database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-02 09:02:37 +03:00
Code Activity

Add reusable routine for making arrays unique.

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

29
src/backend/utils/adt/tsgistidx.c
View File

@ -16,6 +16,7 @@
#include "access/gist.h"
#include "access/heaptoast.h"
#include "lib/qunique.h"
#include "port/pg_bitutils.h"
#include "tsearch/ts_utils.h"
#include "utils/builtins.h"
@ -122,31 +123,6 @@ compareint(const void *va, const void *vb)
return (a > b) ? 1 : -1;
}
/*
* Removes duplicates from an array of int32. 'l' is
* size of the input array. Returns the new size of the array.
*/
static int
uniqueint(int32 *a, int32 l)
{
int32 *ptr,
*res;
if (l <= 1)
return l;
ptr = res = a;
qsort((void *) a, l, sizeof(int32), compareint);
while (ptr - a < l)
if (*ptr != *res)
*(++res) = *ptr++;
else
ptr++;
return res + 1 - a;
}
static void
makesign(BITVECP sign, SignTSVector *a)
{
@ -193,7 +169,8 @@ gtsvector_compress(PG_FUNCTION_ARGS)
ptr++;
}
len = uniqueint(GETARR(res), val->size);
qsort(GETARR(res), val->size, sizeof(int), compareint);
len = qunique(GETARR(res), val->size, sizeof(int), compareint);
if (len != val->size)
{
/*