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Remove overspecification of precision of CURRENT_TIMESTAMP, LOCALTIMESTAMP, 

CURRENT_TIME, and LOCALTIME: now they just produce "timestamptz" not
"timestamptz(6)", etc.  This makes the behavior more consistent with our
choice to not assign a specific default precision to column datatypes.
It should also save a few cycles at runtime due to not having to invoke
the round-to-given-precision functions.
I also took the opportunity to translate CURRENT_TIMESTAMP into "now()"
instead of an invocation of the timestamptz input converter --- this should
save a few cycles too.
This commit is contained in:
Tom Lane 2005-06-24 14:28:06 +00:00
parent e2d088de03
commit db53fa6dc7
1 changed files with 12 additions and 51 deletions
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63
src/backend/parser/gram.y
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@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.496 2005/06/22 21:14:29 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.497 2005/06/24 14:28:06 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -6002,14 +6002,6 @@ ConstDatetime:
* - thomas 2001-09-06
*/
$$->timezone = $2;
/* SQL99 specified a default precision of six
* for schema definitions. But for timestamp
* literals we don't want to throw away precision
* so leave this as unspecified for now.
* Later, we may want a different production
* for schemas. - thomas 2001-12-07
*/
$$->typmod = -1;
}
| TIME '(' Iconst ')' opt_timezone
{
@ -6039,11 +6031,6 @@ ConstDatetime:
$$ = SystemTypeName("timetz");
else
$$ = SystemTypeName("time");
/* SQL99 specified a default precision of zero.
* See comments for timestamp above on why we will
* leave this unspecified for now. - thomas 2001-12-07
*/
$$->typmod = -1;
}
;
@ -6715,7 +6702,9 @@ func_expr: func_name '(' ')'
*
* This could be simplified if we had a way to generate
* an expression tree representing runtime application
* of type-input conversion functions...
* of type-input conversion functions. (As of PG 7.3
* that is actually possible, but not clear that we want
* to rely on it.)
*/
A_Const *s = makeNode(A_Const);
TypeName *d;
@ -6742,12 +6731,6 @@ func_expr: func_name '(' ')'
s->typename = SystemTypeName("text");
d = SystemTypeName("timetz");
/* SQL99 mandates a default precision of zero for TIME
* fields in schemas. However, for CURRENT_TIME
* let's preserve the microsecond precision we
* might see from the system clock. - thomas 2001-12-07
*/
d->typmod = 6;
$$ = (Node *)makeTypeCast((Node *)s, d);
}
@ -6784,25 +6767,15 @@ func_expr: func_name '(' ')'
| CURRENT_TIMESTAMP
{
/*
* Translate as "'now'::text::timestamptz".
* See comments for CURRENT_DATE.
* Translate as "now()", since we have a function that
* does exactly what is needed.
*/
A_Const *s = makeNode(A_Const);
TypeName *d;
s->val.type = T_String;
s->val.val.str = "now";
s->typename = SystemTypeName("text");
d = SystemTypeName("timestamptz");
/* SQL99 mandates a default precision of 6 for timestamp.
* Also, that is about as precise as we will get since
* we are using a microsecond time interface.
* - thomas 2001-12-07
*/
d->typmod = 6;
$$ = (Node *)makeTypeCast((Node *)s, d);
FuncCall *n = makeNode(FuncCall);
n->funcname = SystemFuncName("now");
n->args = NIL;
n->agg_star = FALSE;
n->agg_distinct = FALSE;
$$ = (Node *)n;
}
| CURRENT_TIMESTAMP '(' Iconst ')'
{
@ -6849,12 +6822,6 @@ func_expr: func_name '(' ')'
s->typename = SystemTypeName("text");
d = SystemTypeName("time");
/* SQL99 mandates a default precision of zero for TIME
* fields in schemas. However, for LOCALTIME
* let's preserve the microsecond precision we
* might see from the system clock. - thomas 2001-12-07
*/
d->typmod = 6;
$$ = (Node *)makeTypeCast((Node *)s, d);
}
@ -6902,12 +6869,6 @@ func_expr: func_name '(' ')'
s->typename = SystemTypeName("text");
d = SystemTypeName("timestamp");
/* SQL99 mandates a default precision of 6 for timestamp.
* Also, that is about as precise as we will get since
* we are using a microsecond time interface.
* - thomas 2001-12-07
*/
d->typmod = 6;
$$ = (Node *)makeTypeCast((Node *)s, d);
}