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Commit301194f

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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 pickedin the context of the old default, so holding the default size of theMCELEM array constant seems the best thing. Per discussion.
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‎src/backend/tsearch/ts_typanalyze.c

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/backend/tsearch/ts_typanalyze.c,v 1.4 2008/12/13 19:13:44 tgl Exp $
10+
* $PostgreSQL: pgsql/src/backend/tsearch/ts_typanalyze.c,v 1.5 2008/12/15 15:06:31 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -105,7 +105,7 @@ ts_typanalyze(PG_FUNCTION_ARGS)
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*is no more than a few times w.
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*
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*We use a hashtable for the D structure and a bucket width of
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*statistics_target *100, where100 is an arbitrarily chosen constant,
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*statistics_target *10, where10 is an arbitrarily chosen constant,
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*meant to approximate the number of lexemes in a single tsvector.
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*/
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staticvoid
@@ -130,8 +130,8 @@ compute_tsvector_stats(VacAttrStats *stats,
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LexemeHashKeyhash_key;
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TrackItem*item;
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133-
/* We want statistics_target *100 lexemes in the MCELEM array */
134-
num_mcelem=stats->attr->attstattarget*100;
133+
/* We want statistics_target *10 lexemes in the MCELEM array */
134+
num_mcelem=stats->attr->attstattarget*10;
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/*
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* We set bucket width equal to the target number of result lexemes.

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