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Add reusable routine for making arrays unique.

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Introduce qunique() and qunique_arg(), which can be used after qsort()
and qsort_arg() respectively to remove duplicate values.  Use it where
appropriate.

Author: Thomas Munro
Reviewed-by: Tom Lane (in an earlier version)
Discussion: https://postgr.es/m/CAEepm%3D2vmFTNpAmwbGGD2WaryM6T3hSDVKQPfUwjdD_5XY6vAA%40mail.gmail.com
This commit is contained in:
Thomas Munro
2019-11-07 16:51:04 +13:00
parent 3feb6ace7c
commit 7815e7efdb
13 changed files with 115 additions and 208 deletions
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19
contrib/intarray/_int_tool.c
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@ -7,6 +7,7 @@
#include "_int.h"
#include "catalog/pg_type.h"
#include "lib/qunique.h"
/* arguments are assumed sorted & unique-ified */
bool
@ -308,23 +309,13 @@ internal_size(int *a, int len)
ArrayType *
_int_unique(ArrayType *r)
{
int *tmp,
*dr,
*data;
int num = ARRNELEMS(r);
bool duplicates_found; /* not used */
if (num < 2)
return r;
num = qunique_arg(ARRPTR(r), num, sizeof(int), isort_cmp,
&duplicates_found);
data = tmp = dr = ARRPTR(r);
while (tmp - data < num)
{
if (*tmp != *dr)
*(++dr) = *tmp++;
else
tmp++;
}
return resize_intArrayType(r, dr + 1 - ARRPTR(r));
return resize_intArrayType(r, num);
}
void