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Support type modifiers for user-defined types, and pull most knowledge

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about typmod representation for standard types out into type-specific
typmod I/O functions.  Teodor Sigaev, with some editorialization by
Tom Lane.
This commit is contained in:
Tom Lane
2006-12-30 21:21:56 +00:00
parent 24b1f14eae
commit 5725b9d9af
47 changed files with 1628 additions and 685 deletions
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29
src/backend/parser/parse_expr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.202 2006/12/24 00:29:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.203 2006/12/30 21:21:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1810,29 +1810,6 @@ exprTypmod(Node *expr)
{
case T_Var:
return ((Var *) expr)->vartypmod;
case T_Const:
{
/* Be smart about string constants... */
Const *con = (Const *) expr;
switch (con->consttype)
{
case BPCHAROID:
if (!con->constisnull)
{
int32 len = VARSIZE(DatumGetPointer(con->constvalue)) - VARHDRSZ;
/* if multi-byte, take len and find # characters */
if (pg_database_encoding_max_length() > 1)
len = pg_mbstrlen_with_len(VARDATA(DatumGetPointer(con->constvalue)), len);
return len + VARHDRSZ;
}
break;
default:
break;
}
}
break;
case T_Param:
return ((Param *) expr)->paramtypmod;
case T_FuncExpr:
@ -2024,14 +2001,16 @@ typecast_expression(ParseState *pstate, Node *expr, TypeName *typename)
{
Oid inputType = exprType(expr);
Oid targetType;
int32 targetTypmod;
targetType = typenameTypeId(pstate, typename);
targetTypmod = typenameTypeMod(pstate, typename, targetType);
if (inputType == InvalidOid)
return expr; /* do nothing if NULL input */
expr = coerce_to_target_type(pstate, expr, inputType,
targetType, typename->typmod,
targetType, targetTypmod,
COERCION_EXPLICIT,
COERCE_EXPLICIT_CAST);
if (expr == NULL)