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Create a selectivity estimation function for the text search @@ operator.

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Jan Urbanski
This commit is contained in:
Tom Lane
2008-09-19 19:03:41 +00:00
parent e2b7d0c65c
commit 4e57668da4
9 changed files with 465 additions and 32 deletions
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5
doc/src/sgml/catalogs.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.174 2008/09/15 18:43:41 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.175 2008/09/19 19:03:40 tgl Exp $ -->
<!--
Documentation of the system catalogs, directed toward PostgreSQL developers
-->
@ -6664,6 +6664,9 @@
A list of the frequencies of the most common values or elements,
i.e., number of occurrences of each divided by total number of rows.
(NULL when <structfield>most_common_vals</structfield> is.)
For some datatypes such as <type>tsvector</>, it can also store some
additional information, making it longer than the
<structfield>most_common_vals</> array.
</entry>
</row>