晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/mysql/mysql/udf_registration_types.h
/* Copyright (c) 2017, 2023, Oracle and/or its affiliates.

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 */

#ifndef UDF_REGISTRATION_TYPES_H
#define UDF_REGISTRATION_TYPES_H

#ifndef MYSQL_ABI_CHECK
#include <stdbool.h>
#endif

/**
Type of the user defined function return slot and arguments
*/
enum Item_result {
  INVALID_RESULT = -1, /** not valid for UDFs */
  STRING_RESULT = 0,   /** char * */
  REAL_RESULT,         /** double */
  INT_RESULT,          /** long long */
  ROW_RESULT,          /** not valid for UDFs */
  DECIMAL_RESULT       /** char *, to be converted to/from a decimal */
};

typedef struct UDF_ARGS {
  unsigned int arg_count;           /**< Number of arguments */
  enum Item_result *arg_type;       /**< Pointer to item_results */
  char **args;                      /**< Pointer to argument */
  unsigned long *lengths;           /**< Length of string arguments */
  char *maybe_null;                 /**< Set to 1 for all maybe_null args */
  char **attributes;                /**< Pointer to attribute name */
  unsigned long *attribute_lengths; /**< Length of attribute arguments */
  void *extension;
} UDF_ARGS;

/**
Information about the result of a user defined function

@todo add a notion for determinism of the UDF.

@sa Item_udf_func::update_used_tables()
*/
typedef struct UDF_INIT {
  bool maybe_null;          /** 1 if function can return NULL */
  unsigned int decimals;    /** for real functions */
  unsigned long max_length; /** For string functions */
  char *ptr;                /** free pointer for function data */
  bool const_item;          /** 1 if function always returns the same value */
  void *extension;
} UDF_INIT;

enum Item_udftype { UDFTYPE_FUNCTION = 1, UDFTYPE_AGGREGATE };

typedef void (*Udf_func_clear)(UDF_INIT *, unsigned char *, unsigned char *);
typedef void (*Udf_func_add)(UDF_INIT *, UDF_ARGS *, unsigned char *,
                             unsigned char *);
typedef void (*Udf_func_deinit)(UDF_INIT *);
typedef bool (*Udf_func_init)(UDF_INIT *, UDF_ARGS *, char *);
typedef void (*Udf_func_any)(void);
typedef double (*Udf_func_double)(UDF_INIT *, UDF_ARGS *, unsigned char *,
                                  unsigned char *);
typedef long long (*Udf_func_longlong)(UDF_INIT *, UDF_ARGS *, unsigned char *,
                                       unsigned char *);
typedef char *(*Udf_func_string)(UDF_INIT *, UDF_ARGS *, char *,
                                 unsigned long *, unsigned char *,
                                 unsigned char *);

#endif /* UDF_REGISTRATION_TYPES_H */

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