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Workaround for bug in thread library in Unixware 7

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Fixed bug in GROUP BY on ELT()
Added SEQUENCE() to UDF examples
This commit is contained in:
monty@donna.mysql.com
2001-02-03 18:00:29 +02:00
parent cffc2849f9
commit 728b63e0de
12 changed files with 268 additions and 73 deletions
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55
sql/udf_example.cc
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@@ -56,11 +56,13 @@
**
** Function 'myfunc_int' returns summary length of all its arguments.
**
** Function 'sequence' returns an sequence starting from a certain number
**
** On the end is a couple of functions that converts hostnames to ip and
** vice versa.
**
** A dynamicly loadable file should be compiled sharable
** (something like: gcc -shared -o udf_example.so myfunc.cc).
** (something like: gcc -shared -o my_func.so myfunc.cc).
** You can easily get all switches right by doing:
** cd sql ; make udf_example.o
** Take the compile line that make writes, remove the '-c' near the end of
@@ -74,6 +76,7 @@
** CREATE FUNCTION metaphon RETURNS STRING SONAME "udf_example.so";
** CREATE FUNCTION myfunc_double RETURNS REAL SONAME "udf_example.so";
** CREATE FUNCTION myfunc_int RETURNS INTEGER SONAME "udf_example.so";
** CREATE FUNCTION sequence RETURNS INTEGER SONAME "udf_example.so";
** CREATE FUNCTION lookup RETURNS STRING SONAME "udf_example.so";
** CREATE FUNCTION reverse_lookup RETURNS STRING SONAME "udf_example.so";
** CREATE AGGREGATE FUNCTION avgcost RETURNS REAL SONAME "udf_example.so";
@@ -121,6 +124,10 @@ double myfunc_double(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
char *error);
longlong myfunc_int(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
char *error);
my_bool sequence_init(UDF_INIT *initid, UDF_ARGS *args, char *message);
void sequence_deinit(UDF_INIT *initid);
long long sequence(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
char *error);
}
@@ -535,6 +542,8 @@ double myfunc_double(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
** This function should return the result as a long long
***************************************************************************/
/* This function returns the sum of all arguments */
long long myfunc_int(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
char *error)
{
@@ -559,6 +568,50 @@ long long myfunc_int(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
}
/*
Simple example of how to get a sequences starting from the first argument
or 1 if no arguments have been given
*/
my_bool sequence_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
if (args->arg_count > 1)
{
strmov(message,"This function takes none or 1 argument");
return 1;
}
if (args->arg_count)
args->arg_type[0]= INT_RESULT; // Force argument to int
if (!(initid->ptr=(char*) malloc(sizeof(longlong))))
{
strmov(message,"Couldn't allocate memory");
return 1;
}
bzero(initid->ptr,sizeof(longlong));
// Fool MySQL to think that this function is a constant
// This will ensure that MySQL only evalutes the function
// when the rows are sent to the client and not before any ORDER BY
// clauses
initid->const_item=1;
return 0;
}
void sequence_deinit(UDF_INIT *initid)
{
if (initid->ptr)
free(initid->ptr);
}
long long sequence(UDF_INIT *initid, UDF_ARGS *args, char *is_null,
char *error)
{
ulonglong val=0;
if (args->arg_count)
val= *((long long*) args->args[0]);
return ++ *((longlong*) initid->ptr) + val;
}
/****************************************************************************
** Some functions that handles IP and hostname conversions
** The orignal function was from Zeev Suraski.