QueryItem *
clean_NOT(QueryItem *ptr, int *len)
{
NODE *root = maketree(ptr);
return plaintree(clean_NOT_intree(root), len);
}
ITEM *
clean_NOT(ITEM * ptr, int4 *len)
{
NODE *root = maketree(ptr);
return plaintree(clean_NOT_intree(root), len);
}
/*
* Remove QI_VALSTOP (stopword) nodes from TSQuery.
*/
TSQuery
cleanup_tsquery_stopwords(TSQuery in)
{
int32 len,
lenstr,
commonlen,
i;
NODE *root;
int ladd,
radd;
TSQuery out;
QueryItem *items;
char *operands;
if (in->size == 0)
return in;
/* eliminate stop words */
root = clean_stopword_intree(maketree(GETQUERY(in)), &ladd, &radd);
if (root == NULL)
{
ereport(NOTICE,
(errmsg("text-search query contains only stop words or doesn't contain lexemes, ignored")));
out = palloc(HDRSIZETQ);
out->size = 0;
SET_VARSIZE(out, HDRSIZETQ);
return out;
}
/*
* Build TSQuery from plain view
*/
lenstr = calcstrlen(root);
items = plaintree(root, &len);
commonlen = COMPUTESIZE(len, lenstr);
out = palloc(commonlen);
SET_VARSIZE(out, commonlen);
out->size = len;
memcpy(GETQUERY(out), items, len * sizeof(QueryItem));
items = GETQUERY(out);
operands = GETOPERAND(out);
for (i = 0; i < out->size; i++)
{
QueryOperand *op = (QueryOperand *) &items[i];
if (op->type != QI_VAL)
continue;
memcpy(operands, GETOPERAND(in) + op->distance, op->length);
operands[op->length] = '\0';
op->distance = operands - GETOPERAND(out);
operands += op->length + 1;
}
return out;
}
ITEM *
clean_fakeval(ITEM * ptr, int4 *len)
{
NODE *root = maketree(ptr);
char result = V_UNKNOWN;
NODE *resroot;
resroot = clean_fakeval_intree(root, &result);
if (result != V_UNKNOWN)
{
elog(NOTICE, "query contains only stopword(s) or doesn't contain lexeme(s), ignored");
*len = 0;
return NULL;
}
return plaintree(resroot, len);
}
QueryItem *
clean_fakeval(QueryItem *ptr, int *len)
{
NODE *root = maketree(ptr);
char result = V_UNKNOWN;
NODE *resroot;
resroot = clean_fakeval_intree(root, &result);
if (result != V_UNKNOWN)
{
ereport(NOTICE,
(errmsg("text-search query contains only stop words or doesn't contain lexemes, ignored")));
*len = 0;
return NULL;
}
return plaintree(resroot, len);
}
