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Implement precision support for timestamp and time, both with and without

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time zones.
SQL99 spec requires a default of zero (round to seconds) which is set
 in gram.y as typmod is set in the parse tree. We *could* change to a
 default of either 6 (for internal compatibility with previous versions)
 or 2 (for external compatibility with previous versions).
Evaluate entries in pg_proc wrt the iscachable attribute for timestamp and
 other date/time types. Try to recognize cases where side effects like the
 current time zone setting may have an effect on results to decide whether
 something is cachable or not.
This commit is contained in:
Thomas G. Lockhart
2001-10-03 05:29:27 +00:00
parent a51de40fb6
commit 3e1beda2cd
22 changed files with 946 additions and 942 deletions
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227
src/backend/parser/parse_coerce.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_coerce.c,v 2.61 2001/09/28 08:09:09 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_coerce.c,v 2.62 2001/10/03 05:29:12 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -287,8 +287,7 @@ coerce_type_typmod(ParseState *pstate, Node *node,
* We assume that only typmod values greater than 0 indicate a forced
* conversion is necessary.
*/
if (atttypmod <= 0 ||
atttypmod == exprTypmod(node))
if ((atttypmod <= 0) || (atttypmod == exprTypmod(node)))
return node;
funcname = typeidTypeName(targetTypeId);
@@ -376,9 +375,9 @@ select_common_type(List *typeids, const char *context)
Oid ntype = (Oid) lfirsti(l);
/* move on to next one if no new information... */
if (ntype && (ntype != UNKNOWNOID) && (ntype != ptype))
if ((ntype != InvalidOid) && (ntype != UNKNOWNOID) && (ntype != ptype))
{
if (!ptype || ptype == UNKNOWNOID)
if ((ptype == InvalidOid) || ptype == UNKNOWNOID)
{
/* so far, only nulls so take anything... */
ptype = ntype;
@@ -456,6 +455,9 @@ coerce_to_common_type(ParseState *pstate, Node *node,
/* TypeCategory()
* Assign a category to the specified OID.
* XXX This should be moved to system catalog lookups
* to allow for better type extensibility.
* - thomas 2001-09-30
*/
CATEGORY
TypeCategory(Oid inType)
@@ -538,16 +540,22 @@ TypeCategory(Oid inType)
/* IsPreferredType()
* Check if this type is a preferred type.
* XXX This should be moved to system catalog lookups
* to allow for better type extensibility.
* - thomas 2001-09-30
*/
bool
IsPreferredType(CATEGORY category, Oid type)
{
return type == PreferredType(category, type);
return (type == PreferredType(category, type));
} /* IsPreferredType() */
/* PreferredType()
* Return the preferred type OID for the specified category.
* XXX This should be moved to system catalog lookups
* to allow for better type extensibility.
* - thomas 2001-09-30
*/
static Oid
PreferredType(CATEGORY category, Oid type)
@@ -603,210 +611,3 @@ PreferredType(CATEGORY category, Oid type)
}
return result;
} /* PreferredType() */
#ifdef NOT_USED
Oid
PromoteTypeToNext(Oid inType)
{
Oid result;
switch (inType)
{
case (CHAROID):
case (BPCHAROID):
result = VARCHAROID;
break;
case (VARCHAROID):
result = TEXTOID;
break;
case (INT2OID):
case (CASHOID):
result = INT4OID;
break;
case (INT4OID):
case (INT8OID):
case (FLOAT4OID):
result = FLOAT8OID;
break;
case (NUMERICOID):
result = NUMERICOID;
break;
case (DATEOID):
result = TIMESTAMPOID;
break;
case (ABSTIMEOID):
case (TIMESTAMPOID):
result = TIMESTAMPTZOID;
break;
case (TIMEOID):
case (RELTIMEOID):
result = INTERVALOID;
break;
case (BOOLOID):
case (TEXTOID):
case (FLOAT8OID):
case (TIMESTAMPTZOID):
case (INTERVALOID):
default:
result = inType;
break;
}
return result;
} /* PromoteTypeToNext() */
Oid
DemoteType(Oid inType)
{
Oid result;
switch (inType)
{
case (FLOAT4OID):
case (FLOAT8OID):
result = INT4OID;
break;
default:
result = inType;
break;
}
return result;
} /* DemoteType() */
Oid
PromoteLesserType(Oid inType1, Oid inType2, Oid *newType1, Oid *newType2)
{
Oid result;
if (inType1 == inType2)
{
result = PromoteTypeToNext(inType1);
inType1 = result;
*arg2 = result;
return result;
}
kind1 = ClassifyType(inType1);
kind2 = ClassifyType(*arg2);
if (kind1 != kind2)
{
*newType1 = inType1;
*newType2 = inType2;
result = InvalidOid;
}
isBuiltIn1 = IS_BUILTIN_TYPE(inType1);
isBuiltIn2 = IS_BUILTIN_TYPE(*arg2);
if (isBuiltIn1 && isBuiltIn2)
{
switch (*arg1)
{
case (CHAROID):
switch (*arg2)
{
case (BPCHAROID):
case (VARCHAROID):
case (TEXTOID):
case (INT2OID):
case (INT4OID):
case (FLOAT4OID):
case (FLOAT8OID):
case (CASHOID):
case (POINTOID):
case (LSEGOID):
case (LINEOID):
case (BOXOID):
case (PATHOID):
case (CIRCLEOID):
case (POLYGONOID):
case (InvalidOid):
case (UNKNOWNOID):
case (BOOLOID):
default:
*arg1 = InvalidOid;
*arg2 = InvalidOid;
result = InvalidOid;
}
}
}
else if (isBuiltIn1 && !isBuiltIn2)
{
if ((promotedType = PromoteBuiltInType(*arg1)) != *arg1)
{
*arg1 = promotedType;
return promotedType;
}
else if (CanCoerceType(*arg1, *arg2))
{
*arg1 = *arg2;
return *arg2;
}
}
else if (!isBuiltIn1 && isBuiltIn2)
{
if ((promotedType = PromoteBuiltInType(*arg2)) != *arg2)
{
*arg2 = promotedType;
return promotedType;
}
else if (CanCoerceType(*arg2, *arg1))
{
*arg2 = *arg1;
return *arg1;
}
}
if (*arg2 == InvalidOid)
return InvalidOid;
switch (*arg1)
{
case (CHAROID):
switch (*arg2)
{
case (BPCHAROID):
case (VARCHAROID):
case (TEXTOID):
case (INT2OID):
case (INT4OID):
case (FLOAT4OID):
case (FLOAT8OID):
case (CASHOID):
case (POINTOID):
case (LSEGOID):
case (LINEOID):
case (BOXOID):
case (PATHOID):
case (CIRCLEOID):
case (POLYGONOID):
case (InvalidOid):
case (UNKNOWNOID):
case (BOOLOID):
default:
*arg1 = InvalidOid;
*arg2 = InvalidOid;
result = InvalidOid;
}
}
}
#endif