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Fix ts_rank_cd() to ignore stripped lexemes

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Previously, stripped lexemes got a default location and could be
considered if mixed with non-stripped lexemes.

BACKWARD INCOMPATIBILITY CHANGE
This commit is contained in:
Bruce Momjian
2014-03-24 14:36:36 -04:00
parent bb42e21be2
commit 1420f3a982
4 changed files with 30 additions and 5 deletions
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10
doc/src/sgml/textsearch.sgml
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@@ -889,9 +889,13 @@ SELECT plainto_tsquery('english', 'The Fat & Rats:C');
</para>
<para>
This function requires positional information in its input.
Therefore it will not work on <quote>stripped</> <type>tsvector</>
values &mdash; it will always return zero.
This function requires lexeme positional information to perform
its calculation. Therefore, it ignores any <quote>stripped</>
lexemes in the <type>tsvector</>. If there are no unstripped
lexemes in the input, the result will be zero. (See <xref
linkend="textsearch-manipulate-tsvector"> for more information
about the <function>strip</> function and positional information
in <type>tsvector</>s.)
</para>
</listitem>
</varlistentry>