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Document that "Q" is ignored by to_date and to_timestamp. Add C comment

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about the behavior.

Document that quotes in to_date, to_timestamp, to_number skip input
characters.
This commit is contained in:
Bruce Momjian 2010-03-03 22:28:42 +00:00
parent 61d75116a7
commit ea066f87c3
2 changed files with 12 additions and 7 deletions
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9
doc/src/sgml/func.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.506 2010/02/23 16:14:25 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.507 2010/03/03 22:28:42 momjian Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -5089,7 +5089,7 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
</row>
<row>
<entry><literal>Q</literal></entry>
<entry>quarter</entry>
<entry>quarter (ignored by <function>to_date</> and <function>to_timestamp</>)</entry>
</row>
<row>
<entry><literal>RM</literal></entry>
@ -5209,7 +5209,10 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
even if it contains pattern key words. For example, in
<literal>'"Hello Year "YYYY'</literal>, the <literal>YYYY</literal>
will be replaced by the year data, but the single <literal>Y</literal> in <literal>Year</literal>
will not be.
will not be. In <function>to_date</>, <function>to_number</>,
and <function>to_timestamp</>, double-quoted strings skip the number of
input characters contained in the string, e.g. <literal>"XX"</>
skips two input characters.
</para>
</listitem>

10
src/backend/utils/adt/formatting.c
View File

@ -1,7 +1,7 @@
/* -----------------------------------------------------------------------
* formatting.c
*
* $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.168 2010/02/26 02:01:08 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.169 2010/03/03 22:28:42 momjian Exp $
*
*
* Portions Copyright (c) 1999-2010, PostgreSQL Global Development Group
@ -2671,10 +2671,12 @@ DCH_from_char(FormatNode *node, char *in, TmFromChar *out)
s += SKIP_THth(n->suffix);
break;
case DCH_Q:
/*
* We ignore Q when converting to date because it is not
* normative.
* We ignore 'Q' when converting to date because it is
* unclear which date in the quarter to use, and some
* people specify both quarter and month, so if it was
* honored it might conflict with the supplied month.
* That is also why we don't throw an error.
*
* We still parse the source string for an integer, but it
* isn't stored anywhere in 'out'.