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Avoid overflow in cost_sort when work_mem exceeds 1Gb.

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This commit is contained in:
Tom Lane 2004-10-23 00:05:27 +00:00
parent 6e3cc2029d
commit 529db99c6e
1 changed files with 2 additions and 2 deletions
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4
src/backend/optimizer/path/costsize.c
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@ -49,7 +49,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.134 2004/08/29 05:06:43 momjian Exp $ * $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.135 2004/10/23 00:05:27 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -566,7 +566,7 @@ cost_sort(Path *path, Query *root,
if (nbytes > work_mem_bytes) if (nbytes > work_mem_bytes)
{ {
double npages = ceil(nbytes / BLCKSZ); double npages = ceil(nbytes / BLCKSZ);
double nruns = nbytes / (work_mem_bytes * 2); double nruns = (nbytes / work_mem_bytes) * 0.5;
double log_runs = ceil(LOG6(nruns)); double log_runs = ceil(LOG6(nruns));
double npageaccesses; double npageaccesses;