8000 Do a better job of selecting candidates among functions · postgrespro/postgres_cluster@681c587 · GitHub
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Commit 681c587

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Thomas G. Lockhart
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Do a better job of selecting candidates among functions
 when no exact match. Clean up elog error messages.
1 parent b4def32 commit 681c587

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+48
-47
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1 file changed

+48
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‎src/backend/parser/parse_func.c

Lines changed: 48 additions & 47 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.38 1999/02/13 23:17:08 momjian Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.39 1999/02/23 07:51:53 thomas Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -828,66 +828,67 @@ func_select_candidate(int nargs,
828828
}
829829
}
830830

831+
if (ncandidates == 1)
832+
return candidates->args;
833+
831834
/*
832835
* Still too many candidates?
833836
* Try assigning types for the unknown columns.
834837
*/
835-
if (ncandidates > 1)
838+
for (i = 0; i < nargs; i++)
836839
{
837-
for (i = 0; i < nargs; i++)
840+
if (input_typeids[i] == UNKNOWNOID)
838841
{
839-
if (input_typeids[i] == UNKNOWNOID)
842+
slot_category = INVALID_TYPE;
843+
slot_type = InvalidOid;
844+
for (current_candidate = candidates;
845+
current_candidate != NULL;
846+
current_candidate = current_candidate->next)
840847
{
841-
slot_category = INVALID_TYPE;
842-
slot_type = InvalidOid;
843-
for (current_candidate = candidates;
844-
current_candidate != NULL;
845-
current_candidate = current_candidate->next)
846-
{
847-
current_typeids = current_candidate->args;
848-
current_type = current_typeids[i];
849-
current_category = TypeCategory(current_typeids[i]);
848+
current_typeids = current_candidate->args;
849+
current_type = current_typeids[i];
850+
current_category = TypeCategory(current_typeids[i]);
850851

851-
if (slot_category == InvalidOid)
852+
if (slot_category == InvalidOid)
853+
{
854+
slot_category = current_category;
855+
slot_type = current_type;
856+
}
857+
else if ((current_category != slot_category)
858+
&& IS_BUILTIN_TYPE(current_type))
859+
{
860+
return NULL;
861+
}
862+
else if (current_type != slot_type)
863+
{
864+
if (IsPreferredType(slot_category, current_type))
852865
{
853-
slot_category = current_category;
854866
slot_type = current_type;
867+
candidates = current_candidate;
855868
}
856-
else if ((current_category != slot_category)
857-
&& IS_BUILTIN_TYPE(current_type))
869+
else if (IsPreferredType(slot_category, slot_type))
858870
{
859-
return NULL;
871+
candidates->next = current_candidate->next;
860872
}
861-
else if (current_type != slot_type)
862-
{
863-
if (IsPreferredType(slot_category, current_type))
864-
{
865-
slot_type = current_type;
866-
candidates = current_candidate;
867-
}
868-
else
869-
{
870-
}
871-
}
872-
}
873-
874-
if (slot_type != InvalidOid)
875-
{
876-
input_typeids[i] = slot_type;
877873
}
878874
}
879-
else
875+
876+
if (slot_type != InvalidOid)
880877
{
878+
input_typeids[i] = slot_type;
881879
}
882880
}
883-
884-
ncandidates = 0;
885-
for (current_candidate = candidates;
886-
current_candidate != NULL;
887-
current_candidate = current_candidate->next)
888-
ncandidates++;
881+
else
882+
{
883+
}
889884
}
890885

886+
ncandidates = 0;
887+
for (current_candidate = candidates;
888+
current_candidate != NULL;
889+
current_candidate = current_candidate->next)
890+
ncandidates++;
891+
891892
if (ncandidates == 1)
892893
return candidates->args;
893894

@@ -964,7 +965,7 @@ func_get_detail(char *funcname,
964965
ftup = SearchSysCacheTuple(PRONAME,
965966
PointerGetDatum(funcname),
966967
Int32GetDatum(nargs),
967-
PointerGetDatum(*true_typeids),
968+
PointerGetDatum(*true_typeids),
968969
0);
969970
Assert(HeapTupleIsValid(ftup));
970971
}
@@ -976,8 +977,8 @@ func_get_detail(char *funcname,
976977
else if (ncandidates > 1)
977978
{
9789 A3D4 79
*true_typeids = func_select_candidate(nargs,
979-
current_input_typeids,
980-
current_function_typeids);
980+
current_input_typeids,
981+
current_function_typeids);
981982

982983
/* couldn't decide, so quit */
983984
if (*true_typeids == NULL)
@@ -991,9 +992,9 @@ func_get_detail(char *funcname,
991992
else
992993
{
993994
ftup = SearchSysCacheTuple(PRONAME,
994-
PointerGetDatum(funcname),
995+
PointerGetDatum(funcname),
995996
Int32GetDatum(nargs),
996-
PointerGetDatum(*true_typeids),
997+
PointerGetDatum(*true_typeids),
997998
0);
998999
Assert(HeapTupleIsValid(ftup));
9991000
}
@@ -1012,7 +1013,7 @@ func_get_detail(char *funcname,
10121013
{
10131014
tp = typeidType(oid_array[0]);
10141015
if (typeTypeFlag(tp) == 'c')
1015-
elog(ERROR, "func_get_detail: No such attribute or function '%s'", funcname);
1016+
elog(ERROR, "No such attribute or function '%s'", funcname);
10161017
}
10171018
}
10181019
else

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