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Commit6f6d863

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Create a type-specific typanalyze routine for tsvector, which collects stats
on the most common individual lexemes in place of the mostly-useless defaultbehavior of counting duplicate tsvectors. Future work: create selectivityestimation functions that actually do something with these stats.(Some other things we ought to look at doing: using the Lossy Countingalgorithm in compute_minimal_stats, and using the element-counting idea forstats on regular arrays.)Jan Urbanski
1 parent6816577 commit6f6d863

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11 files changed

+467
-41
lines changed

11 files changed

+467
-41
lines changed

‎doc/src/sgml/catalogs.sgml‎

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@@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.167 2008/07/11 07:02:43 petere Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.168 2008/07/14 00:51:45 tgl Exp $ -->
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<!--
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Documentation of the system catalogs, directed toward PostgreSQL developers
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-->
@@ -6516,6 +6516,8 @@
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<entry>
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A list of the most common values in the column. (NULL if
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no values seem to be more common than any others.)
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For some datatypes such as <type>tsvector</>, this is a list of
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the most common element values rather than values of the type itself.
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</entry>
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</row>
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@@ -6524,10 +6526,10 @@
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<entry><type>real[]</type></entry>
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<entry></entry>
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<entry>
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A list of the frequencies of the most common values,
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A list of the frequencies of the most common values or elements,
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i.e., number of occurrences of each divided by total number of rows.
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(NULL when <structfield>most_common_vals</structfield> is.)
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</entry>
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</entry>
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</row>
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<row>

‎src/backend/catalog/system_views.sql‎

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@@ -3,7 +3,7 @@
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*
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* Copyright (c) 1996-2008, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/catalog/system_views.sql,v 1.52 2008/05/15 00:17:39 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/catalog/system_views.sql,v 1.53 2008/07/14 00:51:45 tgl Exp $
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*/
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CREATEVIEWpg_rolesAS
@@ -110,30 +110,30 @@ CREATE VIEW pg_stats AS
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stanullfracAS null_frac,
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stawidthAS avg_width,
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stadistinctAS n_distinct,
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CASE1
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WHEN stakind1 THEN stavalues1
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WHEN stakind2 THEN stavalues2
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WHEN stakind3 THEN stavalues3
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WHEN stakind4 THEN stavalues4
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ENDAS most_common_vals,
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CASE1
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WHEN stakind1 THEN stanumbers1
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WHEN stakind2 THEN stanumbers2
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WHEN stakind3 THEN stanumbers3
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WHEN stakind4 THEN stanumbers4
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ENDAS most_common_freqs,
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CASE2
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WHEN stakind1 THEN stavalues1
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WHEN stakind2 THEN stavalues2
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WHEN stakind3 THEN stavalues3
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WHEN stakind4 THEN stavalues4
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ENDAS histogram_bounds,
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CASE3
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WHEN stakind1 THEN stanumbers1[1]
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WHEN stakind2 THEN stanumbers2[1]
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WHEN stakind3 THEN stanumbers3[1]
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WHEN stakind4 THEN stanumbers4[1]
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ENDAS correlation
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CASE
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WHEN stakind1IN (1,4)THEN stavalues1
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WHEN stakind2IN (1,4)THEN stavalues2
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WHEN stakind3IN (1,4)THEN stavalues3
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WHEN stakind4IN (1,4)THEN stavalues4
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ENDAS most_common_vals,
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CASE
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WHEN stakind1IN (1,4)THEN stanumbers1
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WHEN stakind2IN (1,4)THEN stanumbers2
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WHEN stakind3IN (1,4)THEN stanumbers3
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WHEN stakind4IN (1,4)THEN stanumbers4
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ENDAS most_common_freqs,
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CASE
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WHEN stakind1=2THEN stavalues1
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WHEN stakind2=2THEN stavalues2
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WHEN stakind3=2THEN stavalues3
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WHEN stakind4=2THEN stavalues4
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ENDAS histogram_bounds,
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CASE
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WHEN stakind1=3THEN stanumbers1[1]
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WHEN stakind2=3THEN stanumbers2[1]
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WHEN stakind3=3THEN stanumbers3[1]
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WHEN stakind4=3THEN stanumbers4[1]
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ENDAS correlation
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FROM pg_statistic sJOIN pg_class cON (c.oid=s.starelid)
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JOIN pg_attribute aON (c.oid= attrelidAND attnum=s.staattnum)
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LEFT JOIN pg_namespace nON (n.oid=c.relnamespace)

‎src/backend/tsearch/Makefile‎

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@@ -4,7 +4,7 @@
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#
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# Copyright (c) 2006-2008, PostgreSQL Global Development Group
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#
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# $PostgreSQL: pgsql/src/backend/tsearch/Makefile,v 1.6 2008/02/19 10:30:08 petere Exp $
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# $PostgreSQL: pgsql/src/backend/tsearch/Makefile,v 1.7 2008/07/14 00:51:45 tgl Exp $
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#
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#-------------------------------------------------------------------------
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subdir = src/backend/tsearch
@@ -19,7 +19,7 @@ DICTFILES=synonym_sample.syn thesaurus_sample.ths hunspell_sample.affix \
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OBJS = ts_locale.o ts_parse.o wparser.o wparser_def.o dict.o\
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dict_simple.o dict_synonym.o dict_thesaurus.o\
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dict_ispell.o regis.o spell.o\
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to_tsany.o ts_utils.o
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to_tsany.ots_typanalyze.ots_utils.o
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include$(top_srcdir)/src/backend/common.mk
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