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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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10
src/backend/utils/adt/formatting.c
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@ -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'.