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MDEV-15073: Generic UDAF parser code in server for windows functions

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Added support for usual agreggate UDF (UDAF)
Added remove() call support for more efficient window function processing
Added example of aggregate UDF with efficient windows function support
This commit is contained in:
Oleksandr Byelkin
2018-11-20 10:58:34 +01:00
parent a956260d82
commit 555921a9c3
10 changed files with 386 additions and 0 deletions
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3
sql/sql_udf.cc
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@ -76,6 +76,8 @@ static const char *init_syms(udf_func *tmp, char *nm)
(void)strmov(end, "_add");
if (!((tmp->func_add= (Udf_func_add) dlsym(tmp->dlhandle, nm))))
return nm;
(void)strmov(end, "_remove");
tmp->func_remove= (Udf_func_add) dlsym(tmp->dlhandle, nm);
}
(void) strmov(end,"_deinit");
@ -565,6 +567,7 @@ int mysql_create_function(THD *thd,udf_func *udf)
u_d->func_deinit= udf->func_deinit;
u_d->func_clear= udf->func_clear;
u_d->func_add= udf->func_add;
u_d->func_remove= udf->func_remove;
/* create entry in mysql.func table */