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Add attribute optimization statistics.

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This commit is contained in:
Bruce Momjian
1997-02-07 16:24:12 +00:00
parent 4c0faba0fe
commit 2300ac0dc4
7 changed files with 580 additions and 224 deletions
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9
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 1.4 1996/11/03 06:53:08 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.5 1997/02/07 16:23:39 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -33,6 +33,7 @@
#include "utils/lsyscache.h" /* for get_oprrest() */
#include "catalog/pg_statistic.h"
#include "commands/vacuum.h" /* for ATTNVALS_SCALE */
/* N is not a valid var/constant or relation id */
#define NONVALUE(N) ((N) == -1)
@ -68,7 +69,7 @@ eqsel(Oid opid,
if (nvals == 0)
*result = 0.0;
else
*result = 1.0 / nvals;
*result = ((float64data)nvals) / ((float64data)ATTNVALS_SCALE);
}
return(result);
}
@ -125,7 +126,7 @@ intltsel(Oid opid,
if (nvals == 0)
*result = 1.0 / 3.0;
else
*result = 3.0 / nvals;
*result = 3.0 * ((float64data)nvals) / ((float64data)ATTNVALS_SCALE);
}else {
bottom = high - low;
if (bottom == 0)
@ -192,7 +193,7 @@ eqjoinsel(Oid opid,
if (max == 0)
*result = 1.0;
else
*result = 1.0 / max;
*result = ((float64data)max) / ((float64data)ATTNVALS_SCALE);
}
return(result);
}