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getattnvals(): if attnvals in pg_attribute is 0 then use 

ATTNVALS_SCALE/reltuples (instead of reltuples).
This commit is contained in:
Vadim B. Mikheev 1997-04-09 02:20:32 +00:00
parent 610d0d00ed
commit 2fd9273d97
1 changed files with 10 additions and 1 deletions
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11
src/backend/utils/adt/selfuncs.c
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@ -12,7 +12,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.5 1997/02/07 16:23:39 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.6 1997/04/09 02:20:32 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -291,6 +291,15 @@ getattnvals(Oid relid, AttrNumber attnum)
return(0);
}
nvals = ((Form_pg_class) GETSTRUCT(atp))->reltuples;
/* Look above how nvals is used. - vadim 04/09/97 */
if ( nvals > 0 )
{
double selratio = 1.0 / (double)nvals;
selratio *= (double)ATTNVALS_SCALE;
nvals = (int) ceil (selratio);
}
return(nvals);
}