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Fix PDF doc build.

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Reported-by: Tom Lane
Discussion: https://postgr.es/m/608525.1737781222@sss.pgh.pa.us
This commit is contained in:
Jeff Davis 2025-01-25 00:12:30 -08:00
parent 38273b5f83
commit d2ca16bb50
1 changed files with 4 additions and 8 deletions
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12
doc/src/sgml/func.sgml
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@ -3120,19 +3120,15 @@ SELECT NOT(ROW(table.*) IS NOT NULL) FROM TABLE; -- detect at least one null in
<para>
Performs case folding of the input string according to the collation.
Case folding is similar to case conversion, but the purpose of case
folding is to facilitate case-insensitive comparison of strings,
folding is to facilitate case-insensitive matching of strings,
whereas the purpose of case conversion is to convert to a particular
cased form. This function can only be used when the server encoding
is <literal>UTF8</literal>.
</para>
<para>
Ordinarily, case folding simply converts to lowercase, but there are a
few notable exceptions depending on the collation. For instance, the
character <literal>Σ</literal> (U+03A3) has two lowercase forms:
<literal>σ</literal> (U+03C3) and <literal>ς</literal> (U+03C2); case
folding in the <literal>PG_C_UTF8</literal> collation maps all three
forms to <literal>σ</literal>. Additionally, the result is not
necessarily lowercase; some characters may be folded to uppercase.
Ordinarily, case folding simply converts to lowercase, but there may
be exceptions depending on the collation. For instance, some
characters have more than two lowercase variants, or fold to uppercase.
</para>
<para>
Case folding may change the length of the string. For instance, in