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On second thought, explain why date_trunc("week") on interval values is

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not supported in the error message, rather than the docs.
This commit is contained in:
Bruce Momjian 2012-08-15 16:48:05 -04:00
parent 74f4881d7c
commit 083b9133aa
2 changed files with 11 additions and 9 deletions
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5
doc/src/sgml/func.sgml
View File

@ -7050,11 +7050,6 @@ date_trunc('<replaceable>field</replaceable>', <replaceable>source</replaceable>
</simplelist>
</para>
<para>
<literal>week</literal> is not supported for <type>interval</>
values because months usually have fractional weeks.
</para>
<para>
Examples:
<screen>

15
src/backend/utils/adt/timestamp.c
View File

@ -3710,10 +3710,17 @@ interval_trunc(PG_FUNCTION_ARGS)
break;
default:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("interval units \"%s\" not supported",
lowunits)));
if (val == DTK_WEEK)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("interval units \"%s\" not supported "
"because months usually have fractional weeks",
lowunits)));
else
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("interval units \"%s\" not supported",
lowunits)));
}
if (tm2interval(tm, fsec, result) != 0)