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?? ..
?? aligned.h(1.11 KB)
?? aria_backup.h(1.51 KB)
?? assume_aligned.h(2.29 KB)
?? atomic
?? authors.h(9.9 KB)
?? backup.h(1.66 KB)
?? bounded_queue.h(5.95 KB)
?? char_buffer.h(3.09 KB)
?? charset_collations.h(6.41 KB)
?? client_settings.h(1.87 KB)
?? compat56.h(2.23 KB)
?? config.h(14.21 KB)
?? contributors.h(4.76 KB)
?? create_options.h(4.09 KB)
?? create_tmp_table.h(2.74 KB)
?? cset_narrowing.h(3.88 KB)
?? custom_conf.h(1.06 KB)
?? data
?? datadict.h(1.66 KB)
?? ddl_log.h(12.51 KB)
?? debug.h(1.26 KB)
?? debug_sync.h(2 KB)
?? deprecation.h(2.74 KB)
?? derived_handler.h(2.32 KB)
?? derror.h(980 B)
?? des_key_file.h(1.21 KB)
?? discover.h(1.53 KB)
?? dur_prop.h(1.06 KB)
?? embedded_priv.h(1.69 KB)
?? event_data_objects.h(4.09 KB)
?? event_db_repository.h(3.56 KB)
?? event_parse_data.h(2.83 KB)
?? event_queue.h(3.36 KB)
?? event_scheduler.h(3.21 KB)
?? events.h(4.6 KB)
?? field.h(217.81 KB)
?? field_comp.h(1.15 KB)
?? filesort.h(7.13 KB)
?? filesort_utils.h(10.53 KB)
?? ft_global.h(3.04 KB)
?? gcalc_slicescan.h(16.87 KB)
?? gcalc_tools.h(11.62 KB)
?? grant.h(2.69 KB)
?? group_by_handler.h(3.45 KB)
?? gstream.h(2.38 KB)
?? gtid_index.h(19.54 KB)
?? ha_handler_stats.h(2.28 KB)
?? ha_partition.h(63.36 KB)
?? ha_sequence.h(6.1 KB)
?? handle_connections_win.h(884 B)
?? handler.h(206.19 KB)
?? hash.h(4.35 KB)
?? hash_filo.h(5.55 KB)
?? heap.h(9.26 KB)
?? hostname.h(5.29 KB)
?? ilist.h(6.98 KB)
?? init.h(852 B)
?? innodb_priv.h(1.29 KB)
?? item.h(276.43 KB)
?? item_cmpfunc.h(132.01 KB)
?? item_create.h(11.24 KB)
?? item_func.h(134.64 KB)
?? item_geofunc.h(38.16 KB)
?? item_jsonfunc.h(27.86 KB)
?? item_row.h(5.1 KB)
?? item_strfunc.h(75.33 KB)
?? item_subselect.h(57.63 KB)
?? item_sum.h(70.69 KB)
?? item_timefunc.h(63.85 KB)
?? item_vers.h(4.26 KB)
?? item_windowfunc.h(33.56 KB)
?? item_xmlfunc.h(4.52 KB)
?? json_schema.h(25.1 KB)
?? json_schema_helper.h(1.13 KB)
?? json_table.h(9.44 KB)
?? key.h(2.08 KB)
?? keycaches.h(1.94 KB)
?? lex.h(29.54 KB)
?? lex_charset.h(25.92 KB)
?? lex_hash.h(141.94 KB)
?? lex_ident.h(5.15 KB)
?? lex_string.h(4.77 KB)
?? lex_symbol.h(1.29 KB)
?? lex_token.h(42.01 KB)
?? lf.h(6.31 KB)
?? lock.h(2.2 KB)
?? log.h(51.28 KB)
?? log_cache.h(7.57 KB)
?? log_event.h(172.56 KB)
?? log_event_data_type.h(1.85 KB)
?? log_slow.h(2.38 KB)
?? maria.h(5.73 KB)
?? mariadb.h(1.25 KB)
?? mdl.h(37.65 KB)
?? mem_root_array.h(6.94 KB)
?? message.h(1.17 KB)
?? multi_range_read.h(22.65 KB)
?? my_apc.h(4.64 KB)
?? my_atomic.h(7.11 KB)
?? my_atomic_wrapper.h(2.98 KB)
?? my_base.h(27.28 KB)
?? my_bit.h(6.05 KB)
?? my_bitmap.h(5.37 KB)
?? my_check_opt.h(2.56 KB)
?? my_compare.h(10.87 KB)
?? my_counter.h(1.68 KB)
?? my_cpu.h(4.74 KB)
?? my_crypt.h(904 B)
?? my_decimal.h(14.15 KB)
?? my_default.h(1.84 KB)
?? my_handler_errors.h(4.77 KB)
?? my_json_writer.h(18.14 KB)
?? my_libwrap.h(1.16 KB)
?? my_md5.h(1.45 KB)
?? my_minidump.h(848 B)
?? my_nosys.h(1.4 KB)
?? my_rdtsc.h(9.88 KB)
?? my_rnd.h(1014 B)
?? my_service_manager.h(2.07 KB)
?? my_stack_alloc.h(6.34 KB)
?? my_stacktrace.h(3.14 KB)
?? my_time.h(10.17 KB)
?? my_tracker.h(1.37 KB)
?? my_tree.h(3.9 KB)
?? my_uctype.h(67.9 KB)
?? my_user.h(1.1 KB)
?? my_virtual_mem.h(1.1 KB)
?? myisam.h(17.18 KB)
?? myisamchk.h(4.62 KB)
?? myisammrg.h(4.78 KB)
?? myisampack.h(14.58 KB)
?? mysqld.h(41.11 KB)
?? mysqld_default_groups.h(204 B)
?? mysqld_suffix.h(1.17 KB)
?? mysys_err.h(2.99 KB)
?? opt_histogram_json.h(4.71 KB)
?? opt_range.h(64.78 KB)
?? opt_rewrite_date_cmp.h(3.84 KB)
?? opt_subselect.h(14.78 KB)
?? opt_trace.h(8.29 KB)
?? opt_trace_context.h(3.21 KB)
?? optimizer_costs.h(5.89 KB)
?? optimizer_defaults.h(7.37 KB)
?? parse_file.h(4.28 KB)
?? partition_element.h(5.3 KB)
?? partition_info.h(19.4 KB)
?? password.h(1.14 KB)
?? pfs_file_provider.h(3.08 KB)
?? pfs_idle_provider.h(1.35 KB)
?? pfs_memory_provider.h(1.59 KB)
?? pfs_metadata_provider.h(1.85 KB)
?? pfs_socket_provider.h(2.21 KB)
?? pfs_stage_provider.h(1.52 KB)
?? pfs_statement_provider.h(4.25 KB)
?? pfs_table_provider.h(2.56 KB)
?? pfs_thread_provider.h(5.43 KB)
?? pfs_transaction_provider.h(2.78 KB)
?? privilege.h(28.44 KB)
?? probes_mysql.h(973 B)
?? probes_mysql_dtrace.h(32.23 KB)
?? probes_mysql_nodtrace.h(5.94 KB)
?? procedure.h(6.63 KB)
?? protocol.h(12.27 KB)
?? providers
?? proxy_protocol.h(548 B)
?? queues.h(3.4 KB)
?? records.h(3.07 KB)
?? repl_failsafe.h(1.55 KB)
?? replication.h(15.2 KB)
?? rijndael.h(1.67 KB)
?? rowid_filter.h(16.03 KB)
?? rpl_constants.h(3.28 KB)
?? rpl_filter.h(4.66 KB)
?? rpl_gtid.h(29.95 KB)
?? rpl_injector.h(9.4 KB)
?? rpl_mi.h(16.29 KB)
?? rpl_parallel.h(17.8 KB)
?? rpl_record.h(1.49 KB)
?? rpl_reporting.h(3.63 KB)
?? rpl_rli.h(35.02 KB)
?? rpl_tblmap.h(3.1 KB)
?? rpl_utility.h(10.93 KB)
?? scheduler.h(3.12 KB)
?? scope.h(4.29 KB)
?? select_handler.h(3.34 KB)
?? semisync.h(2.23 KB)
?? semisync_master.h(25.16 KB)
?? semisync_master_ack_receiver.h(8.5 KB)
?? semisync_slave.h(3.65 KB)
?? service_versions.h(2.23 KB)
?? session_tracker.h(13.75 KB)
?? set_var.h(16.39 KB)
?? simple_tokenizer.h(1.97 KB)
?? slave.h(11.99 KB)
?? socketpair.h(842 B)
?? source_revision.h(67 B)
?? sp.h(23.11 KB)
?? sp_cache.h(1.99 KB)
?? sp_head.h(38.61 KB)
?? sp_instr.h(40.41 KB)
?? sp_pcontext.h(24.71 KB)
?? sp_rcontext.h(14.08 KB)
?? span.h(3.84 KB)
?? spatial.h(21.78 KB)
?? sql_acl.h(13.75 KB)
?? sql_admin.h(2.85 KB)
?? sql_alloc.h(1.69 KB)
?? sql_alter.h(15.08 KB)
?? sql_analyse.h(10.86 KB)
?? sql_analyze_stmt.h(12.4 KB)
?? sql_array.h(6.97 KB)
?? sql_audit.h(13.83 KB)
?? sql_base.h(25.87 KB)
?? sql_basic_types.h(9.3 KB)
?? sql_binlog.h(895 B)
?? sql_bitmap.h(7.88 KB)
?? sql_bootstrap.h(1.77 KB)
?? sql_cache.h(21.34 KB)
?? sql_callback.h(1.51 KB)
?? sql_class.h(270.56 KB)
?? sql_cmd.h(15.11 KB)
?? sql_connect.h(3.96 KB)
?? sql_const.h(10.07 KB)
?? sql_crypt.h(1.4 KB)
?? sql_cte.h(16.15 KB)
?? sql_cursor.h(4.14 KB)
?? sql_db.h(2.28 KB)
?? sql_debug.h(5.51 KB)
?? sql_delete.h(3.52 KB)
?? sql_derived.h(1.26 KB)
?? sql_digest.h(3.73 KB)
?? sql_digest_stream.h(1.53 KB)
?? sql_do.h(954 B)
?? sql_error.h(39.39 KB)
?? sql_explain.h(30.39 KB)
?? sql_expression_cache.h(4.26 KB)
?? sql_get_diagnostics.h(7.7 KB)
?? sql_handler.h(2.84 KB)
?? sql_help.h(995 B)
?? sql_hset.h(3.32 KB)
?? sql_i_s.h(8.29 KB)
?? sql_insert.h(5.05 KB)
?? sql_join_cache.h(47.52 KB)
?? sql_lex.h(174.22 KB)
?? sql_lifo_buffer.h(9.45 KB)
?? sql_limit.h(3.11 KB)
?? sql_list.h(21.87 KB)
?? sql_load.h(1.25 KB)
?? sql_locale.h(3.16 KB)
?? sql_manager.h(960 B)
?? sql_mode.h(6.58 KB)
?? sql_parse.h(8.31 KB)
?? sql_partition.h(12.38 KB)
?? sql_partition_admin.h(5.8 KB)
?? sql_plist.h(7.53 KB)
?? sql_plugin.h(7.4 KB)
?? sql_plugin_compat.h(2.18 KB)
?? sql_prepare.h(11.4 KB)
?? sql_priv.h(15.08 KB)
?? sql_profile.h(7.63 KB)
?? sql_reload.h(1.01 KB)
?? sql_rename.h(982 B)
?? sql_repl.h(2.99 KB)
?? sql_schema.h(3.23 KB)
?? sql_select.h(91 KB)
?? sql_sequence.h(5.06 KB)
?? sql_servers.h(1.74 KB)
?? sql_show.h(9.73 KB)
?? sql_signal.h(3.28 KB)
?? sql_sort.h(21.96 KB)
?? sql_statistics.h(16.41 KB)
?? sql_string.h(37.92 KB)
?? sql_table.h(9.52 KB)
?? sql_test.h(1.55 KB)
?? sql_time.h(7.24 KB)
?? sql_trigger.h(11.88 KB)
?? sql_truncate.h(2.03 KB)
?? sql_tvc.h(2.36 KB)
?? sql_type.h(291.25 KB)
?? sql_type_fixedbin.h(63.94 KB)
?? sql_type_fixedbin_storage.h(5.34 KB)
?? sql_type_geom.h(18.59 KB)
?? sql_type_int.h(9.77 KB)
?? sql_type_json.h(6.01 KB)
?? sql_type_real.h(1.23 KB)
?? sql_type_string.h(1.59 KB)
?? sql_type_timeofday.h(2.26 KB)
?? sql_udf.h(4.74 KB)
?? sql_union.h(1.04 KB)
?? sql_update.h(3.55 KB)
?? sql_used.h(1.02 KB)
?? sql_view.h(2.41 KB)
?? sql_window.h(6.65 KB)
?? ssl_compat.h(3.3 KB)
?? strfunc.h(2.22 KB)
?? structs.h(30.55 KB)
?? sys_vars_shared.h(2.67 KB)
?? t_ctype.h(5.51 KB)
?? table.h(118.11 KB)
?? table_cache.h(4.13 KB)
?? thr_lock.h(7.06 KB)
?? thr_malloc.h(1.17 KB)
?? thr_timer.h(1.53 KB)
?? thread_cache.h(5.77 KB)
?? threadpool.h(4.7 KB)
?? threadpool_generic.h(3.88 KB)
?? threadpool_winsockets.h(2.24 KB)
?? transaction.h(1.43 KB)
?? tzfile.h(4.9 KB)
?? tztime.h(3.65 KB)
?? uniques.h(4.13 KB)
?? unireg.h(7.76 KB)
?? vers_string.h(2.39 KB)
?? violite.h(9.85 KB)
?? waiting_threads.h(4.43 KB)
?? welcome_copyright_notice.h(1.42 KB)
?? winservice.h(5.88 KB)
?? wqueue.h(1.53 KB)
?? wsrep.h(3.23 KB)
?? wsrep_allowlist_service.h(1.01 KB)
?? wsrep_applier.h(2.64 KB)
?? wsrep_binlog.h(3.36 KB)
?? wsrep_client_service.h(2.5 KB)
?? wsrep_client_state.h(1.53 KB)
?? wsrep_condition_variable.h(1.45 KB)
?? wsrep_event_service.h(1.32 KB)
?? wsrep_high_priority_service.h(4.8 KB)
?? wsrep_mutex.h(1.21 KB)
?? wsrep_mysqld.h(20.93 KB)
?? wsrep_mysqld_c.h(1.2 KB)
?? wsrep_on.h(1.68 KB)
?? wsrep_plugin.h(1.35 KB)
?? wsrep_priv.h(1.6 KB)
?? wsrep_schema.h(5.48 KB)
?? wsrep_server_service.h(3.55 KB)
?? wsrep_server_state.h(3.06 KB)
?? wsrep_sst.h(3.86 KB)
?? wsrep_status.h(1.93 KB)
?? wsrep_storage_service.h(1.77 KB)
?? wsrep_thd.h(10.9 KB)
?? wsrep_trans_observer.h(17.75 KB)
?? wsrep_types.h(1.08 KB)
?? wsrep_utils.h(9.58 KB)
?? wsrep_var.h(4.25 KB)
?? wsrep_xid.h(1.51 KB)
?? xa.h(1.86 KB)

Editing: item_jsonfunc.h

#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"
#include "json_schema.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,
                                  json_value_types cur_value_type=
                                                    JSON_VALUE_UNINITIALIZED);
};

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(THD *thd) override
  {
    if (Item_bool_func::fix_length_and_dec(thd))
      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_equals: public Item_bool_func
{
public:
  Item_func_json_equals(THD *thd, Item *a, Item *b):
    Item_bool_func(thd, a, b) {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_equals") };
    return name;
  }
  bool fix_length_and_dec(THD *thd) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_equals>(thd, this); }
  bool val_bool() override;
};

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(THD *thd) 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(THD *thd) 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(THD *thd) 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, JSON_VALUE_UNINITIALIZED);
  }
  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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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_normalize: public Item_json_func
{
public:
  Item_func_json_normalize(THD *thd, Item *a):
    Item_json_func(thd, a) {}
  String *val_str(String *) override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_normalize") };
    return name;
  }
  bool fix_length_and_dec(THD *thd) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_normalize>(thd, this); }
};

class Item_func_json_object_to_array: public Item_json_func
{
  protected:
  String tmp;
public:
  Item_func_json_object_to_array(THD *thd, Item *a):
    Item_json_func(thd, a) {}
  String *val_str(String *) override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_object_to_array") };
    return name;
  }
  bool fix_length_and_dec(THD *thd) override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_object_to_array>(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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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(THD *thd) 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);

class Item_func_json_overlaps: public Item_bool_func
{
  String tmp_js;
  bool a2_constant, a2_parsed;
  String tmp_val, *val;
public:
  Item_func_json_overlaps(THD *thd, Item *a, Item *b):
    Item_bool_func(thd, a, b)
    {}
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_overlaps") };
    return name;
  }
  bool fix_length_and_dec(THD *thd) override;
  bool val_bool() override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_overlaps>(thd, this); }
};

class Item_func_json_schema_valid: public Item_bool_func
{
  String tmp_js;
  bool schema_parsed;
  String tmp_val, *val;
  List<Json_schema_keyword> keyword_list;
  List<Json_schema_keyword> all_keywords;

public:
  Item_func_json_schema_valid(THD *thd, Item *a, Item *b):
    Item_bool_func(thd, a, b)
    {
      val= NULL;
      schema_parsed= false;
      set_maybe_null();
    }
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_schema_valid") };
    return name;
  }
  bool fix_length_and_dec(THD *thd) override;
  bool val_bool() override;
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_schema_valid>(thd, this); }
  void cleanup() override;
};

class Item_func_json_key_value: public Item_json_func,
                            public Json_path_extractor
{

String tmp_str;

public:
  Item_func_json_key_value(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_key_value") };
    return name;
  }
  bool fix_length_and_dec(THD *thd) override;
  String *val_str(String *to) override;
  bool check_and_get_value(Json_engine_scan *je,
                           String *res, int *error) override
  {
    return je->check_and_get_value_complex(res, error, JSON_VALUE_OBJECT);
  }
  bool get_key_value(json_engine_t *je, String *str);
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_key_value>(thd, this); }
};

class Item_func_json_array_intersect: public Item_str_func
{
protected:
  String tmp_js1, tmp_js2, temp_str;
  bool item_hash_inited, seen_hash_inited, root_inited;
  HASH items, seen;
  MEM_ROOT hash_root;
  bool parse_for_each_row;
public:
  Item_func_json_array_intersect(THD *thd, Item *a, Item *b):
    Item_str_func(thd, a, b)
    { item_hash_inited= seen_hash_inited= root_inited= parse_for_each_row= false; }
  String *val_str(String *) override;
  bool fix_length_and_dec(THD *thd) override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_array_intersect") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_array_intersect>(thd, this); }
  void cleanup() override
  {
    Item_str_func::cleanup();
    if (item_hash_inited)
      my_hash_free(&items);
    if (seen_hash_inited)
      my_hash_free(&seen);
    if (root_inited)
      free_root(&hash_root, MYF(0));
  }
  bool prepare_json_and_create_hash(json_engine_t *je1, String *js);
  bool get_intersect_between_arrays(String *str, json_engine_t *value,
                                         HASH *items, HASH *seen);
};

class Item_func_json_object_filter_keys: public Item_str_func
{
protected:
  String tmp_js1, tmp_js2;
  bool hash_inited, root_inited;
  HASH items;
  MEM_ROOT hash_root;
public:
  Item_func_json_object_filter_keys(THD *thd, Item *a, Item *b):
    Item_str_func(thd, a, b) { hash_inited= root_inited= false; }
  String *val_str(String *) override;
  bool fix_length_and_dec(THD *thd) override;
  LEX_CSTRING func_name_cstring() const override
  {
    static LEX_CSTRING name= {STRING_WITH_LEN("json_object_filter_keys") };
    return name;
  }
  Item *do_get_copy(THD *thd) const override
  { return get_item_copy<Item_func_json_object_filter_keys>(thd, this); }

void cleanup() override
  {
    Item_str_func::cleanup();
    if (hash_inited)
      my_hash_free(&items);
    if (root_inited)
      free_root(&hash_root, MYF(0));
  }
};

#endif /* ITEM_JSONFUNC_INCLUDED */

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