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Add more detail for non-TEXT cast release item.

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This commit is contained in:
Bruce Momjian 2007-11-15 20:10:32 +00:00
parent 166f67cebe
commit ee214defa0
1 changed files with 37 additions and 13 deletions
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50
doc/src/sgml/release.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.538 2007/11/15 17:09:40 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.539 2007/11/15 20:10:32 momjian Exp $ -->
<!--
Typical markup:
@ -250,17 +250,42 @@ do it for earlier branch release files.
<listitem>
<para>
Queries that previously automatically cast values to
<type>TEXT</type> might now need explicit casts (Peter, Tom)
Non-character values are no longer automatically cast to
<type>TEXT</> (Peter, Tom)
</para>
<para>
Previously, a function or operator that took a <type>TEXT</>
parameter used to automatically cast a non-<type>TEXT</> value to
<type>TEXT</> and call the function or operator (assuming there was
no other matching function or operator). That no longer happens
and an explicit cast to <type>TEXT</> is now required. For example,
these expressions now throw an error:
<programlisting>
substr(current_date, 1, 1);
23 LIKE '%2%'
5.4 ~ '6';
</programlisting>
but these work because of the explicit casts:
<programlisting>
substr(current_date::text, 1, 1);
23::text LIKE '%2%
5.4::text ~ '6';
</programlisting>
</para>
<para>
<type>CHAR</> and <type>VARCHAR</> still cast to <type>TEXT</>
automatically. Concatenation (<literal>||</>) with non-<type>TEXT</>
types is still automatically cast, assuming one of the parameters
is textual. While this change will require additional casts for
some queries, it also eliminates some unusual behavior.
</para>
<para>
Data types other than <type>CHAR</> and <type>VARCHAR</> no
longer automatically cast to <type>TEXT</>, except in the
limited case of concatenation (<literal>||</>) where the other
input is textual. While this change will require additional
casts for some queries it also eliminates some unusual
behavior.
</para>
</listitem>
@ -1035,10 +1060,9 @@ do it for earlier branch release files.
</para>
<para>
This features was previously in <filename>contrib/tsearch2</>. It
has been improved, moved into the server, and is now installed by
default. <filename>contrib/tsearch2</> now contains a compatibility
interface.
Text search has been improved, moved into the server, and is now
installed by default. <filename>contrib/tsearch2</> now contains
a compatibility interface.
</para>
</listitem>