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Edit File : item_jsonfunc.h \| Size : 21.99 KB
#ifndef ITEM_JSONFUNC_INCLUDED #define ITEM_JSONFUNC_INCLUDED /* Copyright (c) 2016, 2021, MariaDB 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 St, Fifth Floor, Boston, MA 02110-1301 USA / / This file defines all JSON functions / #include <json_lib.h> #include "item_cmpfunc.h" // Item_bool_func #include "item_strfunc.h" // Item_str_func #include "item_sum.h" #include "sql_type_json.h" class json_path_with_flags { public: json_path_t p; bool constant; bool parsed; json_path_step_t cur_step; void set_constant_flag(bool s_constant) { constant= s_constant; parsed= FALSE; } }; void report_path_error_ex(const char ps, json_path_t p, const char fname, int n_param, Sql_condition::enum_warning_level lv); void report_json_error_ex(const char js, json_engine_t je, const char fname, int n_param, Sql_condition::enum_warning_level lv); class Json_engine_scan: public json_engine_t { public: Json_engine_scan(CHARSET_INFO i_cs, const uchar str, const uchar end) { json_scan_start(this, i_cs, str, end); } Json_engine_scan(const String &str) :Json_engine_scan(str.charset(), (const uchar ) str.ptr(), (const uchar ) str.end()) { } bool check_and_get_value_scalar(String res, int error); bool check_and_get_value_complex(String res, int error); }; class Json_path_extractor: public json_path_with_flags { protected: String tmp_js, tmp_path; virtual ~Json_path_extractor() { } virtual bool check_and_get_value(Json_engine_scan je, String to, int error)=0; bool extract(String to, Item js, Item jp, CHARSET_INFO cs); }; class Item_func_json_valid: public Item_bool_func { protected: String tmp_value; public: Item_func_json_valid(THD thd, Item json) : Item_bool_func(thd, json) {} bool val_bool() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_valid") }; return name; } bool fix_length_and_dec() override { if (Item_bool_func::fix_length_and_dec()) return TRUE; set_maybe_null(); return FALSE; } bool set_format_by_check_constraint(Send_field_extended_metadata to) const override { static const Lex_cstring fmt(STRING_WITH_LEN("json")); return to->set_format_name(fmt); } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_valid>(thd, this); } enum Functype functype() const override { return JSON_VALID_FUNC; } }; class Item_func_json_exists: public Item_bool_func { protected: json_path_with_flags path; String tmp_js, tmp_path; public: Item_func_json_exists(THD thd, Item js, Item i_path): Item_bool_func(thd, js, i_path) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_exists") }; return name; } bool fix_length_and_dec() override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_exists>(thd, this); } bool val_bool() override; }; class Item_json_func: public Item_str_func { public: Item_json_func(THD thd) :Item_str_func(thd) { } Item_json_func(THD thd, Item a) :Item_str_func(thd, a) { } Item_json_func(THD thd, Item a, Item b) :Item_str_func(thd, a, b) { } Item_json_func(THD thd, List<Item> &list) :Item_str_func(thd, list) { } const Type_handler type_handler() const override { return Type_handler_json_common::json_type_handler(max_length); } }; class Item_func_json_value: public Item_str_func, public Json_path_extractor { public: Item_func_json_value(THD thd, Item js, Item i_path): Item_str_func(thd, js, i_path) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_value") }; return name; } bool fix_length_and_dec() override ; String val_str(String to) override { null_value= Json_path_extractor::extract(to, args[0], args[1], collation.collation); return null_value ? NULL : to; } bool check_and_get_value(Json_engine_scan je, String res, int error) override { return je->check_and_get_value_scalar(res, error); } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_value>(thd, this); } }; class Item_func_json_query: public Item_json_func, public Json_path_extractor { public: Item_func_json_query(THD thd, Item js, Item i_path): Item_json_func(thd, js, i_path) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_query") }; return name; } bool fix_length_and_dec() override; String val_str(String to) override { null_value= Json_path_extractor::extract(to, args[0], args[1], collation.collation); return null_value ? NULL : to; } bool check_and_get_value(Json_engine_scan je, String res, int error) override { return je->check_and_get_value_complex(res, error); } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_query>(thd, this); } }; class Item_func_json_quote: public Item_str_func { protected: String tmp_s; public: Item_func_json_quote(THD thd, Item s): Item_str_func(thd, s) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_quote") }; return name; } bool fix_length_and_dec() override; String val_str(String ) override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_quote>(thd, this); } }; class Item_func_json_unquote: public Item_str_func { protected: String tmp_s; String read_json(json_engine_t je); public: Item_func_json_unquote(THD thd, Item s): Item_str_func(thd, s) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_unquote") }; return name; } bool fix_length_and_dec() override; String val_str(String ) override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_unquote>(thd, this); } }; class Item_json_str_multipath: public Item_json_func { protected: json_path_with_flags paths; String tmp_paths; private: /** Number of paths returned by calling virtual method get_n_paths() and remembered inside fix_fields(). It is used by the virtual destructor ~Item_json_str_multipath() to iterate along allocated memory chunks stored in the array tmp_paths and free every of them. The virtual method get_n_paths() can't be used for this goal from within virtual destructor. We could get rid of the virtual method get_n_paths() and store the number of paths directly in the constructor of classes derived from the class Item_json_str_multipath but presence of the method get_n_paths() allows to check invariant that the number of arguments not changed between sequential runs of the same prepared statement that seems to be useful. / uint n_paths; public: Item_json_str_multipath(THD thd, List<Item> &list): Item_json_func(thd, list), paths(NULL), tmp_paths(0), n_paths(0) {} virtual ~Item_json_str_multipath(); bool fix_fields(THD thd, Item ref) override; virtual uint get_n_paths() const = 0; }; class Item_func_json_extract: public Item_json_str_multipath { protected: String tmp_js; public: String read_json(String str, json_value_types type, char *out_val, int value_len); Item_func_json_extract(THD thd, List<Item> &list): Item_json_str_multipath(thd, list) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_extract") }; return name; } enum Functype functype() const override { return JSON_EXTRACT_FUNC; } bool fix_length_and_dec() override; String val_str(String ) override; longlong val_int() override; double val_real() override; my_decimal val_decimal(my_decimal ) override; uint get_n_paths() const override { return arg_count - 1; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_extract>(thd, this); } }; class Item_func_json_contains: public Item_bool_func { protected: String tmp_js; json_path_with_flags path; String tmp_path; bool a2_constant, a2_parsed; String tmp_val, val; public: Item_func_json_contains(THD thd, List<Item> &list): Item_bool_func(thd, list) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_contains") }; return name; } bool fix_length_and_dec() override; bool val_bool() override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_contains>(thd, this); } }; class Item_func_json_contains_path: public Item_bool_func { protected: String tmp_js; json_path_with_flags paths; String tmp_paths; bool mode_one; bool ooa_constant, ooa_parsed; bool p_found; public: Item_func_json_contains_path(THD thd, List<Item> &list): Item_bool_func(thd, list), tmp_paths(0) {} virtual ~Item_func_json_contains_path(); LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_contains_path") }; return name; } bool fix_fields(THD thd, Item *ref) override; bool fix_length_and_dec() override; bool val_bool() override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_contains_path>(thd, this); } }; class Item_func_json_array: public Item_json_func { protected: String tmp_val; ulong result_limit; public: Item_func_json_array(THD thd): Item_json_func(thd) {} Item_func_json_array(THD thd, List<Item> &list): Item_json_func(thd, list) {} String val_str(String ) override; bool fix_length_and_dec() override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_array") }; return name; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_array>(thd, this); } }; class Item_func_json_array_append: public Item_json_str_multipath { protected: String tmp_js; String tmp_val; public: Item_func_json_array_append(THD thd, List<Item> &list): Item_json_str_multipath(thd, list) {} bool fix_length_and_dec() override; String val_str(String ) override; uint get_n_paths() const override { return arg_count/2; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_array_append") }; return name; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_array_append>(thd, this); } }; class Item_func_json_array_insert: public Item_func_json_array_append { public: Item_func_json_array_insert(THD thd, List<Item> &list): Item_func_json_array_append(thd, list) {} String val_str(String ) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_array_insert") }; return name; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_array_insert>(thd, this); } }; class Item_func_json_object: public Item_func_json_array { public: Item_func_json_object(THD thd): Item_func_json_array(thd) {} Item_func_json_object(THD thd, List<Item> &list): Item_func_json_array(thd, list) {} String val_str(String ) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_object") }; return name; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_object>(thd, this); } }; class Item_func_json_merge: public Item_func_json_array { protected: String tmp_js1, tmp_js2; public: Item_func_json_merge(THD thd, List<Item> &list): Item_func_json_array(thd, list) {} String val_str(String ) override; LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_merge_preserve") }; return name; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_merge>(thd, this); } }; class Item_func_json_merge_patch: public Item_func_json_merge { public: Item_func_json_merge_patch(THD thd, List<Item> &list): Item_func_json_merge(thd, list) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_merge_patch") }; return name; } String val_str(String ) override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_merge_patch>(thd, this); } }; class Item_func_json_length: public Item_long_func { bool check_arguments() const override { const LEX_CSTRING name= func_name_cstring(); if (arg_count == 0 \|\| arg_count > 2) { my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str); return true; } return args[0]->check_type_can_return_text(name) \|\| (arg_count > 1 && args[1]->check_type_general_purpose_string(name)); } protected: json_path_with_flags path; String tmp_js; String tmp_path; public: Item_func_json_length(THD thd, List<Item> &list): Item_long_func(thd, list) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_length") }; return name; } bool fix_length_and_dec() override; longlong val_int() override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_length>(thd, this); } }; class Item_func_json_depth: public Item_long_func { bool check_arguments() const override { return args[0]->check_type_can_return_text(func_name_cstring()); } protected: String tmp_js; public: Item_func_json_depth(THD thd, Item js): Item_long_func(thd, js) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_depth") }; return name; } bool fix_length_and_dec() override { max_length= 10; return FALSE; } longlong val_int() override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_depth>(thd, this); } }; class Item_func_json_type: public Item_str_func { protected: String tmp_js; public: Item_func_json_type(THD thd, Item js): Item_str_func(thd, js) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_type") }; return name; } bool fix_length_and_dec() override; String val_str(String ) override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_type>(thd, this); } }; class Item_func_json_insert: public Item_json_str_multipath { protected: String tmp_js; String tmp_val; bool mode_insert, mode_replace; public: Item_func_json_insert(bool i_mode, bool r_mode, THD thd, List<Item> &list): Item_json_str_multipath(thd, list), mode_insert(i_mode), mode_replace(r_mode) {} bool fix_length_and_dec() override; String val_str(String ) override; uint get_n_paths() const override { return arg_count/2; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING json_set= {STRING_WITH_LEN("json_set") }; static LEX_CSTRING json_insert= {STRING_WITH_LEN("json_insert") }; static LEX_CSTRING json_replace= {STRING_WITH_LEN("json_replace") }; return (mode_insert ? (mode_replace ? json_set : json_insert) : json_replace); } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_insert>(thd, this); } }; class Item_func_json_remove: public Item_json_str_multipath { protected: String tmp_js; public: Item_func_json_remove(THD thd, List<Item> &list): Item_json_str_multipath(thd, list) {} bool fix_length_and_dec() override; String val_str(String ) override; uint get_n_paths() const override { return arg_count - 1; } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_remove") }; return name; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_remove>(thd, this); } }; class Item_func_json_keys: public Item_str_func { protected: json_path_with_flags path; String tmp_js, tmp_path; public: Item_func_json_keys(THD thd, List<Item> &list): Item_str_func(thd, list) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_keys") }; return name; } bool fix_length_and_dec() override; String val_str(String ) override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_keys>(thd, this); } }; class Item_func_json_search: public Item_json_str_multipath { protected: String tmp_js, tmp_path, esc_value; bool mode_one; bool ooa_constant, ooa_parsed; int escape; int n_path_found; json_path_t sav_path; int compare_json_value_wild(json_engine_t je, const String cmp_str); public: Item_func_json_search(THD thd, List<Item> &list): Item_json_str_multipath(thd, list) {} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_search") }; return name; } bool fix_fields(THD thd, Item ref) override; bool fix_length_and_dec() override; String val_str(String ) override; uint get_n_paths() const override { return arg_count > 4 ? arg_count - 4 : 0; } Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_search>(thd, this); } }; class Item_func_json_format: public Item_json_func { public: enum formats { NONE, COMPACT, LOOSE, DETAILED }; protected: formats fmt; String tmp_js; public: Item_func_json_format(THD thd, Item js, formats format): Item_json_func(thd, js), fmt(format) {} Item_func_json_format(THD thd, List<Item> &list): Item_json_func(thd, list), fmt(DETAILED) {} LEX_CSTRING func_name_cstring() const override; bool fix_length_and_dec() override; String val_str(String str) override; String val_json(String str) override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_format>(thd, this); } }; class Item_func_json_arrayagg : public Item_func_group_concat { protected: /* Overrides Item_func_group_concat::skip_nulls() NULL-s should be added to the result as JSON null value. / bool skip_nulls() const override { return false; } String get_str_from_item(Item i, String tmp) override; String get_str_from_field(Item i, Field f, String tmp, const uchar key, size_t offset) override; void cut_max_length(String result, uint old_length, uint max_length) const override; public: String m_tmp_json; /* Used in get_str_from_.. / Item_func_json_arrayagg(THD thd, Name_resolution_context context_arg, bool is_distinct, List<Item> is_select, const SQL_I_List<ORDER> &is_order, String is_separator, bool limit_clause, Item row_limit, Item offset_limit): Item_func_group_concat(thd, context_arg, is_distinct, is_select, is_order, is_separator, limit_clause, row_limit, offset_limit) { } Item_func_json_arrayagg(THD thd, Item_func_json_arrayagg item) : Item_func_group_concat(thd, item) {} const Type_handler type_handler() const override { return Type_handler_json_common::json_type_handler_sum(this); } LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_arrayagg(") }; return name; } bool fix_fields(THD thd, Item *ref) override; enum Sumfunctype sum_func() const override { return JSON_ARRAYAGG_FUNC; } String val_str(String str) override; Item copy_or_same(THD* thd) override; Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_arrayagg>(thd, this); } }; class Item_func_json_objectagg : public Item_sum { String result; public: Item_func_json_objectagg(THD thd, Item key, Item value) : Item_sum(thd, key, value) { quick_group= FALSE; result.append('{'); } Item_func_json_objectagg(THD thd, Item_func_json_objectagg item); void cleanup() override; enum Sumfunctype sum_func () const override { return JSON_OBJECTAGG_FUNC;} LEX_CSTRING func_name_cstring() const override { static LEX_CSTRING name= {STRING_WITH_LEN("json_objectagg") }; return name; } const Type_handler type_handler() const override { return Type_handler_json_common::json_type_handler_sum(this); } void clear() override; bool add() override; void reset_field() override { DBUG_ASSERT(0); } // not used void update_field() override { DBUG_ASSERT(0); } // not used bool fix_fields(THD ,Item ) override; double val_real() override { return 0.0; } longlong val_int() override { return 0; } my_decimal val_decimal(my_decimal decimal_value) override { my_decimal_set_zero(decimal_value); return decimal_value; } bool get_date(THD thd, MYSQL_TIME ltime, date_mode_t fuzzydate) override { return get_date_from_string(thd, ltime, fuzzydate); } String val_str(String* str) override; Item copy_or_same(THD thd) override; void no_rows_in_result() override {} Item do_get_copy(THD thd) const override { return get_item_copy<Item_func_json_objectagg>(thd, this); } }; extern bool is_json_type(const Item item); #endif / ITEM_JSONFUNC_INCLUDED */ Back

Edit File : item_jsonfunc.h | Size : 21.99 KB

#ifndef ITEM_JSONFUNC_INCLUDED
#define ITEM_JSONFUNC_INCLUDED

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 St, Fifth Floor, Boston, MA 02110-1301  USA */

/* This file defines all JSON functions */

#include <json_lib.h>
#include "item_cmpfunc.h"      // Item_bool_func
#include "item_strfunc.h"      // Item_str_func
#include "item_sum.h"
#include "sql_type_json.h"

class json_path_with_flags
{
public:
  json_path_t p;
  bool constant;
  bool parsed;
  json_path_step_t *cur_step;
  void set_constant_flag(bool s_constant)
  {
    constant= s_constant;
    parsed= FALSE;
  }
};

void report_path_error_ex(const char *ps, json_path_t *p,
                          const char *fname, int n_param,
                          Sql_condition::enum_warning_level lv);
void report_json_error_ex(const char *js, json_engine_t *je,
                          const char *fname, int n_param,
                          Sql_condition::enum_warning_level lv);

class Json_engine_scan: public json_engine_t
{
public:
  Json_engine_scan(CHARSET_INFO *i_cs, const uchar *str, const uchar *end)
  {
    json_scan_start(this, i_cs, str, end);
  }
  Json_engine_scan(const String &str)
   :Json_engine_scan(str.charset(), (const uchar *) str.ptr(),
                                    (const uchar *) str.end())
  { }
  bool check_and_get_value_scalar(String *res, int *error);
  bool check_and_get_value_complex(String *res, int *error);
};

class Json_path_extractor: public json_path_with_flags
{
protected:
  String tmp_js, tmp_path;
  virtual ~Json_path_extractor() { }
  virtual bool check_and_get_value(Json_engine_scan *je,
                                   String *to, int *error)=0;
  bool extract(String *to, Item *js, Item *jp, CHARSET_INFO *cs);
};

class Item_func_json_valid: public Item_bool_func
{
protected:
  String tmp_value;

public:
  Item_func_json_valid(THD *thd, Item *json) : Item_bool_func(thd, json) {}
  bool val_bool() override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_valid") };
    return name;
  }
  bool fix_length_and_dec() override
  {
    if (Item_bool_func::fix_length_and_dec())
      return TRUE;
    set_maybe_null();
    return FALSE;
  }
  bool set_format_by_check_constraint(Send_field_extended_metadata *to) const
    override
  {
    static const Lex_cstring fmt(STRING_WITH_LEN("json"));
    return to->set_format_name(fmt);
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_valid>(thd, this); }
  enum Functype functype() const override { return JSON_VALID_FUNC; }
};

class Item_func_json_exists: public Item_bool_func
{
protected:
  json_path_with_flags path;
  String tmp_js, tmp_path;

public:
  Item_func_json_exists(THD *thd, Item *js, Item *i_path):
    Item_bool_func(thd, js, i_path) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_exists") };
    return name;
  }
  bool fix_length_and_dec() override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_exists>(thd, this); }
  bool val_bool() override;
};

class Item_json_func: public Item_str_func
{
public:
  Item_json_func(THD *thd)
   :Item_str_func(thd) { }
  Item_json_func(THD *thd, Item *a)
   :Item_str_func(thd, a) { }
  Item_json_func(THD *thd, Item *a, Item *b)
   :Item_str_func(thd, a, b) { }
  Item_json_func(THD *thd, List<Item> &list)
   :Item_str_func(thd, list) { }
  const Type_handler *type_handler() const override
  {
    return Type_handler_json_common::json_type_handler(max_length);
  }
};

class Item_func_json_value: public Item_str_func,
                            public Json_path_extractor
{

public:
  Item_func_json_value(THD *thd, Item *js, Item *i_path):
    Item_str_func(thd, js, i_path) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_value") };
    return name;
  }
  bool fix_length_and_dec() override ;
  String *val_str(String *to) override
  {
    null_value= Json_path_extractor::extract(to, args[0], args[1],
                                             collation.collation);
    return null_value ? NULL : to;
  }
  bool check_and_get_value(Json_engine_scan *je,
                           String *res, int *error) override
  {
    return je->check_and_get_value_scalar(res, error);
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_value>(thd, this); }
};

class Item_func_json_query: public Item_json_func,
                            public Json_path_extractor
{
public:
  Item_func_json_query(THD *thd, Item *js, Item *i_path):
    Item_json_func(thd, js, i_path) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_query") };
    return name;
  }
  bool fix_length_and_dec() override;
  String *val_str(String *to) override
  {
    null_value= Json_path_extractor::extract(to, args[0], args[1],
                                             collation.collation);
    return null_value ? NULL : to;
  }
  bool check_and_get_value(Json_engine_scan *je,
                           String *res, int *error) override
  {
    return je->check_and_get_value_complex(res, error);
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_query>(thd, this); }
};

class Item_func_json_quote: public Item_str_func
{
protected:
  String tmp_s;

public:
  Item_func_json_quote(THD *thd, Item *s): Item_str_func(thd, s) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_quote") };
    return name;
  }
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_quote>(thd, this); }
};

class Item_func_json_unquote: public Item_str_func
{
protected:
  String tmp_s;
  String *read_json(json_engine_t *je);
public:
  Item_func_json_unquote(THD *thd, Item *s): Item_str_func(thd, s) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_unquote") };
    return name;
  }
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_unquote>(thd, this); }
};

class Item_json_str_multipath: public Item_json_func
{
protected:
  json_path_with_flags *paths;
  String *tmp_paths;
private:
  /**
    Number of paths returned by calling virtual method get_n_paths() and
    remembered inside fix_fields(). It is used by the virtual destructor
    ~Item_json_str_multipath() to iterate along allocated memory chunks stored
    in the array tmp_paths and free every of them. The virtual method
    get_n_paths() can't be used for this goal from within virtual destructor.
    We could get rid of the virtual method get_n_paths() and store the number
    of paths directly in the constructor of classes derived from the class
    Item_json_str_multipath but presence of the method get_n_paths() allows
    to check invariant that the number of arguments not changed between
    sequential runs of the same prepared statement that seems to be useful.
  */
  uint n_paths;
public:
  Item_json_str_multipath(THD *thd, List<Item> &list):
    Item_json_func(thd, list), paths(NULL), tmp_paths(0), n_paths(0) {}
  virtual ~Item_json_str_multipath();

bool fix_fields(THD *thd, Item **ref) override;
  virtual uint get_n_paths() const = 0;
};

class Item_func_json_extract: public Item_json_str_multipath
{
protected:
  String tmp_js;
public:
  String *read_json(String *str, json_value_types *type,
                    char **out_val, int *value_len);
  Item_func_json_extract(THD *thd, List<Item> &list):
    Item_json_str_multipath(thd, list) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_extract") };
    return name;
  }
  enum Functype functype() const override { return JSON_EXTRACT_FUNC; }
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  longlong val_int() override;
  double val_real() override;
  my_decimal *val_decimal(my_decimal *) override;
  uint get_n_paths() const override { return arg_count - 1; }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_extract>(thd, this); }
};

class Item_func_json_contains: public Item_bool_func
{
protected:
  String tmp_js;
  json_path_with_flags path;
  String tmp_path;
  bool a2_constant, a2_parsed;
  String tmp_val, *val;
public:
  Item_func_json_contains(THD *thd, List<Item> &list):
    Item_bool_func(thd, list) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_contains") };
    return name;
  }
  bool fix_length_and_dec() override;
  bool val_bool() override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_contains>(thd, this); }
};

class Item_func_json_contains_path: public Item_bool_func
{
protected:
  String tmp_js;
  json_path_with_flags *paths;
  String *tmp_paths;
  bool mode_one;
  bool ooa_constant, ooa_parsed;
  bool *p_found;

public:
  Item_func_json_contains_path(THD *thd, List<Item> &list):
    Item_bool_func(thd, list), tmp_paths(0) {}
  virtual ~Item_func_json_contains_path();
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_contains_path") };
    return name;
  }
  bool fix_fields(THD *thd, Item **ref) override;
  bool fix_length_and_dec() override;
  bool val_bool() override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_contains_path>(thd, this); }
};

class Item_func_json_array: public Item_json_func
{
protected:
  String tmp_val;
  ulong result_limit;
public:
  Item_func_json_array(THD *thd):
    Item_json_func(thd) {}
  Item_func_json_array(THD *thd, List<Item> &list):
    Item_json_func(thd, list) {}
  String *val_str(String *) override;
  bool fix_length_and_dec() override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_array") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_array>(thd, this); }
};

class Item_func_json_array_append: public Item_json_str_multipath
{
protected:
  String tmp_js;
  String tmp_val;
public:
  Item_func_json_array_append(THD *thd, List<Item> &list):
    Item_json_str_multipath(thd, list) {}
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  uint get_n_paths() const override { return arg_count/2; }
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_array_append") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_array_append>(thd, this); }
};

class Item_func_json_array_insert: public Item_func_json_array_append
{
public:
  Item_func_json_array_insert(THD *thd, List<Item> &list):
    Item_func_json_array_append(thd, list) {}
  String *val_str(String *) override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_array_insert") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_array_insert>(thd, this); }
};

class Item_func_json_object: public Item_func_json_array
{
public:
  Item_func_json_object(THD *thd):
    Item_func_json_array(thd) {}
  Item_func_json_object(THD *thd, List<Item> &list):
    Item_func_json_array(thd, list) {}
  String *val_str(String *) override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_object") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_object>(thd, this); }
};

class Item_func_json_merge: public Item_func_json_array
{
protected:
  String tmp_js1, tmp_js2;
public:
  Item_func_json_merge(THD *thd, List<Item> &list):
    Item_func_json_array(thd, list) {}
  String *val_str(String *) override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_merge_preserve") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_merge>(thd, this); }
};

class Item_func_json_merge_patch: public Item_func_json_merge
{
public:
  Item_func_json_merge_patch(THD *thd, List<Item> &list):
    Item_func_json_merge(thd, list) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_merge_patch") };
    return name;
  }
  String *val_str(String *) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_merge_patch>(thd, this); }
};

class Item_func_json_length: public Item_long_func
{
  bool check_arguments() const override
  {
    const LEX_CSTRING name= func_name_cstring();
    if (arg_count == 0 || arg_count > 2)
    {
      my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
      return true;
    }
    return args[0]->check_type_can_return_text(name) ||
      (arg_count > 1 && args[1]->check_type_general_purpose_string(name));
  }
protected:
  json_path_with_flags path;
  String tmp_js;
  String tmp_path;
public:
  Item_func_json_length(THD *thd, List<Item> &list):
    Item_long_func(thd, list) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_length") };
    return name;
  }
  bool fix_length_and_dec() override;
  longlong val_int() override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_length>(thd, this); }
};

class Item_func_json_depth: public Item_long_func
{
  bool check_arguments() const override
  { return args[0]->check_type_can_return_text(func_name_cstring()); }
protected:
  String tmp_js;
public:
  Item_func_json_depth(THD *thd, Item *js): Item_long_func(thd, js) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_depth") };
    return name;
  }
  bool fix_length_and_dec() override { max_length= 10; return FALSE; }
  longlong val_int() override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_depth>(thd, this); }
};

class Item_func_json_type: public Item_str_func
{
protected:
  String tmp_js;
public:
  Item_func_json_type(THD *thd, Item *js): Item_str_func(thd, js) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_type") };
    return name;
  }
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_type>(thd, this); }
};

class Item_func_json_insert: public Item_json_str_multipath
{
protected:
  String tmp_js;
  String tmp_val;
  bool mode_insert, mode_replace;
public:
  Item_func_json_insert(bool i_mode, bool r_mode, THD *thd, List<Item> &list):
    Item_json_str_multipath(thd, list),
      mode_insert(i_mode), mode_replace(r_mode) {}
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  uint get_n_paths() const override { return arg_count/2; }
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING json_set=    {STRING_WITH_LEN("json_set") };
    static LEX_CSTRING json_insert= {STRING_WITH_LEN("json_insert") };
    static LEX_CSTRING json_replace= {STRING_WITH_LEN("json_replace") };
    return (mode_insert ?
            (mode_replace ? json_set : json_insert) : json_replace);
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_insert>(thd, this); }
};

class Item_func_json_remove: public Item_json_str_multipath
{
protected:
  String tmp_js;
public:
  Item_func_json_remove(THD *thd, List<Item> &list):
    Item_json_str_multipath(thd, list) {}
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  uint get_n_paths() const override { return arg_count - 1; }
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_remove") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_remove>(thd, this); }
};

class Item_func_json_keys: public Item_str_func
{
protected:
  json_path_with_flags path;
  String tmp_js, tmp_path;

public:
  Item_func_json_keys(THD *thd, List<Item> &list):
    Item_str_func(thd, list) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_keys") };
    return name;
  }
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_keys>(thd, this); }
};

class Item_func_json_search: public Item_json_str_multipath
{
protected:
  String tmp_js, tmp_path, esc_value;
  bool mode_one;
  bool ooa_constant, ooa_parsed;
  int escape;
  int n_path_found;
  json_path_t sav_path;

int compare_json_value_wild(json_engine_t *je, const String *cmp_str);

public:
  Item_func_json_search(THD *thd, List<Item> &list):
    Item_json_str_multipath(thd, list) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_search") };
    return name;
  }
  bool fix_fields(THD *thd, Item **ref) override;
  bool fix_length_and_dec() override;
  String *val_str(String *) override;
  uint get_n_paths() const override { return arg_count > 4 ? arg_count - 4 : 0; }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_search>(thd, this); }
};

class Item_func_json_format: public Item_json_func
{
public:
  enum formats
  {
    NONE,
    COMPACT,
    LOOSE,
    DETAILED
  };
protected:
  formats fmt;
  String tmp_js;
public:
  Item_func_json_format(THD *thd, Item *js, formats format):
    Item_json_func(thd, js), fmt(format) {}
  Item_func_json_format(THD *thd, List<Item> &list):
    Item_json_func(thd, list), fmt(DETAILED) {}

LEX_CSTRING func_name_cstring() const override;
  bool fix_length_and_dec() override;
  String *val_str(String *str) override;
  String *val_json(String *str) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_format>(thd, this); }
};

class Item_func_json_arrayagg : public Item_func_group_concat
{
protected:
  /*
    Overrides Item_func_group_concat::skip_nulls()
    NULL-s should be added to the result as JSON null value.
  */
  bool skip_nulls() const override { return false; }
  String *get_str_from_item(Item *i, String *tmp) override;
  String *get_str_from_field(Item *i, Field *f, String *tmp,
                             const uchar *key, size_t offset) override;
  void cut_max_length(String *result,
                      uint old_length, uint max_length) const override;
public:
  String m_tmp_json; /* Used in get_str_from_*.. */
  Item_func_json_arrayagg(THD *thd, Name_resolution_context *context_arg,
                          bool is_distinct, List<Item> *is_select,
                          const SQL_I_List<ORDER> &is_order, String *is_separator,
                          bool limit_clause, Item *row_limit, Item *offset_limit):
      Item_func_group_concat(thd, context_arg, is_distinct, is_select, is_order,
                             is_separator, limit_clause, row_limit, offset_limit)
  {
  }
  Item_func_json_arrayagg(THD *thd, Item_func_json_arrayagg *item) :
    Item_func_group_concat(thd, item) {}
  const Type_handler *type_handler() const override
  {
    return Type_handler_json_common::json_type_handler_sum(this);
  }

LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_arrayagg(") };
    return name;
  }
  bool fix_fields(THD *thd, Item **ref) override;
  enum Sumfunctype sum_func() const override { return JSON_ARRAYAGG_FUNC; }

String* val_str(String *str) override;

Item *copy_or_same(THD* thd) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_arrayagg>(thd, this); }
};

class Item_func_json_objectagg : public Item_sum
{
  String result;
public:
  Item_func_json_objectagg(THD *thd, Item *key, Item *value) :
    Item_sum(thd, key, value)
  {
    quick_group= FALSE;
    result.append('{');
  }

Item_func_json_objectagg(THD *thd, Item_func_json_objectagg *item);
  void cleanup() override;

enum Sumfunctype sum_func () const override { return JSON_OBJECTAGG_FUNC;}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_objectagg") };
    return name;
  }
  const Type_handler *type_handler() const override
  {
    return Type_handler_json_common::json_type_handler_sum(this);
  }
  void clear() override;
  bool add() override;
  void reset_field() override { DBUG_ASSERT(0); }        // not used
  void update_field() override { DBUG_ASSERT(0); }       // not used
  bool fix_fields(THD *,Item **) override;

double val_real() override { return 0.0; }
  longlong val_int() override { return 0; }
  my_decimal *val_decimal(my_decimal *decimal_value) override
  {
    my_decimal_set_zero(decimal_value);
    return decimal_value;
  }
  bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override
  {
    return get_date_from_string(thd, ltime, fuzzydate);
  }
  String* val_str(String* str) override;
  Item *copy_or_same(THD* thd) override;
  void no_rows_in_result() override {}
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_objectagg>(thd, this); }
};

extern bool is_json_type(const Item *item);

#endif /* ITEM_JSONFUNC_INCLUDED */

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