greenplumn dict 源码
greenplumn dict 代码
文件路径：/src/backend/tsearch/dict.c
/*-------------------------------------------------------------------------
*
* dict.c
* Standard interface to dictionary
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* src/backend/tsearch/dict.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "catalog/pg_type.h"
#include "tsearch/ts_cache.h"
#include "tsearch/ts_utils.h"
#include "utils/builtins.h"
/*
* Lexize one word by dictionary, mostly debug function
*/
Datum
ts_lexize(PG_FUNCTION_ARGS)
{
Oid dictId = PG_GETARG_OID(0);
text *in = PG_GETARG_TEXT_PP(1);
ArrayType *a;
TSDictionaryCacheEntry *dict;
TSLexeme *res,
*ptr;
Datum *da;
DictSubState dstate = {false, false, NULL};
dict = lookup_ts_dictionary_cache(dictId);
res = (TSLexeme *) DatumGetPointer(FunctionCall4(&dict->lexize,
PointerGetDatum(dict->dictData),
PointerGetDatum(VARDATA_ANY(in)),
Int32GetDatum(VARSIZE_ANY_EXHDR(in)),
PointerGetDatum(&dstate)));
if (dstate.getnext)
{
dstate.isend = true;
ptr = (TSLexeme *) DatumGetPointer(FunctionCall4(&dict->lexize,
PointerGetDatum(dict->dictData),
PointerGetDatum(VARDATA_ANY(in)),
Int32GetDatum(VARSIZE_ANY_EXHDR(in)),
PointerGetDatum(&dstate)));
if (ptr != NULL)
res = ptr;
}
if (!res)
PG_RETURN_NULL();
ptr = res;
while (ptr->lexeme)
ptr++;
da = (Datum *) palloc(sizeof(Datum) * (ptr - res));
ptr = res;
while (ptr->lexeme)
{
da[ptr - res] = CStringGetTextDatum(ptr->lexeme);
ptr++;
}
a = construct_array(da,
ptr - res,
TEXTOID,
-1,
false,
'i');
ptr = res;
while (ptr->lexeme)
{
pfree(DatumGetPointer(da[ptr - res]));
pfree(ptr->lexeme);
ptr++;
}
pfree(res);
pfree(da);
PG_RETURN_POINTER(a);
}
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