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40b0c10b76
It's all very well to claim that a simplistic sort is fast in easy cases, but O(N^2) in the worst case is not good ... especially if the worst case is as easy to hit as "descending order input". Replace that bit with our standard qsort. Per bug #12866 from Maksym Boguk. Back-patch to all active branches.
402 lines
6.3 KiB
C
402 lines
6.3 KiB
C
/*
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* $PostgreSQL: pgsql/contrib/intarray/_int_tool.c,v 1.12 2009/06/11 14:48:51 momjian Exp $
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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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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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CHECKARRVALID(a);
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CHECKARRVALID(b);
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if (ARRISVOID(a) || ARRISVOID(b))
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return FALSE;
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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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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;
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return (n == nb) ? TRUE : FALSE;
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}
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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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CHECKARRVALID(a);
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CHECKARRVALID(b);
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if (ARRISVOID(a) || ARRISVOID(b))
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return FALSE;
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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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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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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 (ARRISVOID(a) && ARRISVOID(b))
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return new_intArrayType(0);
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if (ARRISVOID(a))
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r = copy_intArrayType(b);
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if (ARRISVOID(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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CHECKARRVALID(a);
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CHECKARRVALID(b);
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if (ARRISVOID(a) || ARRISVOID(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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return;
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}
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/* qsort_arg comparison function for isort() */
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static int
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isort_cmp(const void *a, const void *b, void *arg)
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{
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int4 aval = *((const int4 *) a);
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int4 bval = *((const int4 *) b);
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if (aval < bval)
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return -1;
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if (aval > bval)
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return 1;
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/*
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* Report if we have any duplicates. If there are equal keys, qsort must
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* compare them at some point, else it wouldn't know whether one should go
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* before or after the other.
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*/
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*((bool *) arg) = true;
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return 0;
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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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bool r = false;
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qsort_arg(a, len, sizeof(int4), isort_cmp, (void *) &r);
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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(NDIM) + 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) = NDIM;
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r->dataoffset = 0; /* marker for no null bitmap */
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ARR_ELEMTYPE(r) = INT4OID;
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*((int *) ARR_DIMS(r)) = num;
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*((int *) ARR_LBOUND(r)) = 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_OVERHEAD_NONULLS(NDIM) + sizeof(int) * num;
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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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*((int *) ARR_DIMS(a)) = num;
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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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r = new_intArrayType(ARRNELEMS(a));
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memmove(r, a, VARSIZE(r));
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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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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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return size;
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}
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/* r is sorted and size of r > 1 */
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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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CHECKARRVALID(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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if (*tmp != *dr)
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*(++dr) = *tmp++;
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else
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tmp++;
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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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if (ARRISVOID(a))
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return 0;
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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 = (ARRISVOID(a)) ? 0 : 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 = (ARRISVOID(a)) ? 0 : ARRNELEMS(a);
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int32 bc = (ARRISVOID(b)) ? 0 : 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 (*(int4 *) a == *(int4 *) b)
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return 0;
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return (*(int4 *) a > *(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 (*(int4 *) a == *(int4 *) b)
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return 0;
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return (*(int4 *) a < *(int4 *) b) ? 1 : -1;
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}
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