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diff --git a/contrib/libs/libmysql_r/include/mysql_com.h b/contrib/libs/libmysql_r/include/mysql_com.h
new file mode 100644
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+++ b/contrib/libs/libmysql_r/include/mysql_com.h
@@ -0,0 +1,1089 @@
+/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License, version 2.0,
+   as published by the Free Software Foundation.
+
+   This program is also distributed with certain software (including
+   but not limited to OpenSSL) that is licensed under separate terms,
+   as designated in a particular file or component or in included license
+   documentation.  The authors of MySQL hereby grant you an additional
+   permission to link the program and your derivative works with the
+   separately licensed software that they have included with MySQL.
+
+   Without limiting anything contained in the foregoing, this file,
+   which is part of C Driver for MySQL (Connector/C), is also subject to the
+   Universal FOSS Exception, version 1.0, a copy of which can be found at
+   http://oss.oracle.com/licenses/universal-foss-exception.
+
+   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, version 2.0, 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 */
+
+/**
+  @file include/mysql_com.h
+  Common definition between mysql server & client.
+*/
+
+#ifndef _mysql_com_h
+#define _mysql_com_h
+
+#ifndef MYSQL_ABI_CHECK
+#include <stdbool.h>
+#endif
+
+#include "my_command.h"
+
+/*
+  We need a definition for my_socket. On the client, <mysql.h> already provides
+  it, but on the server side, we need to get it from a header.
+*/
+#ifndef my_socket_defined
+#include "my_io.h"
+#endif
+
+#ifndef MYSQL_ABI_CHECK
+#include <stdbool.h>
+#endif
+
+#define SYSTEM_CHARSET_MBMAXLEN 3
+#define FILENAME_CHARSET_MBMAXLEN 5
+#define NAME_CHAR_LEN 64 /**< Field/table name length */
+#define PARTITION_EXPR_CHAR_LEN                \
+  2048 /**< Maximum expression length in chars \
+        */
+#define USERNAME_CHAR_LENGTH 32
+#define USERNAME_CHAR_LENGTH_STR "32"
+#ifndef NAME_LEN
+#define NAME_LEN (NAME_CHAR_LEN * SYSTEM_CHARSET_MBMAXLEN)
+#endif
+#define USERNAME_LENGTH (USERNAME_CHAR_LENGTH * SYSTEM_CHARSET_MBMAXLEN)
+#define CONNECT_STRING_MAXLEN 1024
+
+#define MYSQL_AUTODETECT_CHARSET_NAME "auto"
+
+#define SERVER_VERSION_LENGTH 60
+#define SQLSTATE_LENGTH 5
+
+/**
+  Maximum length of comments
+
+  pre 5.6: 60 characters
+*/
+#define TABLE_COMMENT_INLINE_MAXLEN 180
+#define TABLE_COMMENT_MAXLEN 2048
+#define COLUMN_COMMENT_MAXLEN 1024
+#define INDEX_COMMENT_MAXLEN 1024
+#define TABLE_PARTITION_COMMENT_MAXLEN 1024
+#define TABLESPACE_COMMENT_MAXLEN 2048
+
+/**
+  Maximum length of protocol packet.
+  @ref page_protocol_basic_ok_packet length limit also restricted to this value
+  as any length greater than this value will have first byte of
+  @ref page_protocol_basic_ok_packet to be 254 thus does not
+  provide a means to identify if this is @ref page_protocol_basic_ok_packet or
+  @ref page_protocol_basic_eof_packet.
+*/
+#define MAX_PACKET_LENGTH (256L * 256L * 256L - 1)
+
+#define LOCAL_HOST "localhost"
+#define LOCAL_HOST_NAMEDPIPE "."
+
+#if defined(_WIN32)
+#define MYSQL_NAMEDPIPE "MySQL"
+#define MYSQL_SERVICENAME "MySQL"
+#endif /* _WIN32 */
+
+/** The length of the header part for each generated column in the .frm file.*/
+#define FRM_GCOL_HEADER_SIZE 4
+/**
+  Maximum length of the expression statement defined for generated columns.
+*/
+#define GENERATED_COLUMN_EXPRESSION_MAXLEN 65535 - FRM_GCOL_HEADER_SIZE
+/**
+  Length of random string sent by server on handshake; this is also length of
+  obfuscated password, received from client
+*/
+#define SCRAMBLE_LENGTH 20
+#define AUTH_PLUGIN_DATA_PART_1_LENGTH 8
+/** length of password stored in the db: new passwords are preceeded with '*'*/
+#define SCRAMBLED_PASSWORD_CHAR_LENGTH (SCRAMBLE_LENGTH * 2 + 1)
+
+/**
+   @defgroup group_cs_column_definition_flags Column Definition Flags
+   @ingroup group_cs
+
+   @brief Values for the flags bitmask used by ::Send_field:flags
+
+   Currently need to fit into 32 bits.
+
+   Each bit represents an optional feature of the protocol.
+
+   Both the client and the server are sending these.
+
+   The intersection of the two determines what optional parts of the
+   protocol will be used.
+*/
+
+/**
+  @addtogroup group_cs_column_definition_flags
+  @{
+*/
+
+#define NOT_NULL_FLAG 1     /**< Field can't be NULL */
+#define PRI_KEY_FLAG 2      /**< Field is part of a primary key */
+#define UNIQUE_KEY_FLAG 4   /**< Field is part of a unique key */
+#define MULTIPLE_KEY_FLAG 8 /**< Field is part of a key */
+#define BLOB_FLAG 16        /**< Field is a blob */
+#define UNSIGNED_FLAG 32    /**< Field is unsigned */
+#define ZEROFILL_FLAG 64    /**< Field is zerofill */
+#define BINARY_FLAG 128     /**< Field is binary   */
+
+/* The following are only sent to new clients */
+#define ENUM_FLAG 256              /**< field is an enum */
+#define AUTO_INCREMENT_FLAG 512    /**< field is a autoincrement field */
+#define TIMESTAMP_FLAG 1024        /**< Field is a timestamp */
+#define SET_FLAG 2048              /**< field is a set */
+#define NO_DEFAULT_VALUE_FLAG 4096 /**< Field doesn't have default value */
+#define ON_UPDATE_NOW_FLAG 8192    /**< Field is set to NOW on UPDATE */
+#define NUM_FLAG 32768             /**< Field is num (for clients) */
+#define PART_KEY_FLAG 16384        /**< Intern; Part of some key */
+#define GROUP_FLAG 32768           /**< Intern: Group field */
+#define UNIQUE_FLAG 65536          /**< Intern: Used by sql_yacc */
+#define BINCMP_FLAG 131072         /**< Intern: Used by sql_yacc */
+#define GET_FIXED_FIELDS_FLAG                                                  \
+  (1 << 18)                               /**< Used to get fields in item tree \
+                                           */
+#define FIELD_IN_PART_FUNC_FLAG (1 << 19) /**< Field part of partition func */
+/**
+  Intern: Field in TABLE object for new version of altered table,
+          which participates in a newly added index.
+*/
+#define FIELD_IN_ADD_INDEX (1 << 20)
+#define FIELD_IS_RENAMED (1 << 21)   /**< Intern: Field is being renamed */
+#define FIELD_FLAGS_STORAGE_MEDIA 22 /**< Field storage media, bit 22-23 */
+#define FIELD_FLAGS_STORAGE_MEDIA_MASK (3 << FIELD_FLAGS_STORAGE_MEDIA)
+#define FIELD_FLAGS_COLUMN_FORMAT 24 /**< Field column format, bit 24-25 */
+#define FIELD_FLAGS_COLUMN_FORMAT_MASK (3 << FIELD_FLAGS_COLUMN_FORMAT)
+#define FIELD_IS_DROPPED (1 << 26) /**< Intern: Field is being dropped */
+#define EXPLICIT_NULL_FLAG                        \
+  (1 << 27) /**< Field is explicitly specified as \
+               NULL by the user */
+#define FIELD_IS_MARKED                   \
+  (1 << 28) /**< Intern: field is marked, \
+                 general purpose */
+
+/** Field will not be loaded in secondary engine. */
+#define NOT_SECONDARY_FLAG (1 << 29)
+
+/** @}*/
+
+/**
+   @defgroup group_cs_com_refresh_flags COM_REFRESH Flags
+   @ingroup group_cs
+
+   @brief Values for the `sub_command` in ::COM_REFRESH
+
+   Currently the protocol carries only 8 bits of these flags.
+
+   The rest (8-end) are used only internally in the server.
+*/
+
+/**
+  @addtogroup group_cs_com_refresh_flags
+  @{
+*/
+
+#define REFRESH_GRANT 1    /**< Refresh grant tables, FLUSH PRIVILEGES */
+#define REFRESH_LOG 2      /**< Start on new log file, FLUSH LOGS */
+#define REFRESH_TABLES 4   /**< close all tables, FLUSH TABLES */
+#define REFRESH_HOSTS 8    /**< Flush host cache, FLUSH HOSTS */
+#define REFRESH_STATUS 16  /**< Flush status variables, FLUSH STATUS */
+#define REFRESH_THREADS 32 /**< Flush thread cache */
+#define REFRESH_SLAVE                         \
+  64 /**< Reset master info and restart slave \
+        thread, RESET SLAVE */
+#define REFRESH_MASTER                                                 \
+  128                            /**< Remove all bin logs in the index \
+                                    and truncate the index, RESET MASTER */
+#define REFRESH_ERROR_LOG 256    /**< Rotate only the erorr log */
+#define REFRESH_ENGINE_LOG 512   /**< Flush all storage engine logs */
+#define REFRESH_BINARY_LOG 1024  /**< Flush the binary log */
+#define REFRESH_RELAY_LOG 2048   /**< Flush the relay log */
+#define REFRESH_GENERAL_LOG 4096 /**< Flush the general log */
+#define REFRESH_SLOW_LOG 8192    /**< Flush the slow query log */
+#define REFRESH_READ_LOCK 16384  /**< Lock tables for read. */
+/**
+  Wait for an impending flush before closing the tables.
+
+  @sa REFRESH_READ_LOCK, handle_reload_request, close_cached_tables
+*/
+#define REFRESH_FAST 32768
+#define REFRESH_USER_RESOURCES 0x80000L   /** FLISH RESOUCES. @sa ::reset_mqh */
+#define REFRESH_FOR_EXPORT 0x100000L      /** FLUSH TABLES ... FOR EXPORT */
+#define REFRESH_OPTIMIZER_COSTS 0x200000L /** FLUSH OPTIMIZER_COSTS */
+#define REFRESH_PERSIST 0x400000L         /** RESET PERSIST */
+
+/** @}*/
+
+/**
+   @defgroup group_cs_capabilities_flags Capabilities Flags
+   @ingroup group_cs
+
+   @brief Values for the capabilities flag bitmask used by the MySQL protocol
+
+   Currently need to fit into 32 bits.
+
+   Each bit represents an optional feature of the protocol.
+
+   Both the client and the server are sending these.
+
+   The intersection of the two determines whast optional parts of the
+   protocol will be used.
+*/
+
+/**
+  @addtogroup group_cs_capabilities_flags
+  @{
+*/
+
+/**
+  Use the improved version of Old Password Authentication.
+
+  Not used.
+
+  @note Assumed to be set since 4.1.1.
+*/
+#define CLIENT_LONG_PASSWORD 1
+/**
+  Send found rows instead of affected rows in @ref
+  page_protocol_basic_eof_packet
+*/
+#define CLIENT_FOUND_ROWS 2
+/**
+  @brief Get all column flags
+
+  Longer flags in Protocol::ColumnDefinition320.
+
+  @todo Reference Protocol::ColumnDefinition320
+
+  Server
+  ------
+
+  Supports longer flags.
+
+  Client
+  ------
+
+  Expects longer flags.
+*/
+#define CLIENT_LONG_FLAG 4
+/**
+  Database (schema) name can be specified on connect in Handshake Response
+  Packet.
+
+  @todo Reference Handshake Response Packet.
+
+  Server
+  ------
+
+  Supports schema-name in Handshake Response Packet.
+
+  Client
+  ------
+
+  Handshake Response Packet contains a schema-name.
+
+  @sa send_client_reply_packet()
+*/
+#define CLIENT_CONNECT_WITH_DB 8
+#define CLIENT_NO_SCHEMA 16 /**< Don't allow database.table.column */
+/**
+  Compression protocol supported.
+
+  @todo Reference Compression
+
+  Server
+  ------
+
+  Supports compression.
+
+  Client
+  ------
+
+  Switches to Compression compressed protocol after successful authentication.
+*/
+#define CLIENT_COMPRESS 32
+/**
+  Special handling of ODBC behavior.
+
+  @note No special behavior since 3.22.
+*/
+#define CLIENT_ODBC 64
+/**
+  Can use LOAD DATA LOCAL.
+
+  Server
+  ------
+
+  Enables the LOCAL INFILE request of LOAD DATA|XML.
+
+  Client
+  ------
+
+  Will handle LOCAL INFILE request.
+*/
+#define CLIENT_LOCAL_FILES 128
+/**
+  Ignore spaces before '('
+
+  Server
+  ------
+
+  Parser can ignore spaces before '('.
+
+  Client
+  ------
+
+  Let the parser ignore spaces before '('.
+*/
+#define CLIENT_IGNORE_SPACE 256
+/**
+  New 4.1 protocol
+
+  @todo Reference the new 4.1 protocol
+
+  Server
+  ------
+
+  Supports the 4.1 protocol.
+
+  Client
+  ------
+
+  Uses the 4.1 protocol.
+
+  @note this value was CLIENT_CHANGE_USER in 3.22, unused in 4.0
+*/
+#define CLIENT_PROTOCOL_41 512
+/**
+  This is an interactive client
+
+  Use @ref System_variables::net_wait_timeout
+  versus @ref System_variables::net_interactive_timeout.
+
+  Server
+  ------
+
+  Supports interactive and noninteractive clients.
+
+  Client
+  ------
+
+  Client is interactive.
+
+  @sa mysql_real_connect()
+*/
+#define CLIENT_INTERACTIVE 1024
+/**
+  Use SSL encryption for the session
+
+  @todo Reference SSL
+
+  Server
+  ------
+
+  Supports SSL
+
+  Client
+  ------
+
+  Switch to SSL after sending the capability-flags.
+*/
+#define CLIENT_SSL 2048
+/**
+  Client only flag. Not used.
+
+  Client
+  ------
+
+  Do not issue SIGPIPE if network failures occur (libmysqlclient only).
+
+  @sa mysql_real_connect()
+*/
+#define CLIENT_IGNORE_SIGPIPE 4096
+/**
+  Client knows about transactions
+
+  Server
+  ------
+
+  Can send status flags in @ref page_protocol_basic_ok_packet /
+  @ref page_protocol_basic_eof_packet.
+
+  Client
+  ------
+
+  Expects status flags in @ref page_protocol_basic_ok_packet /
+  @ref page_protocol_basic_eof_packet.
+
+  @note This flag is optional in 3.23, but always set by the server since 4.0.
+  @sa send_server_handshake_packet(), parse_client_handshake_packet(),
+  net_send_ok(), net_send_eof()
+*/
+#define CLIENT_TRANSACTIONS 8192
+#define CLIENT_RESERVED 16384 /**< DEPRECATED: Old flag for 4.1 protocol  */
+#define CLIENT_RESERVED2                                 \
+  32768 /**< DEPRECATED: Old flag for 4.1 authentication \
+           CLIENT_SECURE_CONNECTION */
+/**
+  Enable/disable multi-stmt support
+
+  Also sets @ref CLIENT_MULTI_RESULTS. Currently not checked anywhere.
+
+  Server
+  ------
+
+  Can handle multiple statements per COM_QUERY and COM_STMT_PREPARE.
+
+  Client
+  -------
+
+  May send multiple statements per COM_QUERY and COM_STMT_PREPARE.
+
+  @note Was named ::CLIENT_MULTI_QUERIES in 4.1.0, renamed later.
+
+  Requires
+  --------
+
+  ::CLIENT_PROTOCOL_41
+
+  @todo Reference COM_QUERY and COM_STMT_PREPARE
+*/
+#define CLIENT_MULTI_STATEMENTS (1UL << 16)
+/**
+  Enable/disable multi-results
+
+  Server
+  ------
+
+  Can send multiple resultsets for COM_QUERY.
+  Error if the server needs to send them and client
+  does not support them.
+
+  Client
+  -------
+
+  Can handle multiple resultsets for COM_QUERY.
+
+  Requires
+  --------
+
+  ::CLIENT_PROTOCOL_41
+
+  @sa mysql_execute_command(), sp_head::MULTI_RESULTS
+*/
+#define CLIENT_MULTI_RESULTS (1UL << 17)
+/**
+  Multi-results and OUT parameters in PS-protocol.
+
+  Server
+  ------
+
+  Can send multiple resultsets for COM_STMT_EXECUTE.
+
+  Client
+  ------
+
+  Can handle multiple resultsets for COM_STMT_EXECUTE.
+
+  Requires
+  --------
+
+  ::CLIENT_PROTOCOL_41
+
+  @todo Reference COM_STMT_EXECUTE and PS-protocol
+
+  @sa Protocol_binary::send_out_parameters
+*/
+#define CLIENT_PS_MULTI_RESULTS (1UL << 18)
+
+/**
+  Client supports plugin authentication
+
+  Server
+  ------
+
+  Sends extra data in Initial Handshake Packet and supports the pluggable
+  authentication protocol.
+
+  Client
+  ------
+
+  Supports authentication plugins.
+
+  Requires
+  --------
+
+  ::CLIENT_PROTOCOL_41
+
+  @todo Reference plugin authentication, Initial Handshake Packet,
+  Authentication plugins
+
+  @sa send_change_user_packet(), send_client_reply_packet(), run_plugin_auth(),
+  parse_com_change_user_packet(), parse_client_handshake_packet()
+*/
+#define CLIENT_PLUGIN_AUTH (1UL << 19)
+/**
+  Client supports connection attributes
+
+  Server
+  ------
+
+  Permits connection attributes in Protocol::HandshakeResponse41.
+
+  Client
+  ------
+
+  Sends connection attributes in Protocol::HandshakeResponse41.
+
+  @todo Reference Protocol::HandshakeResponse41
+
+  @sa send_client_connect_attrs(), read_client_connect_attrs()
+*/
+#define CLIENT_CONNECT_ATTRS (1UL << 20)
+
+/**
+  Enable authentication response packet to be larger than 255 bytes.
+
+  When the ability to change default plugin require that the initial password
+  field in the Protocol::HandshakeResponse41 paclet can be of arbitrary size.
+  However, the 4.1 client-server protocol limits the length of the
+  auth-data-field sent from client to server to 255 bytes.
+  The solution is to change the type of the field to a true length encoded
+  string and indicate the protocol change
+  with this client capability flag.
+
+  Server
+  ------
+
+  Understands length-encoded integer for auth response data in
+  Protocol::HandshakeResponse41.
+
+  Client
+  ------
+
+  Length of auth response data in Protocol::HandshakeResponse41
+  is a length-encoded integer.
+
+  @todo Reference Protocol::HandshakeResponse41
+
+  @note The flag was introduced in 5.6.6, but had the wrong value.
+
+  @sa send_client_reply_packet(), parse_client_handshake_packet(),
+  get_56_lenc_string(), get_41_lenc_string()
+*/
+#define CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA (1UL << 21)
+
+/**
+  Don't close the connection for a user account with expired password.
+
+  Server
+  ------
+
+  Announces support for expired password extension.
+
+  Client
+  ------
+
+  Can handle expired passwords.
+
+  @todo Reference expired password
+
+  @sa MYSQL_OPT_CAN_HANDLE_EXPIRED_PASSWORDS, disconnect_on_expired_password
+  ACL_USER::password_expired, check_password_lifetime(), acl_authenticate()
+*/
+#define CLIENT_CAN_HANDLE_EXPIRED_PASSWORDS (1UL << 22)
+
+/**
+  Capable of handling server state change information. Its a hint to the
+  server to include the state change information in
+  @ref page_protocol_basic_ok_packet.
+
+  Server
+  ------
+  Can set ::SERVER_SESSION_STATE_CHANGED in the ::SERVER_STATUS_flags_enum
+  and send @ref sect_protocol_basic_ok_packet_sessinfo in a
+  @ref page_protocol_basic_ok_packet.
+
+  Client
+  ------
+
+  Expects the server to send @ref sect_protocol_basic_ok_packet_sessinfo in
+  a @ref page_protocol_basic_ok_packet.
+
+  @sa enum_session_state_type, read_ok_ex(), net_send_ok(), Session_tracker,
+  State_tracker
+*/
+#define CLIENT_SESSION_TRACK (1UL << 23)
+/**
+  Client no longer needs @ref page_protocol_basic_eof_packet and will
+  use @ref page_protocol_basic_ok_packet instead.
+  @sa net_send_ok()
+
+  Server
+  ------
+
+  Can send OK after a Text Resultset.
+
+  Client
+  ------
+
+  Expects an @ref page_protocol_basic_ok_packet (instead of
+  @ref page_protocol_basic_eof_packet) after the resultset rows of a
+  Text Resultset.
+
+  Background
+  ----------
+
+  To support ::CLIENT_SESSION_TRACK, additional information must be sent after
+  all successful commands. Although the @ref page_protocol_basic_ok_packet is
+  extensible, the @ref page_protocol_basic_eof_packet is not due to the overlap
+  of its bytes with the content of the Text Resultset Row.
+
+  Therefore, the @ref page_protocol_basic_eof_packet in the
+  Text Resultset is replaced with an @ref page_protocol_basic_ok_packet.
+  @ref page_protocol_basic_eof_packet is deprecated as of MySQL 5.7.5.
+
+  @todo Reference Text Resultset
+
+  @sa cli_safe_read_with_ok(), read_ok_ex(), net_send_ok(), net_send_eof()
+*/
+#define CLIENT_DEPRECATE_EOF (1UL << 24)
+
+/**
+  Verify server certificate.
+
+  Client only flag.
+
+  @deprecated in favor of --ssl-mode.
+*/
+#define CLIENT_SSL_VERIFY_SERVER_CERT (1UL << 30)
+
+/**
+  The client can handle optional metadata information in the resultset.
+*/
+#define CLIENT_OPTIONAL_RESULTSET_METADATA (1UL << 25)
+
+/**
+  Don't reset the options after an unsuccessful connect
+
+  Client only flag.
+
+  Typically passed via ::mysql_real_connect() 's client_flag parameter.
+
+  @sa mysql_real_connect()
+*/
+#define CLIENT_REMEMBER_OPTIONS (1UL << 31)
+/** @}*/
+
+/** a compatibility alias for CLIENT_COMPRESS */
+#define CAN_CLIENT_COMPRESS CLIENT_COMPRESS
+
+/** Gather all possible capabilites (flags) supported by the server */
+#define CLIENT_ALL_FLAGS                                                       \
+  (CLIENT_LONG_PASSWORD | CLIENT_FOUND_ROWS | CLIENT_LONG_FLAG |               \
+   CLIENT_CONNECT_WITH_DB | CLIENT_NO_SCHEMA | CLIENT_COMPRESS | CLIENT_ODBC | \
+   CLIENT_LOCAL_FILES | CLIENT_IGNORE_SPACE | CLIENT_PROTOCOL_41 |             \
+   CLIENT_INTERACTIVE | CLIENT_SSL | CLIENT_IGNORE_SIGPIPE |                   \
+   CLIENT_TRANSACTIONS | CLIENT_RESERVED | CLIENT_RESERVED2 |                  \
+   CLIENT_MULTI_STATEMENTS | CLIENT_MULTI_RESULTS | CLIENT_PS_MULTI_RESULTS |  \
+   CLIENT_SSL_VERIFY_SERVER_CERT | CLIENT_REMEMBER_OPTIONS |                   \
+   CLIENT_PLUGIN_AUTH | CLIENT_CONNECT_ATTRS |                                 \
+   CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA |                                     \
+   CLIENT_CAN_HANDLE_EXPIRED_PASSWORDS | CLIENT_SESSION_TRACK |                \
+   CLIENT_DEPRECATE_EOF | CLIENT_OPTIONAL_RESULTSET_METADATA)
+
+/**
+  Switch off from ::CLIENT_ALL_FLAGS the flags that are optional and
+  depending on build flags.
+  If any of the optional flags is supported by the build it will be switched
+  on before sending to the client during the connection handshake.
+*/
+#define CLIENT_BASIC_FLAGS                                 \
+  (((CLIENT_ALL_FLAGS & ~CLIENT_SSL) & ~CLIENT_COMPRESS) & \
+   ~CLIENT_SSL_VERIFY_SERVER_CERT)
+
+/** The status flags are a bit-field */
+enum SERVER_STATUS_flags_enum {
+  /**
+    Is raised when a multi-statement transaction
+    has been started, either explicitly, by means
+    of BEGIN or COMMIT AND CHAIN, or
+    implicitly, by the first transactional
+    statement, when autocommit=off.
+  */
+  SERVER_STATUS_IN_TRANS = 1,
+  SERVER_STATUS_AUTOCOMMIT = 2,   /**< Server in auto_commit mode */
+  SERVER_MORE_RESULTS_EXISTS = 8, /**< Multi query - next query exists */
+  SERVER_QUERY_NO_GOOD_INDEX_USED = 16,
+  SERVER_QUERY_NO_INDEX_USED = 32,
+  /**
+    The server was able to fulfill the clients request and opened a
+    read-only non-scrollable cursor for a query. This flag comes
+    in reply to COM_STMT_EXECUTE and COM_STMT_FETCH commands.
+    Used by Binary Protocol Resultset to signal that COM_STMT_FETCH
+    must be used to fetch the row-data.
+    @todo Refify "Binary Protocol Resultset" and "COM_STMT_FETCH".
+  */
+  SERVER_STATUS_CURSOR_EXISTS = 64,
+  /**
+    This flag is sent when a read-only cursor is exhausted, in reply to
+    COM_STMT_FETCH command.
+  */
+  SERVER_STATUS_LAST_ROW_SENT = 128,
+  SERVER_STATUS_DB_DROPPED = 256, /**< A database was dropped */
+  SERVER_STATUS_NO_BACKSLASH_ESCAPES = 512,
+  /**
+    Sent to the client if after a prepared statement reprepare
+    we discovered that the new statement returns a different
+    number of result set columns.
+  */
+  SERVER_STATUS_METADATA_CHANGED = 1024,
+  SERVER_QUERY_WAS_SLOW = 2048,
+  /**
+    To mark ResultSet containing output parameter values.
+  */
+  SERVER_PS_OUT_PARAMS = 4096,
+
+  /**
+    Set at the same time as SERVER_STATUS_IN_TRANS if the started
+    multi-statement transaction is a read-only transaction. Cleared
+    when the transaction commits or aborts. Since this flag is sent
+    to clients in OK and EOF packets, the flag indicates the
+    transaction status at the end of command execution.
+  */
+  SERVER_STATUS_IN_TRANS_READONLY = 8192,
+
+  /**
+    This status flag, when on, implies that one of the state information has
+    changed on the server because of the execution of the last statement.
+  */
+  SERVER_SESSION_STATE_CHANGED = (1UL << 14)
+};
+
+/**
+  Server status flags that must be cleared when starting
+  execution of a new SQL statement.
+  Flags from this set are only added to the
+  current server status by the execution engine, but
+  never removed -- the execution engine expects them
+  to disappear automagically by the next command.
+*/
+#define SERVER_STATUS_CLEAR_SET                                   \
+  (SERVER_QUERY_NO_GOOD_INDEX_USED | SERVER_QUERY_NO_INDEX_USED | \
+   SERVER_MORE_RESULTS_EXISTS | SERVER_STATUS_METADATA_CHANGED |  \
+   SERVER_QUERY_WAS_SLOW | SERVER_STATUS_DB_DROPPED |             \
+   SERVER_STATUS_CURSOR_EXISTS | SERVER_STATUS_LAST_ROW_SENT |    \
+   SERVER_SESSION_STATE_CHANGED)
+
+/** Max length of a error message. Should be kept in sync with ::ERRMSGSIZE. */
+#define MYSQL_ERRMSG_SIZE 512
+#define NET_READ_TIMEOUT 30          /**< Timeout on read */
+#define NET_WRITE_TIMEOUT 60         /**< Timeout on write */
+#define NET_WAIT_TIMEOUT 8 * 60 * 60 /**< Wait for new query */
+
+/**
+  Flag used by the parser. Kill only the query and not the connection.
+
+  @sa SQLCOM_KILL, sql_kill(), LEX::type
+*/
+#define ONLY_KILL_QUERY 1
+
+#ifndef MYSQL_VIO
+struct Vio;
+#define MYSQL_VIO struct Vio *
+#endif
+
+#define MAX_TINYINT_WIDTH 3     /**< Max width for a TINY w.o. sign */
+#define MAX_SMALLINT_WIDTH 5    /**< Max width for a SHORT w.o. sign */
+#define MAX_MEDIUMINT_WIDTH 8   /**< Max width for a INT24 w.o. sign */
+#define MAX_INT_WIDTH 10        /**< Max width for a LONG w.o. sign */
+#define MAX_BIGINT_WIDTH 20     /**< Max width for a LONGLONG */
+#define MAX_CHAR_WIDTH 255      /**< Max length for a CHAR colum */
+#define MAX_BLOB_WIDTH 16777216 /**< Default width for blob */
+
+typedef struct NET {
+  MYSQL_VIO vio;
+  unsigned char *buff, *buff_end, *write_pos, *read_pos;
+  my_socket fd; /* For Perl DBI/dbd */
+  /**
+    Set if we are doing several queries in one
+    command ( as in LOAD TABLE ... FROM MASTER ),
+    and do not want to confuse the client with OK at the wrong time
+  */
+  unsigned long remain_in_buf, length, buf_length, where_b;
+  unsigned long max_packet, max_packet_size;
+  unsigned int pkt_nr, compress_pkt_nr;
+  unsigned int write_timeout, read_timeout, retry_count;
+  int fcntl;
+  unsigned int *return_status;
+  unsigned char reading_or_writing;
+  unsigned char save_char;
+  bool compress;
+  unsigned int last_errno;
+  unsigned char error;
+  /** Client library error message buffer. Actually belongs to struct MYSQL. */
+  char last_error[MYSQL_ERRMSG_SIZE];
+  /** Client library sqlstate buffer. Set along with the error message. */
+  char sqlstate[SQLSTATE_LENGTH + 1];
+  /**
+    Extension pointer, for the caller private use.
+    Any program linking with the networking library can use this pointer,
+    which is handy when private connection specific data needs to be
+    maintained.
+    The mysqld server process uses this pointer internally,
+    to maintain the server internal instrumentation for the connection.
+  */
+  void *extension;
+} NET;
+
+#define packet_error (~(unsigned long)0)
+
+/**
+  @addtogroup group_cs_backward_compatibility Backward compatibility
+  @ingroup group_cs
+  @{
+*/
+#define CLIENT_MULTI_QUERIES CLIENT_MULTI_STATEMENTS
+#define FIELD_TYPE_DECIMAL MYSQL_TYPE_DECIMAL
+#define FIELD_TYPE_NEWDECIMAL MYSQL_TYPE_NEWDECIMAL
+#define FIELD_TYPE_TINY MYSQL_TYPE_TINY
+#define FIELD_TYPE_SHORT MYSQL_TYPE_SHORT
+#define FIELD_TYPE_LONG MYSQL_TYPE_LONG
+#define FIELD_TYPE_FLOAT MYSQL_TYPE_FLOAT
+#define FIELD_TYPE_DOUBLE MYSQL_TYPE_DOUBLE
+#define FIELD_TYPE_NULL MYSQL_TYPE_NULL
+#define FIELD_TYPE_TIMESTAMP MYSQL_TYPE_TIMESTAMP
+#define FIELD_TYPE_LONGLONG MYSQL_TYPE_LONGLONG
+#define FIELD_TYPE_INT24 MYSQL_TYPE_INT24
+#define FIELD_TYPE_DATE MYSQL_TYPE_DATE
+#define FIELD_TYPE_TIME MYSQL_TYPE_TIME
+#define FIELD_TYPE_DATETIME MYSQL_TYPE_DATETIME
+#define FIELD_TYPE_YEAR MYSQL_TYPE_YEAR
+#define FIELD_TYPE_NEWDATE MYSQL_TYPE_NEWDATE
+#define FIELD_TYPE_ENUM MYSQL_TYPE_ENUM
+#define FIELD_TYPE_SET MYSQL_TYPE_SET
+#define FIELD_TYPE_TINY_BLOB MYSQL_TYPE_TINY_BLOB
+#define FIELD_TYPE_MEDIUM_BLOB MYSQL_TYPE_MEDIUM_BLOB
+#define FIELD_TYPE_LONG_BLOB MYSQL_TYPE_LONG_BLOB
+#define FIELD_TYPE_BLOB MYSQL_TYPE_BLOB
+#define FIELD_TYPE_VAR_STRING MYSQL_TYPE_VAR_STRING
+#define FIELD_TYPE_STRING MYSQL_TYPE_STRING
+#define FIELD_TYPE_CHAR MYSQL_TYPE_TINY
+#define FIELD_TYPE_INTERVAL MYSQL_TYPE_ENUM
+#define FIELD_TYPE_GEOMETRY MYSQL_TYPE_GEOMETRY
+#define FIELD_TYPE_BIT MYSQL_TYPE_BIT
+/** @}*/
+
+/**
+  @addtogroup group_cs_shutdown_kill_constants Shutdown/kill enums and constants
+  @ingroup group_cs
+
+  @sa THD::is_killable
+  @{
+*/
+#define MYSQL_SHUTDOWN_KILLABLE_CONNECT (unsigned char)(1 << 0)
+#define MYSQL_SHUTDOWN_KILLABLE_TRANS (unsigned char)(1 << 1)
+#define MYSQL_SHUTDOWN_KILLABLE_LOCK_TABLE (unsigned char)(1 << 2)
+#define MYSQL_SHUTDOWN_KILLABLE_UPDATE (unsigned char)(1 << 3)
+
+/**
+  We want levels to be in growing order of hardness (because we use number
+  comparisons).
+
+  @note ::SHUTDOWN_DEFAULT does not respect the growing property, but it's ok.
+*/
+enum mysql_enum_shutdown_level {
+  SHUTDOWN_DEFAULT = 0,
+  /** Wait for existing connections to finish */
+  SHUTDOWN_WAIT_CONNECTIONS = MYSQL_SHUTDOWN_KILLABLE_CONNECT,
+  /** Wait for existing transactons to finish */
+  SHUTDOWN_WAIT_TRANSACTIONS = MYSQL_SHUTDOWN_KILLABLE_TRANS,
+  /** Wait for existing updates to finish (=> no partial MyISAM update) */
+  SHUTDOWN_WAIT_UPDATES = MYSQL_SHUTDOWN_KILLABLE_UPDATE,
+  /** Flush InnoDB buffers and other storage engines' buffers*/
+  SHUTDOWN_WAIT_ALL_BUFFERS = (MYSQL_SHUTDOWN_KILLABLE_UPDATE << 1),
+  /** Don't flush InnoDB buffers, flush other storage engines' buffers*/
+  SHUTDOWN_WAIT_CRITICAL_BUFFERS = (MYSQL_SHUTDOWN_KILLABLE_UPDATE << 1) + 1,
+  /** Query level of the KILL command */
+  KILL_QUERY = 254,
+  /** Connection level of the KILL command */
+  KILL_CONNECTION = 255
+};
+/** @}*/
+
+enum enum_resultset_metadata {
+  /** No metadata will be sent. */
+  RESULTSET_METADATA_NONE = 0,
+  /** The server will send all metadata. */
+  RESULTSET_METADATA_FULL = 1
+};
+
+enum enum_cursor_type {
+  CURSOR_TYPE_NO_CURSOR = 0,
+  CURSOR_TYPE_READ_ONLY = 1,
+  CURSOR_TYPE_FOR_UPDATE = 2,
+  CURSOR_TYPE_SCROLLABLE = 4
+};
+
+/** options for ::mysql_options() */
+enum enum_mysql_set_option {
+  MYSQL_OPTION_MULTI_STATEMENTS_ON,
+  MYSQL_OPTION_MULTI_STATEMENTS_OFF
+};
+
+/**
+  Type of state change information that the server can include in the Ok
+  packet.
+
+  @note
+    - session_state_type shouldn't go past 255 (i.e. 1-byte boundary).
+    - Modify the definition of ::SESSION_TRACK_END when a new member is added.
+*/
+enum enum_session_state_type {
+  SESSION_TRACK_SYSTEM_VARIABLES, /**< Session system variables */
+  SESSION_TRACK_SCHEMA,           /**< Current schema */
+  SESSION_TRACK_STATE_CHANGE,     /**< track session state changes */
+  SESSION_TRACK_GTIDS,            /**< See also: session_track_gtids */
+  SESSION_TRACK_TRANSACTION_CHARACTERISTICS, /**< Transaction chistics */
+  SESSION_TRACK_TRANSACTION_STATE            /**< Transaction state */
+};
+
+/** start of ::enum_session_state_type */
+#define SESSION_TRACK_BEGIN SESSION_TRACK_SYSTEM_VARIABLES
+
+/** End of ::enum_session_state_type */
+#define SESSION_TRACK_END SESSION_TRACK_TRANSACTION_STATE
+
+/** is T a valid session state type */
+#define IS_SESSION_STATE_TYPE(T) \
+  (((int)(T) >= SESSION_TRACK_BEGIN) && ((T) <= SESSION_TRACK_END))
+
+#define net_new_transaction(net) ((net)->pkt_nr = 0)
+
+bool my_net_init(struct NET *net, MYSQL_VIO vio);
+void my_net_local_init(struct NET *net);
+void net_end(struct NET *net);
+void net_clear(struct NET *net, bool check_buffer);
+void net_claim_memory_ownership(struct NET *net);
+bool net_realloc(struct NET *net, size_t length);
+bool net_flush(struct NET *net);
+bool my_net_write(struct NET *net, const unsigned char *packet, size_t len);
+bool net_write_command(struct NET *net, unsigned char command,
+                       const unsigned char *header, size_t head_len,
+                       const unsigned char *packet, size_t len);
+bool net_write_packet(struct NET *net, const unsigned char *packet,
+                      size_t length);
+unsigned long my_net_read(struct NET *net);
+void my_net_set_write_timeout(struct NET *net, unsigned int timeout);
+void my_net_set_read_timeout(struct NET *net, unsigned int timeout);
+void my_net_set_retry_count(struct NET *net, unsigned int retry_count);
+
+struct rand_struct {
+  unsigned long seed1, seed2, max_value;
+  double max_value_dbl;
+};
+
+/* Include the types here so existing UDFs can keep compiling */
+#include <mysql/udf_registration_types.h>
+
+/**
+  @addtogroup group_cs_compresson_constants Constants when using compression
+  @ingroup group_cs
+  @{
+*/
+#define NET_HEADER_SIZE 4  /**< standard header size */
+#define COMP_HEADER_SIZE 3 /**< compression header extra size */
+/** @}*/
+
+/* Prototypes to password functions */
+
+/*
+  These functions are used for authentication by client and server and
+  implemented in sql/password.c
+*/
+
+void randominit(struct rand_struct *, unsigned long seed1, unsigned long seed2);
+double my_rnd(struct rand_struct *);
+void create_random_string(char *to, unsigned int length,
+                          struct rand_struct *rand_st);
+
+void hash_password(unsigned long *to, const char *password,
+                   unsigned int password_len);
+void make_scrambled_password_323(char *to, const char *password);
+void scramble_323(char *to, const char *message, const char *password);
+bool check_scramble_323(const unsigned char *reply, const char *message,
+                        unsigned long *salt);
+void get_salt_from_password_323(unsigned long *res, const char *password);
+void make_password_from_salt_323(char *to, const unsigned long *salt);
+
+void make_scrambled_password(char *to, const char *password);
+void scramble(char *to, const char *message, const char *password);
+bool check_scramble(const unsigned char *reply, const char *message,
+                    const unsigned char *hash_stage2);
+void get_salt_from_password(unsigned char *res, const char *password);
+void make_password_from_salt(char *to, const unsigned char *hash_stage2);
+char *octet2hex(char *to, const char *str, unsigned int len);
+
+/* end of password.c */
+
+bool generate_sha256_scramble(unsigned char *dst, size_t dst_size,
+                              const char *src, size_t src_size, const char *rnd,
+                              size_t rnd_size);
+
+// extern "C" since it is an (undocumented) part of the libmysql ABI.
+#ifdef __cplusplus
+extern "C" {
+#endif
+char *get_tty_password(const char *opt_message);
+#ifdef __cplusplus
+}
+#endif
+
+const char *mysql_errno_to_sqlstate(unsigned int mysql_errno);
+
+/* Some other useful functions */
+
+// Need to be extern "C" for the time being, due to memcached.
+#ifdef __cplusplus
+extern "C" {
+#endif
+bool my_thread_init(void);
+void my_thread_end(void);
+#ifdef __cplusplus
+}
+#endif
+
+#ifdef STDCALL
+unsigned long STDCALL net_field_length(unsigned char **packet);
+unsigned long STDCALL net_field_length_checked(unsigned char **packet,
+                                               unsigned long max_length);
+#endif
+unsigned long long net_field_length_ll(unsigned char **packet);
+unsigned char *net_store_length(unsigned char *pkg, unsigned long long length);
+unsigned int net_length_size(unsigned long long num);
+unsigned int net_field_length_size(const unsigned char *pos);
+
+#define NULL_LENGTH ((unsigned long)~0) /**< For ::net_store_length() */
+#define MYSQL_STMT_HEADER 4
+#define MYSQL_LONG_DATA_HEADER 6
+
+#define NOT_FIXED_DEC 31
+#endif