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Require superuser privilege to create a binary-compatible cast, per

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discussion some weeks ago.  Also, add a check that two types to be
binary-equivalenced match as to typlen, typbyval, and typalign; if
they don't then it's surely a mistake to equivalence them.
This commit is contained in:
Tom Lane
2002-10-04 22:08:44 +00:00
parent 04c57d68ce
commit d2db166c75
2 changed files with 33 additions and 5 deletions
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9
doc/src/sgml/ref/create_cast.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_cast.sgml,v 1.5 2002/09/18 21:35:20 tgl Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_cast.sgml,v 1.6 2002/10/04 22:08:44 tgl Exp $ -->
<refentry id="SQL-CREATECAST">
<refmeta>
@ -81,10 +81,9 @@ SELECT 'The time is ' || now();
</programlisting>
will be allowed only if the cast from type <type>timestamp</> to
<type>text</type> is marked <literal>AS IMPLICIT</>. Otherwise it
will be necessary to write one of
will be necessary to write the cast explicitly, for example
<programlisting>
SELECT 'The time is ' || CAST(now() AS text);
SELECT 'The time is ' || now()::text;
</programlisting>
(We generally use the term <firstterm>implicit
cast</firstterm> to describe this kind of cast.)
@ -107,7 +106,9 @@ SELECT 'The time is ' || now()::text;
<para>
To be able to create a cast, you must own the source or the target
data type.
data type. To create a binary-compatible cast, you must be superuser
(this restriction is made because an erroneous binary-compatible cast
conversion can easily crash the server).
</para>
<variablelist>