greenplumn dict_int 源码
greenplumn dict_int 代码
文件路径：/contrib/dict_int/dict_int.c
/*-------------------------------------------------------------------------
*
* dict_int.c
* Text search dictionary for integers
*
* Copyright (c) 2007-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* contrib/dict_int/dict_int.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "commands/defrem.h"
#include "tsearch/ts_public.h"
PG_MODULE_MAGIC;
typedef struct
{
int maxlen;
bool rejectlong;
} DictInt;
PG_FUNCTION_INFO_V1(dintdict_init);
PG_FUNCTION_INFO_V1(dintdict_lexize);
Datum
dintdict_init(PG_FUNCTION_ARGS)
{
List *dictoptions = (List *) PG_GETARG_POINTER(0);
DictInt *d;
ListCell *l;
d = (DictInt *) palloc0(sizeof(DictInt));
d->maxlen = 6;
d->rejectlong = false;
foreach(l, dictoptions)
{
DefElem *defel = (DefElem *) lfirst(l);
if (strcmp(defel->defname, "maxlen") == 0)
{
d->maxlen = atoi(defGetString(defel));
}
else if (strcmp(defel->defname, "rejectlong") == 0)
{
d->rejectlong = defGetBoolean(defel);
}
else
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unrecognized intdict parameter: \"%s\"",
defel->defname)));
}
}
PG_RETURN_POINTER(d);
}
Datum
dintdict_lexize(PG_FUNCTION_ARGS)
{
DictInt *d = (DictInt *) PG_GETARG_POINTER(0);
char *in = (char *) PG_GETARG_POINTER(1);
char *txt = pnstrdup(in, PG_GETARG_INT32(2));
TSLexeme *res = palloc0(sizeof(TSLexeme) * 2);
res[1].lexeme = NULL;
if (PG_GETARG_INT32(2) > d->maxlen)
{
if (d->rejectlong)
{
/* reject by returning void array */
pfree(txt);
res[0].lexeme = NULL;
}
else
{
/* trim integer */
txt[d->maxlen] = '\0';
res[0].lexeme = txt;
}
}
else
{
res[0].lexeme = txt;
}
PG_RETURN_POINTER(res);
}
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