_cond objects:
- To wrap selection conditions when executing outer joins
- To wrap condition that is pushed down into subquery
*/
class Item_func_trig_cond: public Item_bool_func
{
bool *trig_var;
public:
Item_func_trig_cond(Item *a, bool *f) : Item_bool_func(a) { trig_var= f; }
longlong val_int() { return *trig_var ? args[0]->val_int() : 1; }
enum Functype functype() const { return TRIG_COND_FUNC; };
const char *func_name() const { return "trigcond"; };
bool const_item() const { return FALSE; }
bool *get_trig_var() { return trig_var; }
};
class Item_func_not_all :public Item_func_not
{
/* allow to check presence of values in max/min optimization */
Item_sum_hybrid *test_sum_item;
Item_maxmin_subselect *test_sub_item;
public:
bool show;
Item_func_not_all(Item *a)
:Item_func_not(a), test_sum_item(0), test_sub_item(0),
show(0)
{}
table_map not_null_tables() const { return 0; }
longlong val_int();
enum Functype functype() const { return NOT_ALL_FUNC; }
const char *func_name() const { return "<not>"; }
bool fix_fields(THD *thd, Item **ref)
{return Item_func::fix_fields(thd, ref);}
virtual void print(String *str, enum_query_type query_type);
void set_sum_test(Item_sum_hybrid *item) { test_sum_item= item; test_sub_item= 0; };
void set_sub_test(Item_maxmin_subselect *item) { test_sub_item= item; test_sum_item= 0;};
bool empty_underlying_subquery();
Item *neg_transformer(THD *thd);
};
class Item_func_nop_all :public Item_func_not_all
{
public:
Item_func_nop_all(Item *a) :Item_func_not_all(a) {}
longlong val_int();
const char *func_name() const { return "<nop>"; }
Item *neg_transformer(THD *thd);
};
class Item_func_eq :public Item_bool_rowready_func2
{
public:
Item_func_eq(Item *a,Item *b) :
Item_bool_rowready_func2(a,b), in_equality_no(UINT_MAX)
{}
longlong val_int();
enum Functype functype() const { return EQ_FUNC; }
enum Functype rev_functype() const { return EQ_FUNC; }
cond_result eq_cmp_result() const { return COND_TRUE; }
const char *func_name() const { return "="; }
Item *negated_item();
/*
- If this equality is created from the subquery's IN-equality:
number of the item it was created from, e.g. for
(a,b) IN (SELECT c,d ...) a=c will have in_equality_no=0,
and b=d will have in_equality_no=1.
- Otherwise, UINT_MAX
*/
uint in_equality_no;
virtual uint exists2in_reserved_items() { return 1; };
};
class Item_func_equal :public Item_bool_rowready_func2
{
public:
Item_func_equal(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
longlong val_int();
void fix_length_and_dec();
table_map not_null_tables() const { return 0; }
enum Functype functype() const { return EQUAL_FUNC; }
enum Functype rev_functype() const { return EQUAL_FUNC; }
cond_result eq_cmp_result() const { return COND_TRUE; }
const char *func_name() const { return "<=>"; }
Item *neg_transformer(THD *thd) { return 0; }
};
class Item_func_ge :public Item_bool_rowready_func2
{
public:
Item_func_ge(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
longlong val_int();
enum Functype functype() const { return GE_FUNC; }
enum Functype rev_functype() const { return LE_FUNC; }
cond_result eq_cmp_result() const { return COND_TRUE; }
const char *func_name() const { return ">="; }
Item *negated_item();
};
class Item_func_gt :public Item_bool_rowready_func2
{
public:
Item_func_gt(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
longlong val_int();
enum Functype functype() const { return GT_FUNC; }
enum Functype rev_functype() const { return LT_FUNC; }
cond_result eq_cmp_result() const { return COND_FALSE; }
const char *func_name() const { return ">"; }
Item *negated_item();
};
class Item_func_le :public Item_bool_rowready_func2
{
public:
Item_func_le(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
longlong val_int();
enum Functype functype() const { return LE_FUNC; }
enum Functype rev_functype() const { return GE_FUNC; }
cond_result eq_cmp_result() const { return COND_TRUE; }
const char *func_name() const { return "<="; }
Item *negated_item();
};
class Item_func_lt :public Item_bool_rowready_func2
{
public:
Item_func_lt(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {}
longlong val_int();
enum Functype functype() const { return LT_FUNC; }
enum Functype rev_functype() const { return GT_FUNC; }
cond_result eq_cmp_result() const { return COND_FALSE; }
const char *func_name() const { return "<"; }
Item *negated_item();
};
class Item_func_ne :public Item_bool_rowready_func2
{
public:
Item_func_ne(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {}
longlong val_int();
enum Functype functype() const { return NE_FUNC; }
cond_result eq_cmp_result() const { return COND_FALSE; }
optimize_type select_optimize() const { return OPTIMIZE_KEY; }
const char *func_name() const { return "<>"; }
Item *negated_item();
};
/*
The class Item_func_opt_neg is defined to factor out the functionality
common for the classes Item_func_between and Item_func_in. The objects
of these classes can express predicates or there negations.
The alternative approach would be to create pairs Item_func_between,
Item_func_notbetween and Item_func_in, Item_func_notin.
*/
class Item_func_opt_neg :public Item_bool_func
{
public:
bool negated; /* <=> the item represents NOT <func> */
bool pred_level; /* <=> [NOT] <func> is used on a predicate level */
public:
Item_func_opt_neg(Item *a, Item *b, Item *c)
:Item_bool_func(a, b, c), negated(0), pred_level(0) {}
Item_func_opt_neg(List<Item> &list)
:Item_bool_func(list), negated(0), pred_level(0) {}
public:
inline void negate() { negated= !negated; }
inline void top_level_item() { pred_level= 1; }
Item *neg_transformer(THD *thd)
{
negated= !negated;
return this;
}
bool eq(const Item *item, bool binary_cmp) const;
bool subst_argument_checker(uchar **arg) { return TRUE; }
};
class Item_func_between :public Item_func_opt_neg
{
DTCollation cmp_collation;
public:
Item_result cmp_type;
String value0,value1,value2;
/* TRUE <=> arguments will be compared as dates. */
Item *compare_as_dates;
Item_func_between(Item *a, Item *b, Item *c)
:Item_func_opt_neg(a, b, c), compare_as_dates(FALSE) { sargable= TRUE; }
longlong val_int();
optimize_type select_optimize() const { return OPTIMIZE_KEY; }
enum Functype functype() const { return BETWEEN; }
const char *func_name() const { return "between"; }
bool fix_fields(THD *, Item **);
void fix_length_and_dec();
virtual void print(String *str, enum_query_type query_type);
CHARSET_INFO *compare_collation() const { return cmp_collation.collation; }
bool eval_not_null_tables(uchar *opt_arg);
void fix_after_pullout(st_select_lex *new_parent, Item **ref);
bool count_sargable_conds(uchar *arg);
};
class Item_func_strcmp :public Item_int_func
{
String value1, value2;
DTCollation cmp_collation;
public:
Item_func_strcmp(Item *a,Item *b) :Item_int_func(a,b) {}
longlong val_int();
uint decimal_precision() const { return 1; }
const char *func_name() const { return "strcmp"; }
void fix_length_and_dec()
{
agg_arg_charsets_for_comparison(cmp_collation, args, 2);
fix_char_length(2); // returns "1" or "0" or "-1"
}
};
struct interval_range
{
Item_result type;
double dbl;
my_decimal dec;
};
class Item_func_interval :public Item_int_func
{
Item_row *row;
bool use_decimal_comparison;
interval_range *intervals;
public:
Item_func_interval(Item_row *a)
:Item_int_func(a),row(a),intervals(0)
{
allowed_arg_cols= 0; // Fetch this value from first argument
}
longlong val_int();
void fix_length_and_dec();
const char *func_name() const { return "interval"; }
uint decimal_precision() const { return 2; }
void print(String *str, enum_query_type query_type)
{
str->append(func_name());
print_args(str, 0, query_type);
}
};
class Item_func_coalesce :public Item_func_hybrid_field_type
{
public:
Item_func_coalesce(Item *a, Item *b) :Item_func_hybrid_field_type(a, b) {}
Item_func_coalesce(List<Item> &list) :Item_func_hybrid_field_type(list) {}
double real_op();
longlong int_op();
String *str_op(String *);
my_decimal *decimal_op(my_decimal *);
bool date_op(MYSQL_TIME *ltime,uint fuzzydate);
void fix_length_and_dec();
const char *func_name() const { return "coalesce"; }
table_map not_null_tables() const { return 0; }
};
/*
Case abbreviations that aggregate its result field type by two arguments:
IFNULL(arg1, arg2)
IF(switch, arg1, arg2)
*/
class Item_func_case_abbreviation2 :public Item_func_hybrid_field_type
{
public:
Item_func_case_abbreviation2(Item *a, Item *b)
:Item_func_hybrid_field_type(a, b) { }
Item_func_case_abbreviation2(Item *a, Item *b, Item *c)
:Item_func_hybrid_field_type(a, b, c) { }
void fix_length_and_dec2(Item **args);
uint decimal_precision2(Item **args) const;
};
class Item_func_ifnull :public Item_func_case_abbreviation2
{
public:
Item_func_ifnull(Item *a, Item *b) :Item_func_case_abbreviation2(a,b) {}
double real_op();
longlong int_op();
String *str_op(String *str);
my_decimal *decimal_op(my_decimal *);
bool date_op(MYSQL_TIME *ltime,uint fuzzydate);
void fix_length_and_dec()
{
Item_func_case_abbreviation2::fix_length_and_dec2(args);
maybe_null= args[1]->maybe_null;
}
const char *func_name() const { return "ifnull"; }
Field *tmp_table_field(TABLE *table);
table_map not_null_tables() const { return 0; }
uint decimal_precision() const
{
return Item_func_case_abbreviation2::decimal_precision2(args);
}
};
class Item_func_if :public Item_func_case_abbreviation2
{
public:
Item_func_if(Item *a,Item *b,Item *c)
:Item_func_case_abbreviation2(a, b, c)
{}
bool date_op(MYSQL_TIME *ltime, uint fuzzydate);
longlong int_op();
double real_op();
my_decimal *decimal_op(my_decimal *);
String *str_op(String *);
bool fix_fields(THD *, Item **);
void fix_length_and_dec();
uint decimal_precision() const
{
return Item_func_case_abbreviation2::decimal_precision2(args + 1);
}
const char *func_name() const { return "if"; }
bool eval_not_null_tables(uchar *opt_arg);
void fix_after_pullout(st_select_lex *new_parent, Item **ref);
private:
void cache_type_info(Item *source);
};
class Item_func_nullif :public Item_func_hybrid_field_type
{
Arg_comparator cmp;
/*
Remember the first argument in case it will be substituted by either of:
- convert_const_compared_to_int_field()
- agg_item_set_converter() in set_cmp_func()
- cache_converted_constant() in set_cmp_func()
The original item will be stored in m_arg0_copy, to return result.
The substituted item will be stored in args[0], for comparison purposes.
*/
Item *m_args0_copy;
public:
Item_func_nullif(Item *a,Item *b)
:Item_func_hybrid_field_type(a, b),
m_args0_copy(a)
{}
bool date_op(MYSQL_TIME *ltime, uint fuzzydate);
double real_op();
longlong int_op();
String *str_op(String *str);
my_decimal *decimal_op(my_decimal *);
void fix_length_and_dec();
uint decimal_precision() const { return m_args0_copy->decimal_precision(); }
const char *func_name() const { return "nullif"; }
virtual inline void print(String *str, enum_query_type query_type)
{
Item_func::print(str, query_type);
}
table_map not_null_tables() const { return 0; }
bool is_null();
};
/* Functions to handle the optimized IN */
/* A vector of values of some type */
class in_vector :public Sql_alloc
{
public:
char *base;
uint size;
qsort2_cmp compare;
CHARSET_INFO *collation;
uint count;
uint used_count;
in_vector() {}
in_vector(uint elements,uint element_length,qsort2_cmp cmp_func,
CHARSET_INFO *cmp_coll)
:base((char*) sql_calloc(elements*element_length)),
size(element_length), compare(cmp_func), collation(cmp_coll),
count(elements), used_count(elements) {}
virtual ~in_vector() {}
virtual void set(uint pos,Item *item)=0;
virtual uchar *get_value(Item *item)=0;
void sort()
{
my_qsort2(base,used_count,size,compare,(void*)collation);
}
int find(Item *item);
/*
Create an instance of Item_{type} (e.g. Item_decimal) constant object
which type allows it to hold an element of this vector without any
conversions.
The purpose of this function is to be able to get elements of this
vector in form of Item_xxx constants without creating Item_xxx object
for every array element you get (i.e. this implements "FlyWeight" pattern)
*/
virtual Item* create_item() { return NULL; }
/*
Store the value at position #pos into provided item object
SYNOPSIS
value_to_item()
pos Index of value to store
item Constant item to store value into. The item must be of the same
type that create_item() returns.
*/
virtual void value_to_item(uint pos, Item *item) { }
/* Compare values number pos1 and pos2 for equality */
bool compare_elems(uint pos1, uint pos2)
{
return MY_TEST(compare(collation, base + pos1 * size, base + pos2 * size));
}
virtual Item_result result_type()= 0;
};
class in_string :public in_vector
{
char buff[STRING_BUFFER_USUAL_SIZE];
String tmp;
class Item_string_for_in_vector: public Item_string
{
public:
Item_string_for_in_vector(CHARSET_INFO *cs):
Item_string(cs)
{ }
void set_value(const String *str)
{
str_value= *str;
collation.set(str->charset());
}
};
public:
in_string(uint elements,qsort2_cmp cmp_func, CHARSET_INFO *cs);
~in_string();
void set(uint pos,Item *item);
uchar *get_value(Item *item);
Item* create_item()
{
return new Item_string_for_in_vector(collation);
}
void value_to_item(uint pos, Item *item)
{
String *str=((String*) base)+pos;
Item_string_for_in_vector *to= (Item_string_for_in_vector*) item;
to->set_value(str);
}
Item_result result_type() { return STRING_RESULT; }
};
class in_longlong :public in_vector
{
protected:
/*
Here we declare a temporary variable (tmp) of the same type as the
elements of this vector. tmp is used in finding if a given value is in
the list.
*/
struct packed_longlong
{
longlong val;
longlong unsigned_flag; // Use longlong, not bool, to preserve alignment
} tmp;
public:
in_longlong(uint elements);
void set(uint pos,Item *item);
uchar *get_value(Item *item);
Item* create_item()
{
/*
We're created a signed INT, this may not be correct in
general case (see BUG#19342).
*/
return new Item_int((longlong)0);
}
void value_to_item(uint pos, Item *item)
{
((Item_int*) item)->value= ((packed_longlong*) base)[pos].val;
((Item_int*) item)->unsigned_flag= (bool)
((packed_longlong*) base)[pos].unsigned_flag;
}
Item_result result_type() { return INT_RESULT; }