From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 15 Dec 2008 15:06:31 +0000 (+0000)
Subject: Reduce the scaling factor for attstattarget to number-of-lexemes from 100
X-Git-Tag: recoveryinfrav9~207
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=403777de06abc293bf06baea7614127485fcf736;p=users%2Fsimon%2Fpostgres.git

Reduce the scaling factor for attstattarget to number-of-lexemes from 100
to 10, to compensate for the recent change in default statistics target.
The original number was pulled out of the air anyway :-(, but it was picked
in the context of the old default, so holding the default size of the
MCELEM array constant seems the best thing.  Per discussion.
---

diff --git a/src/backend/tsearch/ts_typanalyze.c b/src/backend/tsearch/ts_typanalyze.c
index b812fd1631..a98a19f405 100644
--- a/src/backend/tsearch/ts_typanalyze.c
+++ b/src/backend/tsearch/ts_typanalyze.c
@@ -105,7 +105,7 @@ ts_typanalyze(PG_FUNCTION_ARGS)
  *	is no more than a few times w.
  *
  *	We use a hashtable for the D structure and a bucket width of
- *	statistics_target * 100, where 100 is an arbitrarily chosen constant,
+ *	statistics_target * 10, where 10 is an arbitrarily chosen constant,
  *	meant to approximate the number of lexemes in a single tsvector.
  */
 static void
@@ -130,8 +130,8 @@ compute_tsvector_stats(VacAttrStats *stats,
 	LexemeHashKey 	hash_key;
 	TrackItem		*item;
 
-	/* We want statistics_target * 100 lexemes in the MCELEM array */
-	num_mcelem = stats->attr->attstattarget * 100;
+	/* We want statistics_target * 10 lexemes in the MCELEM array */
+	num_mcelem = stats->attr->attstattarget * 10;
 
 	/*
 	 * We set bucket width equal to the target number of result lexemes.