mirror of https://github.com/postgres/postgres
712 lines
13 KiB
C
712 lines
13 KiB
C
/*
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* Relevation
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* Teodor Sigaev <teodor@sigaev.ru>
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*/
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#include "postgres.h"
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#include <math.h>
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#include "access/gist.h"
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#include "access/itup.h"
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#include "utils/builtins.h"
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#include "fmgr.h"
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#include "funcapi.h"
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#include "storage/bufpage.h"
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#include "executor/spi.h"
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#include "commands/trigger.h"
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#include "nodes/pg_list.h"
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#include "catalog/namespace.h"
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#include "utils/array.h"
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#include "tsvector.h"
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#include "query.h"
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#include "common.h"
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PG_FUNCTION_INFO_V1(rank);
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Datum rank(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(rank_def);
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Datum rank_def(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(rank_cd);
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Datum rank_cd(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(rank_cd_def);
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Datum rank_cd_def(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(get_covers);
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Datum get_covers(PG_FUNCTION_ARGS);
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static float weights[] = {0.1, 0.2, 0.4, 1.0};
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#define wpos(wep) ( w[ ((WordEntryPos*)(wep))->weight ] )
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#define DEF_NORM_METHOD 0
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/*
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* Returns a weight of a word collocation
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*/
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static float4
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word_distance(int4 w)
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{
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if (w > 100)
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return 1e-30;
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return 1.0 / (1.005 + 0.05 * exp(((float4) w) / 1.5 - 2));
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}
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static int
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cnt_length(tsvector * t)
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{
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WordEntry *ptr = ARRPTR(t),
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*end = (WordEntry *) STRPTR(t);
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int len = 0,
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clen;
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while (ptr < end)
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{
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if ((clen = POSDATALEN(t, ptr)) == 0)
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len += 1;
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else
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len += clen;
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ptr++;
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}
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return len;
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}
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static int4
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WordECompareITEM(char *eval, char *qval, WordEntry * ptr, ITEM * item)
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{
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if (ptr->len == item->length)
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return strncmp(
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eval + ptr->pos,
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qval + item->distance,
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item->length);
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return (ptr->len > item->length) ? 1 : -1;
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}
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static WordEntry *
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find_wordentry(tsvector * t, QUERYTYPE * q, ITEM * item)
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{
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WordEntry *StopLow = ARRPTR(t);
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WordEntry *StopHigh = (WordEntry *) STRPTR(t);
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WordEntry *StopMiddle;
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int difference;
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/* Loop invariant: StopLow <= item < StopHigh */
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while (StopLow < StopHigh)
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{
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StopMiddle = StopLow + (StopHigh - StopLow) / 2;
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difference = WordECompareITEM(STRPTR(t), GETOPERAND(q), StopMiddle, item);
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if (difference == 0)
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return StopMiddle;
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else if (difference < 0)
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StopLow = StopMiddle + 1;
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else
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StopHigh = StopMiddle;
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}
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return NULL;
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}
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static WordEntryPos POSNULL[] = {
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{0, 0},
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{0, MAXENTRYPOS - 1}
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};
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static float
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calc_rank_and(float *w, tsvector * t, QUERYTYPE * q)
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{
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uint16 **pos = (uint16 **) palloc(sizeof(uint16 *) * q->size);
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int i,
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k,
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l,
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p;
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WordEntry *entry;
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WordEntryPos *post,
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*ct;
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int4 dimt,
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lenct,
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dist;
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float res = -1.0;
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ITEM *item = GETQUERY(q);
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memset(pos, 0, sizeof(uint16 **) * q->size);
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*(uint16 *) POSNULL = lengthof(POSNULL) - 1;
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for (i = 0; i < q->size; i++)
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{
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if (item[i].type != VAL)
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continue;
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entry = find_wordentry(t, q, &(item[i]));
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if (!entry)
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continue;
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if (entry->haspos)
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pos[i] = (uint16 *) _POSDATAPTR(t, entry);
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else
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pos[i] = (uint16 *) POSNULL;
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dimt = *(uint16 *) (pos[i]);
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post = (WordEntryPos *) (pos[i] + 1);
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for (k = 0; k < i; k++)
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{
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if (!pos[k])
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continue;
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lenct = *(uint16 *) (pos[k]);
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ct = (WordEntryPos *) (pos[k] + 1);
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for (l = 0; l < dimt; l++)
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{
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for (p = 0; p < lenct; p++)
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{
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dist = abs(post[l].pos - ct[p].pos);
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if (dist || (dist == 0 && (pos[i] == (uint16 *) POSNULL || pos[k] == (uint16 *) POSNULL)))
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{
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float curw;
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if (!dist)
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dist = MAXENTRYPOS;
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curw = sqrt(wpos(&(post[l])) * wpos(&(ct[p])) * word_distance(dist));
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res = (res < 0) ? curw : 1.0 - (1.0 - res) * (1.0 - curw);
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}
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}
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}
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}
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}
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pfree(pos);
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return res;
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}
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static float
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calc_rank_or(float *w, tsvector * t, QUERYTYPE * q)
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{
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WordEntry *entry;
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WordEntryPos *post;
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int4 dimt,
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j,
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i;
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float res = -1.0;
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ITEM *item = GETQUERY(q);
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*(uint16 *) POSNULL = lengthof(POSNULL) - 1;
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for (i = 0; i < q->size; i++)
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{
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if (item[i].type != VAL)
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continue;
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entry = find_wordentry(t, q, &(item[i]));
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if (!entry)
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continue;
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if (entry->haspos)
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{
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dimt = POSDATALEN(t, entry);
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post = POSDATAPTR(t, entry);
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}
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else
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{
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dimt = *(uint16 *) POSNULL;
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post = POSNULL + 1;
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}
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for (j = 0; j < dimt; j++)
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{
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if (res < 0)
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res = wpos(&(post[j]));
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else
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res = 1.0 - (1.0 - res) * (1.0 - wpos(&(post[j])));
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}
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}
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return res;
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}
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static float
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calc_rank(float *w, tsvector * t, QUERYTYPE * q, int4 method)
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{
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ITEM *item = GETQUERY(q);
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float res = 0.0;
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if (!t->size || !q->size)
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return 0.0;
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res = (item->type != VAL && item->val == (int4) '&') ?
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calc_rank_and(w, t, q) : calc_rank_or(w, t, q);
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if (res < 0)
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res = 1e-20;
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switch (method)
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{
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case 0:
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break;
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case 1:
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res /= log((float) cnt_length(t));
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break;
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case 2:
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res /= (float) cnt_length(t);
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break;
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default:
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/* internal error */
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elog(ERROR, "unrecognized normalization method: %d", method);
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}
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return res;
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}
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Datum
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rank(PG_FUNCTION_ARGS)
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{
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ArrayType *win = (ArrayType *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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tsvector *txt = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_DATUM(2));
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int method = DEF_NORM_METHOD;
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float res = 0.0;
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float ws[lengthof(weights)];
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int i;
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if (ARR_NDIM(win) != 1)
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ereport(ERROR,
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(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
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errmsg("array of weight must be one-dimensional")));
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if (ARRNELEMS(win) < lengthof(weights))
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ereport(ERROR,
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(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
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errmsg("array of weight is too short")));
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for (i = 0; i < lengthof(weights); i++)
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{
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ws[i] = (((float4 *) ARR_DATA_PTR(win))[i] >= 0) ? ((float4 *) ARR_DATA_PTR(win))[i] : weights[i];
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if (ws[i] > 1.0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("weight out of range")));
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}
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if (PG_NARGS() == 4)
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method = PG_GETARG_INT32(3);
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res = calc_rank(ws, txt, query, method);
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PG_FREE_IF_COPY(win, 0);
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PG_FREE_IF_COPY(txt, 1);
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PG_FREE_IF_COPY(query, 2);
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PG_RETURN_FLOAT4(res);
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}
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Datum
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rank_def(PG_FUNCTION_ARGS)
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{
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tsvector *txt = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
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float res = 0.0;
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int method = DEF_NORM_METHOD;
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if (PG_NARGS() == 3)
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method = PG_GETARG_INT32(2);
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res = calc_rank(weights, txt, query, method);
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PG_FREE_IF_COPY(txt, 0);
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PG_FREE_IF_COPY(query, 1);
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PG_RETURN_FLOAT4(res);
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}
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typedef struct
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{
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ITEM *item;
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int32 pos;
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} DocRepresentation;
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static int
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compareDocR(const void *a, const void *b)
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{
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if (((DocRepresentation *) a)->pos == ((DocRepresentation *) b)->pos)
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return 1;
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return (((DocRepresentation *) a)->pos > ((DocRepresentation *) b)->pos) ? 1 : -1;
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}
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typedef struct
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{
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DocRepresentation *doc;
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int len;
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} ChkDocR;
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static bool
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checkcondition_DR(void *checkval, ITEM * val)
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{
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DocRepresentation *ptr = ((ChkDocR *) checkval)->doc;
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while (ptr - ((ChkDocR *) checkval)->doc < ((ChkDocR *) checkval)->len)
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{
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if (val == ptr->item)
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return true;
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ptr++;
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}
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return false;
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}
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static bool
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Cover(DocRepresentation * doc, int len, QUERYTYPE * query, int *pos, int *p, int *q)
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{
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int i;
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DocRepresentation *ptr,
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*f = (DocRepresentation *) 0xffffffff;
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ITEM *item = GETQUERY(query);
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int lastpos = *pos;
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int oldq = *q;
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*p = 0x7fffffff;
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*q = 0;
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for (i = 0; i < query->size; i++)
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{
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if (item->type != VAL)
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{
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item++;
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continue;
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}
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ptr = doc + *pos;
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while (ptr - doc < len)
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{
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if (ptr->item == item)
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{
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if (ptr->pos > *q)
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{
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*q = ptr->pos;
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lastpos = ptr - doc;
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}
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break;
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}
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ptr++;
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}
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item++;
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}
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if (*q == 0)
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return false;
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if (*q == oldq)
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{ /* already check this pos */
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(*pos)++;
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return Cover(doc, len, query, pos, p, q);
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}
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item = GETQUERY(query);
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for (i = 0; i < query->size; i++)
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{
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if (item->type != VAL)
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{
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item++;
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continue;
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}
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ptr = doc + lastpos;
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while (ptr >= doc + *pos)
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{
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if (ptr->item == item)
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{
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if (ptr->pos < *p)
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{
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*p = ptr->pos;
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f = ptr;
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}
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break;
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}
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ptr--;
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}
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item++;
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}
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if (*p <= *q)
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{
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ChkDocR ch;
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ch.doc = f;
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ch.len = (doc + lastpos) - f + 1;
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*pos = f - doc + 1;
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if (TS_execute(GETQUERY(query), &ch, false, checkcondition_DR))
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{
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/*
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* elog(NOTICE,"OP:%d NP:%d P:%d Q:%d", *pos, lastpos, *p,
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* *q);
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*/
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return true;
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}
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else
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return Cover(doc, len, query, pos, p, q);
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}
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return false;
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}
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static DocRepresentation *
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get_docrep(tsvector * txt, QUERYTYPE * query, int *doclen)
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{
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ITEM *item = GETQUERY(query);
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WordEntry *entry;
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WordEntryPos *post;
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int4 dimt,
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j,
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i;
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int len = query->size * 4,
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cur = 0;
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DocRepresentation *doc;
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*(uint16 *) POSNULL = lengthof(POSNULL) - 1;
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doc = (DocRepresentation *) palloc(sizeof(DocRepresentation) * len);
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for (i = 0; i < query->size; i++)
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{
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if (item[i].type != VAL)
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continue;
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entry = find_wordentry(txt, query, &(item[i]));
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if (!entry)
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continue;
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if (entry->haspos)
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{
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dimt = POSDATALEN(txt, entry);
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post = POSDATAPTR(txt, entry);
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}
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else
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{
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dimt = *(uint16 *) POSNULL;
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post = POSNULL + 1;
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}
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while (cur + dimt >= len)
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{
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len *= 2;
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doc = (DocRepresentation *) repalloc(doc, sizeof(DocRepresentation) * len);
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}
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for (j = 0; j < dimt; j++)
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{
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doc[cur].item = &(item[i]);
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doc[cur].pos = post[j].pos;
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cur++;
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}
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}
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*doclen = cur;
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if (cur > 0)
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{
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if (cur > 1)
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qsort((void *) doc, cur, sizeof(DocRepresentation), compareDocR);
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return doc;
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}
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pfree(doc);
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return NULL;
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}
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Datum
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rank_cd(PG_FUNCTION_ARGS)
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{
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int K = PG_GETARG_INT32(0);
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tsvector *txt = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_DATUM(2));
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int method = DEF_NORM_METHOD;
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DocRepresentation *doc;
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float res = 0.0;
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int p = 0,
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q = 0,
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len,
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cur;
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doc = get_docrep(txt, query, &len);
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if (!doc)
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{
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PG_FREE_IF_COPY(txt, 1);
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PG_FREE_IF_COPY(query, 2);
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PG_RETURN_FLOAT4(0.0);
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}
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cur = 0;
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if (K <= 0)
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K = 4;
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while (Cover(doc, len, query, &cur, &p, &q))
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res += (q - p + 1 > K) ? ((float) K) / ((float) (q - p + 1)) : 1.0;
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if (PG_NARGS() == 4)
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method = PG_GETARG_INT32(3);
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switch (method)
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{
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case 0:
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break;
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case 1:
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res /= log((float) cnt_length(txt));
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break;
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case 2:
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res /= (float) cnt_length(txt);
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break;
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default:
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/* internal error */
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elog(ERROR, "unrecognized normalization method: %d", method);
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}
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pfree(doc);
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PG_FREE_IF_COPY(txt, 1);
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PG_FREE_IF_COPY(query, 2);
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PG_RETURN_FLOAT4(res);
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}
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Datum
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rank_cd_def(PG_FUNCTION_ARGS)
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{
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PG_RETURN_DATUM(DirectFunctionCall4(
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rank_cd,
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Int32GetDatum(-1),
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PG_GETARG_DATUM(0),
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PG_GETARG_DATUM(1),
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(PG_NARGS() == 3) ? PG_GETARG_DATUM(2) : Int32GetDatum(DEF_NORM_METHOD)
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));
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}
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/**************debug*************/
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typedef struct
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{
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char *w;
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int2 len;
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int2 pos;
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int2 start;
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int2 finish;
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} DocWord;
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static int
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compareDocWord(const void *a, const void *b)
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{
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if (((DocWord *) a)->pos == ((DocWord *) b)->pos)
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return 1;
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return (((DocWord *) a)->pos > ((DocWord *) b)->pos) ? 1 : -1;
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}
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Datum
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get_covers(PG_FUNCTION_ARGS)
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{
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tsvector *txt = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
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WordEntry *pptr = ARRPTR(txt);
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int i,
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dlen = 0,
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j,
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cur = 0,
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len = 0,
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rlen;
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DocWord *dw,
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*dwptr;
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text *out;
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char *cptr;
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DocRepresentation *doc;
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int pos = 0,
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p,
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q,
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olddwpos = 0;
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int ncover = 1;
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doc = get_docrep(txt, query, &rlen);
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if (!doc)
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{
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out = palloc(VARHDRSZ);
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VARATT_SIZEP(out) = VARHDRSZ;
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PG_FREE_IF_COPY(txt, 0);
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PG_FREE_IF_COPY(query, 1);
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PG_RETURN_POINTER(out);
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}
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for (i = 0; i < txt->size; i++)
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{
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if (!pptr[i].haspos)
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("no pos info")));
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dlen += POSDATALEN(txt, &(pptr[i]));
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}
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dwptr = dw = palloc(sizeof(DocWord) * dlen);
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memset(dw, 0, sizeof(DocWord) * dlen);
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for (i = 0; i < txt->size; i++)
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{
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WordEntryPos *posdata = POSDATAPTR(txt, &(pptr[i]));
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for (j = 0; j < POSDATALEN(txt, &(pptr[i])); j++)
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{
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dw[cur].w = STRPTR(txt) + pptr[i].pos;
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dw[cur].len = pptr[i].len;
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dw[cur].pos = posdata[j].pos;
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cur++;
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}
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len += (pptr[i].len + 1) * (int) POSDATALEN(txt, &(pptr[i]));
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}
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qsort((void *) dw, dlen, sizeof(DocWord), compareDocWord);
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while (Cover(doc, rlen, query, &pos, &p, &q))
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{
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dwptr = dw + olddwpos;
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while (dwptr->pos < p && dwptr - dw < dlen)
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dwptr++;
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olddwpos = dwptr - dw;
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dwptr->start = ncover;
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while (dwptr->pos < q + 1 && dwptr - dw < dlen)
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dwptr++;
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(dwptr - 1)->finish = ncover;
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len += 4 /* {}+two spaces */ + 2 * 16 /* numbers */ ;
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ncover++;
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}
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out = palloc(VARHDRSZ + len);
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cptr = ((char *) out) + VARHDRSZ;
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dwptr = dw;
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while (dwptr - dw < dlen)
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{
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if (dwptr->start)
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{
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sprintf(cptr, "{%d ", dwptr->start);
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cptr = strchr(cptr, '\0');
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}
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memcpy(cptr, dwptr->w, dwptr->len);
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cptr += dwptr->len;
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*cptr = ' ';
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cptr++;
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if (dwptr->finish)
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{
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sprintf(cptr, "}%d ", dwptr->finish);
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cptr = strchr(cptr, '\0');
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}
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dwptr++;
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}
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VARATT_SIZEP(out) = cptr - ((char *) out);
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pfree(dw);
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pfree(doc);
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PG_FREE_IF_COPY(txt, 0);
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PG_FREE_IF_COPY(query, 1);
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PG_RETURN_POINTER(out);
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}
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