Guy Rouillier wrote:
> On 1/6/2010 3:29 PM, Tom Lane wrote:
> > Guy Rouillier<guyr-...@burntmail.com> writes:
> >> Oracle states clearly in the SQL Reference manual:
> >
> >> "A modifier can appear in a format model more than once. In such a case,
> >> each subsequent occurrence toggles the effects of the modifier."
> >
> > *Toggles* the effect of the modifier? Egad, what drunken idiot chose
> > that specification?
>
> Eh, tomato, tomahto. If you assume that someone will strip leading
> zeroes consistently, the Oracle approach makes sense. That would be a
> reasonable assumption to make; why would I strip the zero off the month
> but leave it on the day? So, in the unusual case that you want to do
> such a thing, you are asked to use a second occurrence of FM to turn
> zero suppression back off.
I have developed the attached patch which implements FM control of YYY,
YY, and Y specifications. I also documented that we do not match
Oracle's toggle behavior. There are a few effects on regression test
output which are part of this patch.
--
Bruce Momjian <br...@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
Index: doc/src/sgml/func.sgml
===================================================================
RCS file: /cvsroot/pgsql/doc/src/sgml/func.sgml,v
retrieving revision 1.500
diff -c -c -r1.500 func.sgml
*** doc/src/sgml/func.sgml 1 Feb 2010 15:38:21 -0000 1.500
--- doc/src/sgml/func.sgml 6 Feb 2010 21:14:41 -0000
***************
*** 5174,5180 ****
<para>
<literal>FM</literal> suppresses leading zeroes and trailing blanks
that would otherwise be added to make the output of a pattern be
! fixed-width.
</para>
</listitem>
--- 5174,5184 ----
<para>
<literal>FM</literal> suppresses leading zeroes and trailing blanks
that would otherwise be added to make the output of a pattern be
! fixed-width. In <productname>PostgreSQL</productname>,
! <literal>FM</literal> modifies only the next specification, while in
! Oracle <literal>FM</literal> affects all subsequent
! specifications, and repeated <literal>FM</literal> modifiers
! toggle fill mode on and off.
</para>
</listitem>
Index: src/backend/utils/adt/formatting.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/adt/formatting.c,v
retrieving revision 1.162
diff -c -c -r1.162 formatting.c
*** src/backend/utils/adt/formatting.c 2 Jan 2010 16:57:53 -0000 1.162
--- src/backend/utils/adt/formatting.c 6 Feb 2010 21:14:42 -0000
***************
*** 515,520 ****
--- 515,521 ----
#define S_th(_s) (((_s) & DCH_S_th) ? 1 : 0)
#define S_TH_TYPE(_s) (((_s) & DCH_S_TH) ? TH_UPPER : TH_LOWER)
+ /* Oracle toggles FM behavior, we don't; see docs. */
#define S_FM(_s) (((_s) & DCH_S_FM) ? 1 : 0)
#define S_SP(_s) (((_s) & DCH_S_SP) ? 1 : 0)
#define S_TM(_s) (((_s) & DCH_S_TM) ? 1 : 0)
***************
*** 2411,2438 ****
break;
case DCH_YYY:
case DCH_IYY:
! snprintf(buff, sizeof(buff), "%03d",
n->key->id == DCH_YYY ?
ADJUST_YEAR(tm->tm_year, is_interval) :
ADJUST_YEAR(date2isoyear(tm->tm_year,
tm->tm_mon, tm->tm_mday),
is_interval));
i = strlen(buff);
! strcpy(s, buff + (i - 3));
if (S_THth(n->suffix))
str_numth(s, s, S_TH_TYPE(n->suffix));
s += strlen(s);
break;
case DCH_YY:
case DCH_IY:
! snprintf(buff, sizeof(buff), "%02d",
n->key->id == DCH_YY ?
ADJUST_YEAR(tm->tm_year, is_interval) :
ADJUST_YEAR(date2isoyear(tm->tm_year,
tm->tm_mon, tm->tm_mday),
is_interval));
i = strlen(buff);
! strcpy(s, buff + (i - 2));
if (S_THth(n->suffix))
str_numth(s, s, S_TH_TYPE(n->suffix));
s += strlen(s);
--- 2412,2441 ----
break;
case DCH_YYY:
case DCH_IYY:
! snprintf(buff, sizeof(buff), "%0*d",
! S_FM(n->suffix) ? 0 : 3,
n->key->id == DCH_YYY ?
ADJUST_YEAR(tm->tm_year, is_interval) :
ADJUST_YEAR(date2isoyear(tm->tm_year,
tm->tm_mon, tm->tm_mday),
is_interval));
i = strlen(buff);
! strcpy(s, buff + (i > 3 ? i - 3 : 0));
if (S_THth(n->suffix))
str_numth(s, s, S_TH_TYPE(n->suffix));
s += strlen(s);
break;
case DCH_YY:
case DCH_IY:
! snprintf(buff, sizeof(buff), "%0*d",
! S_FM(n->suffix) ? 0 : 2,
n->key->id == DCH_YY ?
ADJUST_YEAR(tm->tm_year, is_interval) :
ADJUST_YEAR(date2isoyear(tm->tm_year,
tm->tm_mon, tm->tm_mday),
is_interval));
i = strlen(buff);
! strcpy(s, buff + (i > 2 ? i - 2 : 0));
if (S_THth(n->suffix))
str_numth(s, s, S_TH_TYPE(n->suffix));
s += strlen(s);
***************
*** 2446,2452 ****
tm->tm_mon, tm->tm_mday),
is_interval));
i = strlen(buff);
! strcpy(s, buff + (i - 1));
if (S_THth(n->suffix))
str_numth(s, s, S_TH_TYPE(n->suffix));
s += strlen(s);
--- 2449,2455 ----
tm->tm_mon, tm->tm_mday),
is_interval));
i = strlen(buff);
! strcpy(s, buff + (i > 1 ? i - 1 : 0));
if (S_THth(n->suffix))
str_numth(s, s, S_TH_TYPE(n->suffix));
s += strlen(s);
Index: src/test/regress/expected/timestamp.out
===================================================================
RCS file: /cvsroot/pgsql/src/test/regress/expected/timestamp.out,v
retrieving revision 1.40
diff -c -c -r1.40 timestamp.out
*** src/test/regress/expected/timestamp.out 22 Mar 2009 01:12:32 -0000 1.40
--- src/test/regress/expected/timestamp.out 6 Feb 2010 21:14:44 -0000
***************
*** 1063,1070 ****
| 1,997 1997 997 97 7 20 1 2 7 45 14 6 2450494
| 1,997 1997 997 97 7 20 1 2 7 46 15 7 2450495
| 1,997 1997 997 97 7 20 1 2 7 47 16 1 2450496
! | 0,097 97 097 97 7 1 1 2 7 47 16 3 1686042
! | 0,097 97 097 97 7 1 1 2 7 47 16 7 1756536
| 0,597 597 597 97 7 6 1 2 7 47 16 5 1939157
| 1,097 1097 097 97 7 11 1 2 7 47 16 3 2121778
| 1,697 1697 697 97 7 17 1 2 7 47 16 7 2340924
--- 1063,1070 ----
| 1,997 1997 997 97 7 20 1 2 7 45 14 6 2450494
| 1,997 1997 997 97 7 20 1 2 7 46 15 7 2450495
| 1,997 1997 997 97 7 20 1 2 7 47 16 1 2450496
! | 0,097 97 97 97 7 1 1 2 7 47 16 3 1686042
! | 0,097 97 97 97 7 1 1 2 7 47 16 7 1756536
| 0,597 597 597 97 7 6 1 2 7 47 16 5 1939157
| 1,097 1097 097 97 7 11 1 2 7 47 16 3 2121778
| 1,697 1697 697 97 7 17 1 2 7 47 16 7 2340924
***************
*** 1561,1568 ****
| 1997 997 97 7 7 47 5
| 1997 997 97 7 7 48 6
| 1997 997 97 7 7 49 7
! | 97 097 97 7 7 44 2
! | 97 097 97 7 7 48 6
| 597 597 97 7 7 46 4
| 1097 097 97 7 7 44 2
| 1697 697 97 7 7 48 6
--- 1561,1568 ----
| 1997 997 97 7 7 47 5
| 1997 997 97 7 7 48 6
| 1997 997 97 7 7 49 7
! | 97 97 97 7 7 44 2
! | 97 97 97 7 7 48 6
| 597 597 97 7 7 46 4
| 1097 097 97 7 7 44 2
| 1697 697 97 7 7 48 6
Index: src/test/regress/expected/timestamptz.out
===================================================================
RCS file: /cvsroot/pgsql/src/test/regress/expected/timestamptz.out,v
retrieving revision 1.34
diff -c -c -r1.34 timestamptz.out
*** src/test/regress/expected/timestamptz.out 22 Mar 2009 01:12:32 -0000 1.34
--- src/test/regress/expected/timestamptz.out 6 Feb 2010 21:14:44 -0000
***************
*** 1148,1155 ****
| 1,997 1997 997 97 7 20 1 2 7 45 14 6 2450494
| 1,997 1997 997 97 7 20 1 2 7 46 15 7 2450495
| 1,997 1997 997 97 7 20 1 2 7 47 16 1 2450496
! | 0,097 97 097 97 7 1 1 2 7 47 16 3 1686042
! | 0,097 97 097 97 7 1 1 2 7 47 16 7 1756536
| 0,597 597 597 97 7 6 1 2 7 47 16 5 1939157
| 1,097 1097 097 97 7 11 1 2 7 47 16 3 2121778
| 1,697 1697 697 97 7 17 1 2 7 47 16 7 2340924
--- 1148,1155 ----
| 1,997 1997 997 97 7 20 1 2 7 45 14 6 2450494
| 1,997 1997 997 97 7 20 1 2 7 46 15 7 2450495
| 1,997 1997 997 97 7 20 1 2 7 47 16 1 2450496
! | 0,097 97 97 97 7 1 1 2 7 47 16 3 1686042
! | 0,097 97 97 97 7 1 1 2 7 47 16 7 1756536
| 0,597 597 597 97 7 6 1 2 7 47 16 5 1939157
| 1,097 1097 097 97 7 11 1 2 7 47 16 3 2121778
| 1,697 1697 697 97 7 17 1 2 7 47 16 7 2340924
***************
*** 1655,1662 ****
| 1997 997 97 7 7 47 5
| 1997 997 97 7 7 48 6
| 1997 997 97 7 7 49 7
! | 97 097 97 7 7 44 2
! | 97 097 97 7 7 48 6
| 597 597 97 7 7 46 4
| 1097 097 97 7 7 44 2
| 1697 697 97 7 7 48 6
--- 1655,1662 ----
| 1997 997 97 7 7 47 5
| 1997 997 97 7 7 48 6
| 1997 997 97 7 7 49 7
! | 97 97 97 7 7 44 2
! | 97 97 97 7 7 48 6
| 597 597 97 7 7 46 4
| 1097 097 97 7 7 44 2
| 1697 697 97 7 7 48 6
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