mirror of
https://github.com/MariaDB/server.git
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526569690e
sql/handler.h: Fixed (portability) bug. No qualified method names in the class definition. sql/item_cmpfunc.h: Attempt to silence cast warnings on some platforms. sql/item_subselect.h: Attempt to silence cast warnings on some platforms. sql/set_var.cc: Silence warning (missing cast). sql/spatial.h: Attempt to silence cast warnings on some platforms. sql/sql_cache.cc: Silence warning (wrong cast). sql/sql_lex.h: Attempt to silence cast warnings on some platforms.
1002 lines
27 KiB
C++
1002 lines
27 KiB
C++
/* Copyright (C) 2000-2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* compare and test functions */
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#ifdef __GNUC__
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#pragma interface /* gcc class implementation */
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#endif
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extern Item_result item_cmp_type(Item_result a,Item_result b);
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class Item_bool_func2;
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class Arg_comparator;
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typedef int (Arg_comparator::*arg_cmp_func)();
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class Arg_comparator: public Sql_alloc
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{
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Item **a, **b;
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arg_cmp_func func;
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Item_bool_func2 *owner;
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Arg_comparator *comparators; // used only for compare_row()
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public:
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DTCollation cmp_collation;
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Arg_comparator() {};
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Arg_comparator(Item **a1, Item **a2): a(a1), b(a2) {};
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int set_compare_func(Item_bool_func2 *owner, Item_result type);
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inline int set_compare_func(Item_bool_func2 *owner_arg)
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{
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return set_compare_func(owner_arg, item_cmp_type((*a)->result_type(),
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(*b)->result_type()));
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}
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inline int set_cmp_func(Item_bool_func2 *owner_arg,
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Item **a1, Item **a2,
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Item_result type)
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{
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a= a1;
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b= a2;
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return set_compare_func(owner_arg, type);
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}
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inline int set_cmp_func(Item_bool_func2 *owner_arg,
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Item **a1, Item **a2)
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{
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return set_cmp_func(owner_arg, a1, a2, item_cmp_type((*a1)->result_type(),
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(*a2)->result_type()));
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}
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inline int compare() { return (this->*func)(); }
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int compare_string(); // compare args[0] & args[1]
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int compare_binary_string(); // compare args[0] & args[1]
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int compare_real(); // compare args[0] & args[1]
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int compare_int(); // compare args[0] & args[1]
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int compare_row(); // compare args[0] & args[1]
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int compare_e_string(); // compare args[0] & args[1]
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int compare_e_binary_string(); // compare args[0] & args[1]
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int compare_e_real(); // compare args[0] & args[1]
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int compare_e_int(); // compare args[0] & args[1]
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int compare_e_row(); // compare args[0] & args[1]
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static arg_cmp_func comparator_matrix [4][2];
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friend class Item_func;
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};
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class Item_bool_func :public Item_int_func
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{
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public:
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Item_bool_func() :Item_int_func() {}
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Item_bool_func(Item *a) :Item_int_func(a) {}
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Item_bool_func(Item *a,Item *b) :Item_int_func(a,b) {}
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Item_bool_func(THD *thd, Item_bool_func *item) :Item_int_func(thd, item) {}
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void fix_length_and_dec() { decimals=0; max_length=1; }
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};
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class Item_cache;
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class Item_in_optimizer: public Item_bool_func
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{
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protected:
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Item_cache *cache;
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bool save_cache;
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public:
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Item_in_optimizer(Item *a, Item_in_subselect *b):
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Item_bool_func(a, my_reinterpret_cast(Item *)(b)), cache(0), save_cache(0)
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{}
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bool fix_fields(THD *, struct st_table_list *, Item **);
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bool fix_left(THD *thd, struct st_table_list *tables, Item **ref);
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bool is_null();
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/*
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Item_in_optimizer item is special boolean function. On value request
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(one of val, val_int or val_str methods) it evaluate left expression
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of IN by storing it value in cache item (one of Item_cache* items),
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then it test cache is it NULL. If left expression (cache) is NULL then
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Item_in_optimizer return NULL, else it evaluate Item_in_subselect.
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*/
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longlong val_int();
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void cleanup();
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const char *func_name() const { return "<in_optimizer>"; }
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Item_cache **get_cache() { return &cache; }
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void keep_top_level_cache();
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};
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class Comp_creator
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{
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public:
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virtual Item_bool_func2* create(Item *a, Item *b) const = 0;
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virtual const char* symbol(bool invert) const = 0;
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virtual bool eqne_op() const = 0;
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virtual bool l_op() const = 0;
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};
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class Eq_creator :public Comp_creator
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{
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public:
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virtual Item_bool_func2* create(Item *a, Item *b) const;
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virtual const char* symbol(bool invert) const { return invert? "<>" : "="; }
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virtual bool eqne_op() const { return 1; }
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virtual bool l_op() const { return 0; }
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};
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class Ne_creator :public Comp_creator
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{
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public:
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virtual Item_bool_func2* create(Item *a, Item *b) const;
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virtual const char* symbol(bool invert) const { return invert? "=" : "<>"; }
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virtual bool eqne_op() const { return 1; }
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virtual bool l_op() const { return 0; }
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};
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class Gt_creator :public Comp_creator
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{
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public:
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virtual Item_bool_func2* create(Item *a, Item *b) const;
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virtual const char* symbol(bool invert) const { return invert? "<=" : ">"; }
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virtual bool eqne_op() const { return 0; }
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virtual bool l_op() const { return 0; }
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};
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class Lt_creator :public Comp_creator
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{
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public:
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virtual Item_bool_func2* create(Item *a, Item *b) const;
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virtual const char* symbol(bool invert) const { return invert? ">=" : "<"; }
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virtual bool eqne_op() const { return 0; }
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virtual bool l_op() const { return 1; }
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};
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class Ge_creator :public Comp_creator
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{
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public:
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virtual Item_bool_func2* create(Item *a, Item *b) const;
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virtual const char* symbol(bool invert) const { return invert? "<" : ">="; }
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virtual bool eqne_op() const { return 0; }
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virtual bool l_op() const { return 0; }
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};
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class Le_creator :public Comp_creator
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{
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public:
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virtual Item_bool_func2* create(Item *a, Item *b) const;
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virtual const char* symbol(bool invert) const { return invert? ">" : "<="; }
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virtual bool eqne_op() const { return 0; }
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virtual bool l_op() const { return 1; }
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};
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class Item_bool_func2 :public Item_int_func
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{ /* Bool with 2 string args */
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protected:
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Arg_comparator cmp;
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String tmp_value1,tmp_value2;
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public:
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Item_bool_func2(Item *a,Item *b)
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:Item_int_func(a,b), cmp(tmp_arg, tmp_arg+1) {}
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void fix_length_and_dec();
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void set_cmp_func()
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{
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cmp.set_cmp_func(this, tmp_arg, tmp_arg+1);
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}
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optimize_type select_optimize() const { return OPTIMIZE_OP; }
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virtual enum Functype rev_functype() const { return UNKNOWN_FUNC; }
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bool have_rev_func() const { return rev_functype() != UNKNOWN_FUNC; }
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void print(String *str) { Item_func::print_op(str); }
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bool is_null() { return test(args[0]->is_null() || args[1]->is_null()); }
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CHARSET_INFO *compare_collation() { return cmp.cmp_collation.collation; }
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friend class Arg_comparator;
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};
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class Item_bool_rowready_func2 :public Item_bool_func2
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{
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Item *orig_a, *orig_b; /* propagate_const can change parameters */
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public:
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Item_bool_rowready_func2(Item *a,Item *b) :Item_bool_func2(a,b),
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orig_a(a), orig_b(b)
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{
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allowed_arg_cols= a->cols();
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}
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void cleanup()
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{
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DBUG_ENTER("Item_bool_rowready_func2::cleanup");
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Item_bool_func2::cleanup();
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tmp_arg[0]= orig_a;
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tmp_arg[1]= orig_b;
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DBUG_VOID_RETURN;
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}
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Item *neg_transformer(THD *thd);
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virtual Item *negated_item();
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};
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class Item_func_not :public Item_bool_func
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{
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public:
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Item_func_not(Item *a) :Item_bool_func(a) {}
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longlong val_int();
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enum Functype functype() const { return NOT_FUNC; }
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const char *func_name() const { return "not"; }
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Item *neg_transformer(THD *thd);
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};
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class Item_func_not_all :public Item_func_not
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{
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bool abort_on_null;
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public:
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bool show;
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Item_func_not_all(Item *a) :Item_func_not(a), abort_on_null(0), show(0) {}
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virtual void top_level_item() { abort_on_null= 1; }
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bool top_level() { return abort_on_null; }
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longlong val_int();
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enum Functype functype() const { return NOT_ALL_FUNC; }
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const char *func_name() const { return "<not>"; }
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void print(String *str);
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};
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class Item_func_eq :public Item_bool_rowready_func2
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{
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public:
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Item_func_eq(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {}
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longlong val_int();
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enum Functype functype() const { return EQ_FUNC; }
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enum Functype rev_functype() const { return EQ_FUNC; }
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cond_result eq_cmp_result() const { return COND_TRUE; }
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const char *func_name() const { return "="; }
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Item *negated_item();
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};
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class Item_func_equal :public Item_bool_rowready_func2
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{
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public:
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Item_func_equal(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
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longlong val_int();
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void fix_length_and_dec();
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enum Functype functype() const { return EQUAL_FUNC; }
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enum Functype rev_functype() const { return EQUAL_FUNC; }
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cond_result eq_cmp_result() const { return COND_TRUE; }
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const char *func_name() const { return "<=>"; }
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Item* neg_transformer(THD *thd) { return 0; }
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};
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class Item_func_ge :public Item_bool_rowready_func2
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{
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public:
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Item_func_ge(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
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longlong val_int();
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enum Functype functype() const { return GE_FUNC; }
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enum Functype rev_functype() const { return LE_FUNC; }
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cond_result eq_cmp_result() const { return COND_TRUE; }
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const char *func_name() const { return ">="; }
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Item *negated_item();
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};
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class Item_func_gt :public Item_bool_rowready_func2
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{
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public:
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Item_func_gt(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
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longlong val_int();
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enum Functype functype() const { return GT_FUNC; }
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enum Functype rev_functype() const { return LT_FUNC; }
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cond_result eq_cmp_result() const { return COND_FALSE; }
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const char *func_name() const { return ">"; }
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Item *negated_item();
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};
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class Item_func_le :public Item_bool_rowready_func2
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{
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public:
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Item_func_le(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {};
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longlong val_int();
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enum Functype functype() const { return LE_FUNC; }
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enum Functype rev_functype() const { return GE_FUNC; }
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cond_result eq_cmp_result() const { return COND_TRUE; }
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const char *func_name() const { return "<="; }
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Item *negated_item();
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};
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class Item_func_lt :public Item_bool_rowready_func2
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{
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public:
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Item_func_lt(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {}
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longlong val_int();
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enum Functype functype() const { return LT_FUNC; }
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enum Functype rev_functype() const { return GT_FUNC; }
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cond_result eq_cmp_result() const { return COND_FALSE; }
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const char *func_name() const { return "<"; }
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Item *negated_item();
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};
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class Item_func_ne :public Item_bool_rowready_func2
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{
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public:
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Item_func_ne(Item *a,Item *b) :Item_bool_rowready_func2(a,b) {}
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longlong val_int();
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enum Functype functype() const { return NE_FUNC; }
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cond_result eq_cmp_result() const { return COND_FALSE; }
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optimize_type select_optimize() const { return OPTIMIZE_KEY; }
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const char *func_name() const { return "<>"; }
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Item *negated_item();
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};
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class Item_func_between :public Item_int_func
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{
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DTCollation cmp_collation;
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public:
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Item_result cmp_type;
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String value0,value1,value2;
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Item_func_between(Item *a,Item *b,Item *c) :Item_int_func(a,b,c) {}
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longlong val_int();
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optimize_type select_optimize() const { return OPTIMIZE_KEY; }
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enum Functype functype() const { return BETWEEN; }
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const char *func_name() const { return "between"; }
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void fix_length_and_dec();
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void print(String *str);
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CHARSET_INFO *compare_collation() { return cmp_collation.collation; }
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};
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class Item_func_strcmp :public Item_bool_func2
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{
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public:
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Item_func_strcmp(Item *a,Item *b) :Item_bool_func2(a,b) {}
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longlong val_int();
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optimize_type select_optimize() const { return OPTIMIZE_NONE; }
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const char *func_name() const { return "strcmp"; }
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};
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class Item_func_interval :public Item_int_func
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{
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Item_row *row;
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double *intervals;
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public:
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Item_func_interval(Item_row *a)
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:Item_int_func(a),row(a),intervals(0) { allowed_arg_cols= a->cols(); }
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longlong val_int();
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void fix_length_and_dec();
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const char *func_name() const { return "interval"; }
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};
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class Item_func_ifnull :public Item_func
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{
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enum Item_result cached_result_type;
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enum_field_types cached_field_type;
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bool field_type_defined;
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public:
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Item_func_ifnull(Item *a,Item *b)
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:Item_func(a,b), cached_result_type(INT_RESULT)
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{}
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double val();
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longlong val_int();
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String *val_str(String *str);
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enum Item_result result_type () const { return cached_result_type; }
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enum_field_types field_type() const;
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void fix_length_and_dec();
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const char *func_name() const { return "ifnull"; }
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Field *tmp_table_field(TABLE *table);
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table_map not_null_tables() const { return 0; }
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};
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class Item_func_if :public Item_func
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{
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enum Item_result cached_result_type;
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public:
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Item_func_if(Item *a,Item *b,Item *c)
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:Item_func(a,b,c), cached_result_type(INT_RESULT)
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{}
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double val();
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longlong val_int();
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String *val_str(String *str);
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enum Item_result result_type () const { return cached_result_type; }
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bool fix_fields(THD *thd,struct st_table_list *tlist, Item **ref)
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{
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DBUG_ASSERT(fixed == 0);
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args[0]->top_level_item();
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return Item_func::fix_fields(thd, tlist, ref);
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}
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void fix_length_and_dec();
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const char *func_name() const { return "if"; }
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table_map not_null_tables() const { return 0; }
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};
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class Item_func_nullif :public Item_bool_func2
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{
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enum Item_result cached_result_type;
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public:
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Item_func_nullif(Item *a,Item *b)
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:Item_bool_func2(a,b), cached_result_type(INT_RESULT)
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{}
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double val();
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longlong val_int();
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String *val_str(String *str);
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enum Item_result result_type () const { return cached_result_type; }
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void fix_length_and_dec();
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const char *func_name() const { return "nullif"; }
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void print(String *str) { Item_func::print(str); }
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table_map not_null_tables() const { return 0; }
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};
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class Item_func_coalesce :public Item_func
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{
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enum Item_result cached_result_type;
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public:
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Item_func_coalesce(List<Item> &list)
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:Item_func(list),cached_result_type(INT_RESULT)
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{}
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double val();
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longlong val_int();
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String *val_str(String *);
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void fix_length_and_dec();
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enum Item_result result_type () const { return cached_result_type; }
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const char *func_name() const { return "coalesce"; }
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table_map not_null_tables() const { return 0; }
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};
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class Item_func_case :public Item_func
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{
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int first_expr_num, else_expr_num;
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enum Item_result cached_result_type;
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String tmp_value;
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uint ncases;
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Item_result cmp_type;
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DTCollation cmp_collation;
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public:
|
|
Item_func_case(List<Item> &list, Item *first_expr_arg, Item *else_expr_arg)
|
|
:Item_func(), first_expr_num(-1), else_expr_num(-1),
|
|
cached_result_type(INT_RESULT)
|
|
{
|
|
ncases= list.elements;
|
|
if (first_expr_arg)
|
|
{
|
|
first_expr_num= list.elements;
|
|
list.push_back(first_expr_arg);
|
|
}
|
|
if (else_expr_arg)
|
|
{
|
|
else_expr_num= list.elements;
|
|
list.push_back(else_expr_arg);
|
|
}
|
|
set_arguments(list);
|
|
}
|
|
double val();
|
|
longlong val_int();
|
|
String *val_str(String *);
|
|
void fix_length_and_dec();
|
|
table_map not_null_tables() const { return 0; }
|
|
enum Item_result result_type () const { return cached_result_type; }
|
|
const char *func_name() const { return "case"; }
|
|
void print(String *str);
|
|
Item *find_item(String *str);
|
|
CHARSET_INFO *compare_collation() { return cmp_collation.collation; }
|
|
};
|
|
|
|
|
|
/* Functions to handle the optimized IN */
|
|
|
|
class in_vector :public Sql_alloc
|
|
{
|
|
protected:
|
|
char *base;
|
|
uint size;
|
|
qsort2_cmp compare;
|
|
CHARSET_INFO *collation;
|
|
uint count;
|
|
public:
|
|
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 byte *get_value(Item *item)=0;
|
|
void sort()
|
|
{
|
|
qsort2(base,used_count,size,compare,collation);
|
|
}
|
|
int find(Item *item);
|
|
};
|
|
|
|
class in_string :public in_vector
|
|
{
|
|
char buff[80];
|
|
String tmp;
|
|
public:
|
|
in_string(uint elements,qsort2_cmp cmp_func, CHARSET_INFO *cs);
|
|
~in_string();
|
|
void set(uint pos,Item *item);
|
|
byte *get_value(Item *item);
|
|
};
|
|
|
|
class in_longlong :public in_vector
|
|
{
|
|
longlong tmp;
|
|
public:
|
|
in_longlong(uint elements);
|
|
void set(uint pos,Item *item);
|
|
byte *get_value(Item *item);
|
|
};
|
|
|
|
class in_double :public in_vector
|
|
{
|
|
double tmp;
|
|
public:
|
|
in_double(uint elements);
|
|
void set(uint pos,Item *item);
|
|
byte *get_value(Item *item);
|
|
};
|
|
|
|
/*
|
|
** Classes for easy comparing of non const items
|
|
*/
|
|
|
|
class cmp_item :public Sql_alloc
|
|
{
|
|
public:
|
|
CHARSET_INFO *cmp_charset;
|
|
cmp_item() { cmp_charset= &my_charset_bin; }
|
|
virtual ~cmp_item() {}
|
|
virtual void store_value(Item *item)= 0;
|
|
virtual int cmp(Item *item)= 0;
|
|
// for optimized IN with row
|
|
virtual int compare(cmp_item *item)= 0;
|
|
static cmp_item* get_comparator(Item *);
|
|
virtual cmp_item *make_same()= 0;
|
|
virtual void store_value_by_template(cmp_item *tmpl, Item *item)
|
|
{
|
|
store_value(item);
|
|
}
|
|
};
|
|
|
|
class cmp_item_string :public cmp_item
|
|
{
|
|
protected:
|
|
String *value_res;
|
|
public:
|
|
cmp_item_string (CHARSET_INFO *cs) { cmp_charset= cs; }
|
|
friend class cmp_item_sort_string;
|
|
friend class cmp_item_sort_string_in_static;
|
|
};
|
|
|
|
class cmp_item_sort_string :public cmp_item_string
|
|
{
|
|
protected:
|
|
char value_buff[80];
|
|
String value;
|
|
public:
|
|
cmp_item_sort_string(CHARSET_INFO *cs):
|
|
cmp_item_string(cs),
|
|
value(value_buff, sizeof(value_buff), cs) {}
|
|
void store_value(Item *item)
|
|
{
|
|
value_res= item->val_str(&value);
|
|
}
|
|
int cmp(Item *arg)
|
|
{
|
|
char buff[80];
|
|
String tmp(buff, sizeof(buff), cmp_charset), *res;
|
|
if (!(res= arg->val_str(&tmp)))
|
|
return 1; /* Can't be right */
|
|
return sortcmp(value_res, res, cmp_charset);
|
|
}
|
|
int compare(cmp_item *c)
|
|
{
|
|
cmp_item_string *cmp= (cmp_item_string *)c;
|
|
return sortcmp(value_res, cmp->value_res, cmp_charset);
|
|
}
|
|
cmp_item *make_same();
|
|
};
|
|
|
|
class cmp_item_int :public cmp_item
|
|
{
|
|
longlong value;
|
|
public:
|
|
void store_value(Item *item)
|
|
{
|
|
value= item->val_int();
|
|
}
|
|
int cmp(Item *arg)
|
|
{
|
|
return value != arg->val_int();
|
|
}
|
|
int compare(cmp_item *c)
|
|
{
|
|
cmp_item_int *cmp= (cmp_item_int *)c;
|
|
return (value < cmp->value) ? -1 : ((value == cmp->value) ? 0 : 1);
|
|
}
|
|
cmp_item *make_same();
|
|
};
|
|
|
|
class cmp_item_real :public cmp_item
|
|
{
|
|
double value;
|
|
public:
|
|
void store_value(Item *item)
|
|
{
|
|
value= item->val();
|
|
}
|
|
int cmp(Item *arg)
|
|
{
|
|
return value != arg->val();
|
|
}
|
|
int compare(cmp_item *c)
|
|
{
|
|
cmp_item_real *cmp= (cmp_item_real *)c;
|
|
return (value < cmp->value)? -1 : ((value == cmp->value) ? 0 : 1);
|
|
}
|
|
cmp_item *make_same();
|
|
};
|
|
|
|
class cmp_item_row :public cmp_item
|
|
{
|
|
cmp_item **comparators;
|
|
uint n;
|
|
public:
|
|
cmp_item_row(): comparators(0), n(0) {}
|
|
~cmp_item_row();
|
|
void store_value(Item *item);
|
|
int cmp(Item *arg);
|
|
int compare(cmp_item *arg);
|
|
cmp_item *make_same();
|
|
void store_value_by_template(cmp_item *tmpl, Item *);
|
|
};
|
|
|
|
|
|
class in_row :public in_vector
|
|
{
|
|
cmp_item_row tmp;
|
|
public:
|
|
in_row(uint elements, Item *);
|
|
~in_row();
|
|
void set(uint pos,Item *item);
|
|
byte *get_value(Item *item);
|
|
};
|
|
|
|
/*
|
|
cmp_item for optimized IN with row (right part string, which never
|
|
be changed)
|
|
*/
|
|
|
|
class cmp_item_sort_string_in_static :public cmp_item_string
|
|
{
|
|
protected:
|
|
String value;
|
|
public:
|
|
cmp_item_sort_string_in_static(CHARSET_INFO *cs):
|
|
cmp_item_string(cs) {}
|
|
void store_value(Item *item)
|
|
{
|
|
value_res= item->val_str(&value);
|
|
}
|
|
int cmp(Item *item)
|
|
{
|
|
// Should never be called
|
|
DBUG_ASSERT(0);
|
|
return 1;
|
|
}
|
|
int compare(cmp_item *c)
|
|
{
|
|
cmp_item_string *cmp= (cmp_item_string *)c;
|
|
return sortcmp(value_res, cmp->value_res, cmp_charset);
|
|
}
|
|
cmp_item *make_same()
|
|
{
|
|
return new cmp_item_sort_string_in_static(cmp_charset);
|
|
}
|
|
};
|
|
|
|
class Item_func_in :public Item_int_func
|
|
{
|
|
Item_result cmp_type;
|
|
in_vector *array;
|
|
cmp_item *in_item;
|
|
bool have_null;
|
|
DTCollation cmp_collation;
|
|
public:
|
|
Item_func_in(List<Item> &list)
|
|
:Item_int_func(list), array(0), in_item(0), have_null(0)
|
|
{
|
|
allowed_arg_cols= args[0]->cols();
|
|
}
|
|
longlong val_int();
|
|
void fix_length_and_dec();
|
|
void cleanup()
|
|
{
|
|
DBUG_ENTER("Item_func_in::cleanup");
|
|
Item_int_func::cleanup();
|
|
delete array;
|
|
delete in_item;
|
|
array= 0;
|
|
in_item= 0;
|
|
DBUG_VOID_RETURN;
|
|
}
|
|
optimize_type select_optimize() const
|
|
{ return array ? OPTIMIZE_KEY : OPTIMIZE_NONE; }
|
|
void print(String *str);
|
|
enum Functype functype() const { return IN_FUNC; }
|
|
const char *func_name() const { return " IN "; }
|
|
bool nulls_in_row();
|
|
CHARSET_INFO *compare_collation() { return cmp_collation.collation; }
|
|
};
|
|
|
|
/* Functions used by where clause */
|
|
|
|
class Item_func_isnull :public Item_bool_func
|
|
{
|
|
protected:
|
|
longlong cached_value;
|
|
public:
|
|
Item_func_isnull(Item *a) :Item_bool_func(a) {}
|
|
longlong val_int();
|
|
enum Functype functype() const { return ISNULL_FUNC; }
|
|
void fix_length_and_dec()
|
|
{
|
|
decimals=0; max_length=1; maybe_null=0;
|
|
update_used_tables();
|
|
}
|
|
const char *func_name() const { return "isnull"; }
|
|
/* Optimize case of not_null_column IS NULL */
|
|
virtual void update_used_tables()
|
|
{
|
|
if (!args[0]->maybe_null)
|
|
{
|
|
used_tables_cache= 0; /* is always false */
|
|
const_item_cache= 1;
|
|
cached_value= (longlong) 0;
|
|
}
|
|
else
|
|
{
|
|
args[0]->update_used_tables();
|
|
if (!(used_tables_cache=args[0]->used_tables()))
|
|
{
|
|
/* Remember if the value is always NULL or never NULL */
|
|
cached_value= (longlong) args[0]->is_null();
|
|
}
|
|
}
|
|
}
|
|
table_map not_null_tables() const { return 0; }
|
|
optimize_type select_optimize() const { return OPTIMIZE_NULL; }
|
|
Item *neg_transformer(THD *thd);
|
|
CHARSET_INFO *compare_collation() { return args[0]->collation.collation; }
|
|
};
|
|
|
|
/* Functions used by HAVING for rewriting IN subquery */
|
|
|
|
class Item_in_subselect;
|
|
class Item_is_not_null_test :public Item_func_isnull
|
|
{
|
|
Item_in_subselect* owner;
|
|
public:
|
|
Item_is_not_null_test(Item_in_subselect* ow, Item *a)
|
|
:Item_func_isnull(a), owner(ow)
|
|
{}
|
|
enum Functype functype() const { return ISNOTNULLTEST_FUNC; }
|
|
longlong val_int();
|
|
const char *func_name() const { return "<is_not_null_test>"; }
|
|
void update_used_tables();
|
|
};
|
|
|
|
|
|
class Item_func_isnotnull :public Item_bool_func
|
|
{
|
|
public:
|
|
Item_func_isnotnull(Item *a) :Item_bool_func(a) {}
|
|
longlong val_int();
|
|
enum Functype functype() const { return ISNOTNULL_FUNC; }
|
|
void fix_length_and_dec()
|
|
{
|
|
decimals=0; max_length=1; maybe_null=0;
|
|
}
|
|
const char *func_name() const { return "isnotnull"; }
|
|
optimize_type select_optimize() const { return OPTIMIZE_NULL; }
|
|
table_map not_null_tables() const { return 0; }
|
|
Item *neg_transformer(THD *thd);
|
|
void print(String *str);
|
|
CHARSET_INFO *compare_collation() { return args[0]->collation.collation; }
|
|
};
|
|
|
|
|
|
class Item_func_like :public Item_bool_func2
|
|
{
|
|
// Turbo Boyer-Moore data
|
|
bool canDoTurboBM; // pattern is '%abcd%' case
|
|
const char* pattern;
|
|
int pattern_len;
|
|
|
|
// TurboBM buffers, *this is owner
|
|
int* bmGs; // good suffix shift table, size is pattern_len + 1
|
|
int* bmBc; // bad character shift table, size is alphabet_size
|
|
|
|
void turboBM_compute_suffixes(int* suff);
|
|
void turboBM_compute_good_suffix_shifts(int* suff);
|
|
void turboBM_compute_bad_character_shifts();
|
|
bool turboBM_matches(const char* text, int text_len) const;
|
|
enum { alphabet_size = 256 };
|
|
|
|
public:
|
|
char escape;
|
|
|
|
Item_func_like(Item *a,Item *b, char* escape_arg)
|
|
:Item_bool_func2(a,b), canDoTurboBM(false), pattern(0), pattern_len(0),
|
|
bmGs(0), bmBc(0), escape(*escape_arg) {}
|
|
longlong val_int();
|
|
enum Functype functype() const { return LIKE_FUNC; }
|
|
optimize_type select_optimize() const;
|
|
cond_result eq_cmp_result() const { return COND_TRUE; }
|
|
const char *func_name() const { return "like"; }
|
|
bool fix_fields(THD *thd, struct st_table_list *tlist, Item **ref);
|
|
};
|
|
|
|
#ifdef USE_REGEX
|
|
|
|
#include <regex.h>
|
|
|
|
class Item_func_regex :public Item_bool_func
|
|
{
|
|
regex_t preg;
|
|
bool regex_compiled;
|
|
bool regex_is_const;
|
|
String prev_regexp;
|
|
DTCollation cmp_collation;
|
|
public:
|
|
Item_func_regex(Item *a,Item *b) :Item_bool_func(a,b),
|
|
regex_compiled(0),regex_is_const(0) {}
|
|
~Item_func_regex();
|
|
longlong val_int();
|
|
bool fix_fields(THD *thd, struct st_table_list *tlist, Item **ref);
|
|
const char *func_name() const { return "regexp"; }
|
|
void print(String *str) { print_op(str); }
|
|
CHARSET_INFO *compare_collation() { return cmp_collation.collation; }
|
|
};
|
|
|
|
#else
|
|
|
|
class Item_func_regex :public Item_bool_func
|
|
{
|
|
public:
|
|
Item_func_regex(Item *a,Item *b) :Item_bool_func(a,b) {}
|
|
longlong val_int() { return 0;}
|
|
const char *func_name() const { return "regex"; }
|
|
void print(String *str) { print_op(str); }
|
|
};
|
|
|
|
#endif /* USE_REGEX */
|
|
|
|
|
|
typedef class Item COND;
|
|
|
|
class Item_cond :public Item_bool_func
|
|
{
|
|
protected:
|
|
List<Item> list;
|
|
bool abort_on_null;
|
|
table_map and_tables_cache;
|
|
|
|
public:
|
|
/* Item_cond() is only used to create top level items */
|
|
Item_cond(): Item_bool_func(), abort_on_null(1)
|
|
{ const_item_cache=0; }
|
|
Item_cond(Item *i1,Item *i2)
|
|
:Item_bool_func(), abort_on_null(0)
|
|
{
|
|
list.push_back(i1);
|
|
list.push_back(i2);
|
|
}
|
|
Item_cond(THD *thd, Item_cond *item);
|
|
Item_cond(List<Item> &nlist)
|
|
:Item_bool_func(), list(nlist), abort_on_null(0) {}
|
|
bool add(Item *item) { return list.push_back(item); }
|
|
bool fix_fields(THD *, struct st_table_list *, Item **ref);
|
|
|
|
enum Type type() const { return COND_ITEM; }
|
|
List<Item>* argument_list() { return &list; }
|
|
table_map used_tables() const;
|
|
void update_used_tables();
|
|
void print(String *str);
|
|
void split_sum_func(Item **ref_pointer_array, List<Item> &fields);
|
|
friend int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds);
|
|
void top_level_item() { abort_on_null=1; }
|
|
void copy_andor_arguments(THD *thd, Item_cond *item);
|
|
bool walk(Item_processor processor, byte *arg);
|
|
void neg_arguments(THD *thd);
|
|
};
|
|
|
|
|
|
class Item_cond_and :public Item_cond
|
|
{
|
|
public:
|
|
Item_cond_and() :Item_cond() {}
|
|
Item_cond_and(Item *i1,Item *i2) :Item_cond(i1,i2) {}
|
|
Item_cond_and(THD *thd, Item_cond_and *item) :Item_cond(thd, item) {}
|
|
Item_cond_and(List<Item> &list): Item_cond(list) {}
|
|
enum Functype functype() const { return COND_AND_FUNC; }
|
|
longlong val_int();
|
|
const char *func_name() const { return "and"; }
|
|
Item* copy_andor_structure(THD *thd)
|
|
{
|
|
Item_cond_and *item;
|
|
if ((item= new Item_cond_and(thd, this)))
|
|
item->copy_andor_arguments(thd, this);
|
|
return item;
|
|
}
|
|
Item *neg_transformer(THD *thd);
|
|
};
|
|
|
|
class Item_cond_or :public Item_cond
|
|
{
|
|
public:
|
|
Item_cond_or() :Item_cond() {}
|
|
Item_cond_or(Item *i1,Item *i2) :Item_cond(i1,i2) {}
|
|
Item_cond_or(THD *thd, Item_cond_or *item) :Item_cond(thd, item) {}
|
|
Item_cond_or(List<Item> &list): Item_cond(list) {}
|
|
enum Functype functype() const { return COND_OR_FUNC; }
|
|
longlong val_int();
|
|
const char *func_name() const { return "or"; }
|
|
table_map not_null_tables() const { return and_tables_cache; }
|
|
Item* copy_andor_structure(THD *thd)
|
|
{
|
|
Item_cond_or *item;
|
|
if ((item= new Item_cond_or(thd, this)))
|
|
item->copy_andor_arguments(thd, this);
|
|
return item;
|
|
}
|
|
Item *neg_transformer(THD *thd);
|
|
};
|
|
|
|
|
|
/*
|
|
XOR is Item_cond, not an Item_int_func bevause we could like to
|
|
optimize (a XOR b) later on. It's low prio, though
|
|
*/
|
|
|
|
class Item_cond_xor :public Item_cond
|
|
{
|
|
public:
|
|
Item_cond_xor() :Item_cond() {}
|
|
Item_cond_xor(Item *i1,Item *i2) :Item_cond(i1,i2) {}
|
|
enum Functype functype() const { return COND_XOR_FUNC; }
|
|
/* TODO: remove the next line when implementing XOR optimization */
|
|
enum Type type() const { return FUNC_ITEM; }
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longlong val_int();
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const char *func_name() const { return "xor"; }
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|
};
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/* Some usefull inline functions */
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inline Item *and_conds(Item *a, Item *b)
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{
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|
if (!b) return a;
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if (!a) return b;
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return new Item_cond_and(a, b);
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}
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Item *and_expressions(Item *a, Item *b, Item **org_item);
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