diff options
Diffstat (limited to 'src/backend/utils')
| -rw-r--r-- | src/backend/utils/adt/selfuncs.c | 12 | ||||
| -rw-r--r-- | src/backend/utils/cache/lsyscache.c | 36 |
2 files changed, 24 insertions, 24 deletions
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c index 55b0273eb8b..f68b43badaf 100644 --- a/src/backend/utils/adt/selfuncs.c +++ b/src/backend/utils/adt/selfuncs.c @@ -15,7 +15,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.79 2000/09/15 18:45:26 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.80 2000/10/05 19:48:28 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -230,11 +230,11 @@ eqsel(PG_FUNCTION_ARGS) /* * No VACUUM ANALYZE stats available, so make a guess using - * the disbursion stat (if we have that, which is unlikely for + * the dispersion stat (if we have that, which is unlikely for * a normal attribute; but for a system attribute we may be * able to estimate it). */ - selec = get_attdisbursion(relid, attno, 0.01); + selec = get_attdispersion(relid, attno, 0.01); } result = (float8) selec; @@ -655,8 +655,8 @@ eqjoinsel(PG_FUNCTION_ARGS) result = DEFAULT_EQ_SEL; else { - num1 = unknown1 ? 1.0 : get_attdisbursion(relid1, attno1, 0.01); - num2 = unknown2 ? 1.0 : get_attdisbursion(relid2, attno2, 0.01); + num1 = unknown1 ? 1.0 : get_attdispersion(relid1, attno1, 0.01); + num2 = unknown2 ? 1.0 : get_attdispersion(relid2, attno2, 0.01); /* * The join selectivity cannot be more than num2, since each tuple @@ -666,7 +666,7 @@ eqjoinsel(PG_FUNCTION_ARGS) * reasoning it is not more than num1. The min is therefore an * upper bound. * - * If we know the disbursion of only one side, use it; the reasoning + * If we know the dispersion of only one side, use it; the reasoning * above still works. * * XXX can we make a better estimate here? Using the nullfrac diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c index 28910dae892..b9bd9f8b9e9 100644 --- a/src/backend/utils/cache/lsyscache.c +++ b/src/backend/utils/cache/lsyscache.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.45 2000/08/13 02:50:16 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.46 2000/10/05 19:48:29 momjian Exp $ * * NOTES * Eventually, the index information should go through here, too. @@ -168,9 +168,9 @@ get_atttypmod(Oid relid, AttrNumber attnum) } /* - * get_attdisbursion + * get_attdispersion * - * Retrieve the disbursion statistic for an attribute, + * Retrieve the dispersion statistic for an attribute, * or produce an estimate if no info is available. * * min_estimate is the minimum estimate to return if insufficient data @@ -180,11 +180,11 @@ get_atttypmod(Oid relid, AttrNumber attnum) * estimating the number of tuples produced by an equijoin.) */ double -get_attdisbursion(Oid relid, AttrNumber attnum, double min_estimate) +get_attdispersion(Oid relid, AttrNumber attnum, double min_estimate) { HeapTuple atp; Form_pg_attribute att_tup; - double disbursion; + double dispersion; int32 ntuples; atp = SearchSysCacheTuple(ATTNUM, @@ -194,18 +194,18 @@ get_attdisbursion(Oid relid, AttrNumber attnum, double min_estimate) if (!HeapTupleIsValid(atp)) { /* this should not happen */ - elog(ERROR, "get_attdisbursion: no attribute tuple %u %d", + elog(ERROR, "get_attdispersion: no attribute tuple %u %d", relid, attnum); return min_estimate; } att_tup = (Form_pg_attribute) GETSTRUCT(atp); - disbursion = att_tup->attdisbursion; - if (disbursion > 0.0) - return disbursion; /* we have a specific estimate from VACUUM */ + dispersion = att_tup->attdispersion; + if (dispersion > 0.0) + return dispersion; /* we have a specific estimate from VACUUM */ /* - * Special-case boolean columns: the disbursion of a boolean is highly + * Special-case boolean columns: the dispersion of a boolean is highly * unlikely to be anywhere near 1/numtuples, instead it's probably * more like 0.5. * @@ -215,7 +215,7 @@ get_attdisbursion(Oid relid, AttrNumber attnum, double min_estimate) return 0.5; /* - * Disbursion is either 0 (no data available) or -1 (disbursion is + * Dispersion is either 0 (no data available) or -1 (dispersion is * 1/numtuples). Either way, we need the relation size. */ @@ -225,7 +225,7 @@ get_attdisbursion(Oid relid, AttrNumber attnum, double min_estimate) if (!HeapTupleIsValid(atp)) { /* this should not happen */ - elog(ERROR, "get_attdisbursion: no relation tuple %u", relid); + elog(ERROR, "get_attdispersion: no relation tuple %u", relid); return min_estimate; } @@ -234,11 +234,11 @@ get_attdisbursion(Oid relid, AttrNumber attnum, double min_estimate) if (ntuples == 0) return min_estimate; /* no data available */ - if (disbursion < 0.0) /* VACUUM thinks there are no duplicates */ + if (dispersion < 0.0) /* VACUUM thinks there are no duplicates */ return 1.0 / (double) ntuples; /* - * VACUUM ANALYZE does not compute disbursion for system attributes, + * VACUUM ANALYZE does not compute dispersion for system attributes, * but some of them can reasonably be assumed unique anyway. */ if (attnum == ObjectIdAttributeNumber || @@ -252,11 +252,11 @@ get_attdisbursion(Oid relid, AttrNumber attnum, double min_estimate) * = 1/numtuples. This may produce unreasonably small estimates for * large tables, so limit the estimate to no less than min_estimate. */ - disbursion = 1.0 / (double) ntuples; - if (disbursion < min_estimate) - disbursion = min_estimate; + dispersion = 1.0 / (double) ntuples; + if (dispersion < min_estimate) + dispersion = min_estimate; - return disbursion; + return dispersion; } /* ---------- INDEX CACHE ---------- */ |