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docs: to_timestamp and to_date do minimal range checking

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Initial patch from Steve Crawford
This commit is contained in:
Bruce Momjian 2014-03-05 20:45:27 -05:00
parent b44fc39fce
commit e2224faf17
1 changed files with 14 additions and 0 deletions
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doc/src/sgml/func.sgml
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@ -5783,6 +5783,20 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
</para>
</listitem>
<listitem>
<para>
<function>to_timestamp</function> and <function>to_date</function>
exist to handle input formats that cannot be converted by
simple casting. These functions interpret input liberally,
with minimal error checking. While they produce valid output,
the conversion can yield unexpected results. For example,
input to these functions is not restricted by normal ranges,
thus <literal>to_date('20096040','YYYYMMDD')</literal> returns
<literal>2014-01-17</literal> rather than causing an error.
Casting does not have this behavior.
</para>
</listitem>
<listitem>
<para>
Ordinary text is allowed in <function>to_char</function>