diff options
Diffstat (limited to 'doc/src/sgml/catalogs.sgml')
| -rw-r--r-- | doc/src/sgml/catalogs.sgml | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml index 1bf95871c0..aa699ae62e 100644 --- a/doc/src/sgml/catalogs.sgml +++ b/doc/src/sgml/catalogs.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.152 2007/05/15 19:13:54 neilc Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.153 2007/06/05 21:31:03 tgl Exp $ --> <!-- Documentation of the system catalogs, directed toward PostgreSQL developers --> @@ -1358,11 +1358,22 @@ </indexterm> <para> - The catalog <structname>pg_cast</structname> stores data type conversion paths, - both built-in paths and those defined with + The catalog <structname>pg_cast</structname> stores data type conversion + paths, both built-in paths and those defined with <xref linkend="sql-createcast" endterm="sql-createcast-title">. </para> + <para> + It should be noted that <structname>pg_cast</structname> does not represent + every type conversion that the system knows how to perform; only those that + cannot be deduced from some generic rule. For example, casting between a + domain and its base type is not explicitly represented in + <structname>pg_cast</structname>. Another important exception is that + <quote>I/O conversion casts</>, those performed using a data type's own + I/O functions to convert to or from <type>text</> or other string types, + are not explicitly represented in <structname>pg_cast</structname>. + </para> + <table> <title><structfield>pg_cast</> Columns</title> |