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✏️ Editing: udf_registration_types.h

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it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.

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which is part of C Driver for MySQL (Connector/C), is also subject to the
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#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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