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Postgres FD Implementation
Commit 66fe0fc8 authored by Tom Lane's avatar Tom Lane
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Fix poorly worded error messages for unary operator type resolution 

failures.  Fix some outright bugs too, including a reference to
uninitialized memory that would cause failures like this one:
select -('1234567890.1234567'::text);
ERROR:  Unable to locate type oid 2139062143 in catalog
parent ed0e2923
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Showing with 58 additions and 47 deletions
src/backend/parser/parse_oper.c
View file @ 66fe0fc8
/*-------------------------------------------------------------------------
*
* parse_oper.h
* parse_oper.c
* handle operator things for parser
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
......@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.35 2000/01/26 05:56:42 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.36 2000/02/27 02:48:15 tgl Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -35,6 +35,8 @@ static int unary_oper_get_candidates(char *op,
CandidateList *candidates,
char rightleft);
static void op_error(char *op, Oid arg1, Oid arg2);
static void unary_op_error(char *op, Oid arg, bool is_left_op);
Oid
any_ordering_op(Oid restype)
......@@ -224,11 +226,11 @@ oper_select_candidate(int nargs,
if (ncandidates <= 1)
{
if (ncandidates > 0 &&
(!can_coerce_type(1, &input_typeids[0], &candidates->args[0]) ||
(nargs > 1 &&
!can_coerce_type(1, &input_typeids[1], &candidates->args[1]))))
ncandidates = 0;
if (ncandidates > 0)
{
if (!can_coerce_type(nargs, input_typeids, candidates->args))
ncandidates = 0;
}
return (ncandidates == 1) ? candidates->args : NULL;
}
......@@ -279,11 +281,11 @@ oper_select_candidate(int nargs,
if (ncandidates <= 1)
{
if (ncandidates > 0 &&
(!can_coerce_type(1, &input_typeids[0], &candidates->args[0]) ||
(nargs > 1 &&
!can_coerce_type(1, &input_typeids[1], &candidates->args[1]))))
ncandidates = 0;
if (ncandidates > 0)
{
if (!can_coerce_type(nargs, input_typeids, candidates->args))
ncandidates = 0;
}
return (ncandidates == 1) ? candidates->args : NULL;
}
......@@ -368,8 +370,7 @@ oper_select_candidate(int nargs,
current_candidate != NULL;
current_candidate = current_candidate->next)
{
if (can_coerce_type(1, &input_typeids[0], &current_candidate->args[0])
&& can_coerce_type(1, &input_typeids[1], &current_candidate->args[1]))
if (can_coerce_type(nargs, input_typeids, current_candidate->args))
{
ncandidates++;
last_candidate = current_candidate;
......@@ -559,6 +560,7 @@ right_oper(char *op, Oid arg)
int ncandidates;
Oid *targetOid;
/* Try for exact match */
tup = SearchSysCacheTuple(OPERNAME,
PointerGetDatum(op),
ObjectIdGetDatum(arg),
......@@ -567,44 +569,35 @@ right_oper(char *op, Oid arg)
if (!HeapTupleIsValid(tup))
{
/* Try for inexact matches */
ncandidates = unary_oper_get_candidates(op, arg, &candidates, 'r');
if (ncandidates == 0)
{
elog(ERROR, "Can't find right op '%s' for type %u", op, arg);
return NULL;
unary_op_error(op, arg, FALSE);
}
else if (ncandidates == 1)
{
tup = SearchSysCacheTuple(OPERNAME,
PointerGetDatum(op),
ObjectIdGetDatum(candidates->args[0]),
ObjectIdGetDatum(candidates->args[0]),
ObjectIdGetDatum(InvalidOid),
CharGetDatum('r'));
Assert(HeapTupleIsValid(tup));
}
else
{
targetOid = oper_select_candidate(1, &arg, candidates);
if (targetOid != NULL)
{
tup = SearchSysCacheTuple(OPERNAME,
PointerGetDatum(op),
ObjectIdGetDatum(targetOid[0]),
ObjectIdGetDatum(InvalidOid),
ObjectIdGetDatum(*targetOid),
CharGetDatum('r'));
}
else
tup = NULL;
if (!HeapTupleIsValid(tup))
{
elog(ERROR, "Unable to convert right operator '%s' from type '%s'",
op, typeidTypeName(arg));
return NULL;
}
}
if (!HeapTupleIsValid(tup))
unary_op_error(op, arg, FALSE);
}
return (Operator) tup;
} /* right_oper() */
......@@ -619,6 +612,7 @@ left_oper(char *op, Oid arg)
int ncandidates;
Oid *targetOid;
/* Try for exact match */
tup = SearchSysCacheTuple(OPERNAME,
PointerGetDatum(op),
ObjectIdGetDatum(InvalidOid),
......@@ -627,43 +621,35 @@ left_oper(char *op, Oid arg)
if (!HeapTupleIsValid(tup))
{
/* Try for inexact matches */
ncandidates = unary_oper_get_candidates(op, arg, &candidates, 'l');
if (ncandidates == 0)
{
elog(ERROR, "Can't find left op '%s' for type %u", op, arg);
return NULL;
unary_op_error(op, arg, TRUE);
}
else if (ncandidates == 1)
{
tup = SearchSysCacheTuple(OPERNAME,
PointerGetDatum(op),
ObjectIdGetDatum(InvalidOid),
ObjectIdGetDatum(candidates->args[0]),
ObjectIdGetDatum(candidates->args[0]),
CharGetDatum('l'));
Assert(HeapTupleIsValid(tup));
}
else
{
targetOid = oper_select_candidate(1, &arg, candidates);
if (targetOid != NULL)
{
tup = SearchSysCacheTuple(OPERNAME,
PointerGetDatum(op),
ObjectIdGetDatum(InvalidOid),
ObjectIdGetDatum(*targetOid),
ObjectIdGetDatum(targetOid[0]),
CharGetDatum('l'));
}
else
tup = NULL;
if (!HeapTupleIsValid(tup))
{
elog(ERROR, "Unable to convert left operator '%s' from type '%s'",
op, typeidTypeName(arg));
return NULL;
}
}
if (!HeapTupleIsValid(tup))
unary_op_error(op, arg, TRUE);
}
return (Operator) tup;
} /* left_oper() */
......@@ -698,3 +684,28 @@ op_error(char *op, Oid arg1, Oid arg2)
"\n\tYou will have to retype this query using an explicit cast",
op, typeTypeName(tp1), typeTypeName(tp2));
}
/* unary_op_error()
* Give a somewhat useful error message when the operator for one type
* is not found.
*/
static void
unary_op_error(char *op, Oid arg, bool is_left_op)
{
Type tp1 = NULL;
if (typeidIsValid(arg))
tp1 = typeidType(arg);
else
{
elog(ERROR, "Argument of %s operator '%s' has an unknown type"
"\n\tProbably a bad attribute name",
(is_left_op ? "left" : "right"),
op);
}
elog(ERROR, "Unable to identify a %s operator '%s' for type '%s'"
"\n\tYou will have to retype this query using an explicit cast",
(is_left_op ? "left" : "right"),
op, typeTypeName(tp1));
}
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