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06d9afa6f9
The array intersection code would give wrong results if the first entry of the correct output array would be "1". (I think only this value could be at risk, since the previous word would always be a lower-bound entry with that fixed value.) Problem spotted by Julien Rouhaud, initial patch by Guillaume Lelarge, cosmetic improvements by me.
404 lines
6.2 KiB
C
404 lines
6.2 KiB
C
/*
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* contrib/intarray/_int_tool.c
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*/
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#include "postgres.h"
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#include "catalog/pg_type.h"
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#include "_int.h"
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/* arguments are assumed sorted & unique-ified */
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bool
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inner_int_contains(ArrayType *a, ArrayType *b)
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{
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int na,
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nb;
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int i,
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j,
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n;
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int *da,
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*db;
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na = ARRNELEMS(a);
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nb = ARRNELEMS(b);
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da = ARRPTR(a);
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db = ARRPTR(b);
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i = j = n = 0;
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while (i < na && j < nb)
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{
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if (da[i] < db[j])
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i++;
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else if (da[i] == db[j])
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{
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n++;
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i++;
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j++;
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}
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else
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break; /* db[j] is not in da */
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}
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return (n == nb) ? TRUE : FALSE;
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}
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/* arguments are assumed sorted */
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bool
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inner_int_overlap(ArrayType *a, ArrayType *b)
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{
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int na,
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nb;
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int i,
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j;
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int *da,
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*db;
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na = ARRNELEMS(a);
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nb = ARRNELEMS(b);
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da = ARRPTR(a);
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db = ARRPTR(b);
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i = j = 0;
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while (i < na && j < nb)
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{
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if (da[i] < db[j])
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i++;
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else if (da[i] == db[j])
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return TRUE;
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else
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j++;
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}
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return FALSE;
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}
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ArrayType *
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inner_int_union(ArrayType *a, ArrayType *b)
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{
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ArrayType *r = NULL;
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CHECKARRVALID(a);
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CHECKARRVALID(b);
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if (ARRISEMPTY(a) && ARRISEMPTY(b))
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return new_intArrayType(0);
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if (ARRISEMPTY(a))
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r = copy_intArrayType(b);
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if (ARRISEMPTY(b))
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r = copy_intArrayType(a);
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if (!r)
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{
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int na = ARRNELEMS(a),
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nb = ARRNELEMS(b);
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int *da = ARRPTR(a),
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*db = ARRPTR(b);
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int i,
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j,
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*dr;
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r = new_intArrayType(na + nb);
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dr = ARRPTR(r);
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/* union */
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i = j = 0;
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while (i < na && j < nb)
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{
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if (da[i] == db[j])
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{
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*dr++ = da[i++];
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j++;
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}
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else if (da[i] < db[j])
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*dr++ = da[i++];
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else
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*dr++ = db[j++];
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}
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while (i < na)
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*dr++ = da[i++];
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while (j < nb)
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*dr++ = db[j++];
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r = resize_intArrayType(r, dr - ARRPTR(r));
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}
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if (ARRNELEMS(r) > 1)
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r = _int_unique(r);
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return r;
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}
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ArrayType *
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inner_int_inter(ArrayType *a, ArrayType *b)
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{
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ArrayType *r;
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int na,
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nb;
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int *da,
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*db,
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*dr;
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int i,
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j,
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k;
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if (ARRISEMPTY(a) || ARRISEMPTY(b))
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return new_intArrayType(0);
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na = ARRNELEMS(a);
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nb = ARRNELEMS(b);
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da = ARRPTR(a);
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db = ARRPTR(b);
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r = new_intArrayType(Min(na, nb));
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dr = ARRPTR(r);
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i = j = k = 0;
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while (i < na && j < nb)
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{
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if (da[i] < db[j])
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i++;
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else if (da[i] == db[j])
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{
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if (k == 0 || dr[k - 1] != db[j])
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dr[k++] = db[j];
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i++;
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j++;
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}
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else
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j++;
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}
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if (k == 0)
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{
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pfree(r);
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return new_intArrayType(0);
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}
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else
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return resize_intArrayType(r, k);
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}
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void
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rt__int_size(ArrayType *a, float *size)
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{
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*size = (float) ARRNELEMS(a);
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}
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/* Sort the given data (len >= 2). Return true if any duplicates found */
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bool
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isort(int4 *a, int len)
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{
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int4 cur,
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prev;
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int4 *pcur,
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*pprev,
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*end;
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bool r = FALSE;
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/*
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* We use a simple insertion sort. While this is O(N^2) in the worst
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* case, it's quite fast if the input is already sorted or nearly so.
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* Also, for not-too-large inputs it's faster than more complex methods
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* anyhow.
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*/
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end = a + len;
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for (pcur = a + 1; pcur < end; pcur++)
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{
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cur = *pcur;
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for (pprev = pcur - 1; pprev >= a; pprev--)
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{
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prev = *pprev;
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if (prev <= cur)
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{
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if (prev == cur)
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r = TRUE;
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break;
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}
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pprev[1] = prev;
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}
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pprev[1] = cur;
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}
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return r;
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}
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/* Create a new int array with room for "num" elements */
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ArrayType *
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new_intArrayType(int num)
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{
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ArrayType *r;
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int nbytes = ARR_OVERHEAD_NONULLS(1) + sizeof(int) * num;
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r = (ArrayType *) palloc0(nbytes);
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SET_VARSIZE(r, nbytes);
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ARR_NDIM(r) = 1;
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r->dataoffset = 0; /* marker for no null bitmap */
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ARR_ELEMTYPE(r) = INT4OID;
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ARR_DIMS(r)[0] = num;
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ARR_LBOUND(r)[0] = 1;
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return r;
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}
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ArrayType *
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resize_intArrayType(ArrayType *a, int num)
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{
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int nbytes = ARR_DATA_OFFSET(a) + sizeof(int) * num;
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int i;
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if (num == ARRNELEMS(a))
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return a;
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a = (ArrayType *) repalloc(a, nbytes);
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SET_VARSIZE(a, nbytes);
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/* usually the array should be 1-D already, but just in case ... */
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for (i = 0; i < ARR_NDIM(a); i++)
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{
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ARR_DIMS(a)[i] = num;
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num = 1;
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}
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return a;
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}
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ArrayType *
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copy_intArrayType(ArrayType *a)
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{
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ArrayType *r;
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int n = ARRNELEMS(a);
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r = new_intArrayType(n);
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memcpy(ARRPTR(r), ARRPTR(a), n * sizeof(int4));
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return r;
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}
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/* num for compressed key */
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int
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internal_size(int *a, int len)
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{
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int i,
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size = 0;
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for (i = 0; i < len; i += 2)
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{
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if (!i || a[i] != a[i - 1]) /* do not count repeated range */
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size += a[i + 1] - a[i] + 1;
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}
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return size;
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}
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/* unique-ify elements of r in-place ... r must be sorted already */
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ArrayType *
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_int_unique(ArrayType *r)
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{
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int *tmp,
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*dr,
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*data;
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int num = ARRNELEMS(r);
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if (num < 2)
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return r;
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data = tmp = dr = ARRPTR(r);
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while (tmp - data < num)
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{
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if (*tmp != *dr)
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*(++dr) = *tmp++;
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else
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tmp++;
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}
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return resize_intArrayType(r, dr + 1 - ARRPTR(r));
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}
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void
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gensign(BITVEC sign, int *a, int len)
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{
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int i;
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/* we assume that the sign vector is previously zeroed */
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for (i = 0; i < len; i++)
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{
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HASH(sign, *a);
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a++;
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}
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}
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int32
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intarray_match_first(ArrayType *a, int32 elem)
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{
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int32 *aa,
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c,
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i;
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CHECKARRVALID(a);
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c = ARRNELEMS(a);
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aa = ARRPTR(a);
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for (i = 0; i < c; i++)
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if (aa[i] == elem)
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return (i + 1);
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return 0;
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}
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ArrayType *
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intarray_add_elem(ArrayType *a, int32 elem)
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{
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ArrayType *result;
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int32 *r;
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int32 c;
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CHECKARRVALID(a);
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c = ARRNELEMS(a);
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result = new_intArrayType(c + 1);
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r = ARRPTR(result);
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if (c > 0)
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memcpy(r, ARRPTR(a), c * sizeof(int32));
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r[c] = elem;
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return result;
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}
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ArrayType *
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intarray_concat_arrays(ArrayType *a, ArrayType *b)
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{
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ArrayType *result;
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int32 ac = ARRNELEMS(a);
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int32 bc = ARRNELEMS(b);
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CHECKARRVALID(a);
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CHECKARRVALID(b);
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result = new_intArrayType(ac + bc);
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if (ac)
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memcpy(ARRPTR(result), ARRPTR(a), ac * sizeof(int32));
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if (bc)
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memcpy(ARRPTR(result) + ac, ARRPTR(b), bc * sizeof(int32));
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return result;
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}
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ArrayType *
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int_to_intset(int32 n)
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{
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ArrayType *result;
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int32 *aa;
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result = new_intArrayType(1);
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aa = ARRPTR(result);
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aa[0] = n;
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return result;
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}
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int
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compASC(const void *a, const void *b)
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{
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if (*(const int4 *) a == *(const int4 *) b)
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return 0;
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return (*(const int4 *) a > *(const int4 *) b) ? 1 : -1;
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}
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int
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compDESC(const void *a, const void *b)
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{
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if (*(const int4 *) a == *(const int4 *) b)
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return 0;
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return (*(const int4 *) a < *(const int4 *) b) ? 1 : -1;
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}
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