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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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13
src/backend/executor/nodeTidscan.c
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@ -27,6 +27,7 @@
#include "catalog/pg_type.h"
#include "executor/execdebug.h"
#include "executor/nodeTidscan.h"
#include "lib/qunique.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "storage/bufmgr.h"
@ -260,21 +261,13 @@ TidListEval(TidScanState *tidstate)
*/
if (numTids > 1)
{
int lastTid;
int i;
/* CurrentOfExpr could never appear OR'd with something else */
Assert(!tidstate->tss_isCurrentOf);
qsort((void *) tidList, numTids, sizeof(ItemPointerData),
itemptr_comparator);
lastTid = 0;
for (i = 1; i < numTids; i++)
{
if (!ItemPointerEquals(&tidList[lastTid], &tidList[i]))
tidList[++lastTid] = tidList[i];
}
numTids = lastTid + 1;
numTids = qunique(tidList, numTids, sizeof(ItemPointerData),
itemptr_comparator);
}
tidstate->tss_TidList = tidList;