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Diffstat (limited to 'src/backend/parser/parse_func.c')
-rw-r--r--src/backend/parser/parse_func.c148
1 files changed, 132 insertions, 16 deletions
diff --git a/src/backend/parser/parse_func.c b/src/backend/parser/parse_func.c
index 583bbbf232f..c43020a769d 100644
--- a/src/backend/parser/parse_func.c
+++ b/src/backend/parser/parse_func.c
@@ -42,6 +42,8 @@ typedef enum
FUNCLOOKUP_AMBIGUOUS,
} FuncLookupError;
+static int func_lookup_failure_details(int fgc_flags, List *argnames,
+ bool proc_call);
static void unify_hypothetical_args(ParseState *pstate,
List *fargs, int numAggregatedArgs,
Oid *actual_arg_types, Oid *declared_arg_types);
@@ -115,6 +117,7 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
int nvargs;
Oid vatype;
FuncDetailCode fdresult;
+ int fgc_flags;
char aggkind = 0;
ParseCallbackState pcbstate;
@@ -266,6 +269,7 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
fdresult = func_get_detail(funcname, fargs, argnames, nargs,
actual_arg_types,
!func_variadic, true, proc_call,
+ &fgc_flags,
&funcid, &rettype, &retset,
&nvargs, &vatype,
&declared_arg_types, &argdefaults);
@@ -563,8 +567,8 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
errmsg("procedure %s is not unique",
func_signature_string(funcname, nargs, argnames,
actual_arg_types)),
- errhint("Could not choose a best candidate procedure. "
- "You might need to add explicit type casts."),
+ errdetail("Could not choose a best candidate procedure."),
+ errhint("You might need to add explicit type casts."),
parser_errposition(pstate, location)));
else
ereport(ERROR,
@@ -572,8 +576,8 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
errmsg("function %s is not unique",
func_signature_string(funcname, nargs, argnames,
actual_arg_types)),
- errhint("Could not choose a best candidate function. "
- "You might need to add explicit type casts."),
+ errdetail("Could not choose a best candidate function."),
+ errhint("You might need to add explicit type casts."),
parser_errposition(pstate, location)));
}
else
@@ -601,7 +605,9 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
/*
* No function, and no column either. Since we're dealing with
- * function notation, report "function does not exist".
+ * function notation, report "function/procedure does not exist".
+ * Depending on what was returned in fgc_flags, we can add some color
+ * to that with detail or hint messages.
*/
if (list_length(agg_order) > 1 && !agg_within_group)
{
@@ -611,8 +617,8 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
errmsg("function %s does not exist",
func_signature_string(funcname, nargs, argnames,
actual_arg_types)),
- errhint("No aggregate function matches the given name and argument types. "
- "Perhaps you misplaced ORDER BY; ORDER BY must appear "
+ errdetail("No aggregate function matches the given name and argument types."),
+ errhint("Perhaps you misplaced ORDER BY; ORDER BY must appear "
"after all regular arguments of the aggregate."),
parser_errposition(pstate, location)));
}
@@ -622,8 +628,8 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
errmsg("procedure %s does not exist",
func_signature_string(funcname, nargs, argnames,
actual_arg_types)),
- errhint("No procedure matches the given name and argument types. "
- "You might need to add explicit type casts."),
+ func_lookup_failure_details(fgc_flags, argnames,
+ proc_call),
parser_errposition(pstate, location)));
else
ereport(ERROR,
@@ -631,8 +637,8 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
errmsg("function %s does not exist",
func_signature_string(funcname, nargs, argnames,
actual_arg_types)),
- errhint("No function matches the given name and argument types. "
- "You might need to add explicit type casts."),
+ func_lookup_failure_details(fgc_flags, argnames,
+ proc_call),
parser_errposition(pstate, location)));
}
@@ -905,6 +911,104 @@ ParseFuncOrColumn(ParseState *pstate, List *funcname, List *fargs,
return retval;
}
+/*
+ * Interpret the fgc_flags and issue a suitable detail or hint message.
+ *
+ * Helper function to reduce code duplication while throwing a
+ * function-not-found error.
+ */
+static int
+func_lookup_failure_details(int fgc_flags, List *argnames, bool proc_call)
+{
+ /*
+ * If not FGC_NAME_VISIBLE, we shouldn't raise the question of whether the
+ * arguments are wrong. If the function name was not schema-qualified,
+ * it's helpful to distinguish between doesn't-exist-anywhere and
+ * not-in-search-path; but if it was, there's really nothing to add to the
+ * basic "function/procedure %s does not exist" message.
+ *
+ * Note: we passed missing_ok = false to FuncnameGetCandidates, so there's
+ * no need to consider FGC_SCHEMA_EXISTS here: we'd have already thrown an
+ * error if an explicitly-given schema doesn't exist.
+ */
+ if (!(fgc_flags & FGC_NAME_VISIBLE))
+ {
+ if (fgc_flags & FGC_SCHEMA_GIVEN)
+ return 0; /* schema-qualified name */
+ else if (!(fgc_flags & FGC_NAME_EXISTS))
+ {
+ if (proc_call)
+ return errdetail("There is no procedure of that name.");
+ else
+ return errdetail("There is no function of that name.");
+ }
+ else
+ {
+ if (proc_call)
+ return errdetail("A procedure of that name exists, but it is not in the search_path.");
+ else
+ return errdetail("A function of that name exists, but it is not in the search_path.");
+ }
+ }
+
+ /*
+ * Next, complain if nothing had the right number of arguments. (This
+ * takes precedence over wrong-argnames cases because we won't even look
+ * at the argnames unless there's a workable number of arguments.)
+ */
+ if (!(fgc_flags & FGC_ARGCOUNT_MATCH))
+ {
+ if (proc_call)
+ return errdetail("No procedure of that name accepts the given number of arguments.");
+ else
+ return errdetail("No function of that name accepts the given number of arguments.");
+ }
+
+ /*
+ * If there are argnames, and we failed to match them, again we should
+ * mention that and not bring up the argument types.
+ */
+ if (argnames != NIL && !(fgc_flags & FGC_ARGNAMES_MATCH))
+ {
+ if (proc_call)
+ return errdetail("No procedure of that name accepts the given argument names.");
+ else
+ return errdetail("No function of that name accepts the given argument names.");
+ }
+
+ /*
+ * We could have matched all the given argnames and still not have had a
+ * valid call, either because of improper use of mixed notation, or
+ * because of missing arguments, or because the user misused VARIADIC. The
+ * rules about named-argument matching are finicky enough that it's worth
+ * trying to be specific about the problem. (The messages here are chosen
+ * with full knowledge of the steps that namespace.c uses while checking a
+ * potential match.)
+ */
+ if (argnames != NIL && !(fgc_flags & FGC_ARGNAMES_NONDUP))
+ return errdetail("In the closest available match, "
+ "an argument was specified both positionally and by name.");
+
+ if (argnames != NIL && !(fgc_flags & FGC_ARGNAMES_ALL))
+ return errdetail("In the closest available match, "
+ "not all required arguments were supplied.");
+
+ if (argnames != NIL && !(fgc_flags & FGC_ARGNAMES_VALID))
+ return errhint("This call would be correct if the variadic array were labeled VARIADIC and placed last.");
+
+ if (fgc_flags & FGC_VARIADIC_FAIL)
+ return errhint("The VARIADIC parameter must be placed last, even when using argument names.");
+
+ /*
+ * Otherwise, the problem must be incorrect argument types.
+ */
+ if (proc_call)
+ (void) errdetail("No procedure of that name accepts the given argument types.");
+ else
+ (void) errdetail("No function of that name accepts the given argument types.");
+ return errhint("You might need to add explicit type casts.");
+}
+
/* func_match_argtypes()
*
@@ -1372,9 +1476,14 @@ func_select_candidate(int nargs,
* 1) check for possible interpretation as a type coercion request
* 2) apply the ambiguous-function resolution rules
*
- * Return values *funcid through *true_typeids receive info about the function.
- * If argdefaults isn't NULL, *argdefaults receives a list of any default
- * argument expressions that need to be added to the given arguments.
+ * If there is no match at all, we return FUNCDETAIL_NOTFOUND, and *fgc_flags
+ * is filled with some flags that may be useful for issuing an on-point error
+ * message (see FuncnameGetCandidates).
+ *
+ * On success, return values *funcid through *true_typeids receive info about
+ * the function. If argdefaults isn't NULL, *argdefaults receives a list of
+ * any default argument expressions that need to be added to the given
+ * arguments.
*
* When processing a named- or mixed-notation call (ie, fargnames isn't NIL),
* the returned true_typeids and argdefaults are ordered according to the
@@ -1400,6 +1509,7 @@ func_get_detail(List *funcname,
bool expand_variadic,
bool expand_defaults,
bool include_out_arguments,
+ int *fgc_flags, /* return value */
Oid *funcid, /* return value */
Oid *rettype, /* return value */
bool *retset, /* return value */
@@ -1424,7 +1534,8 @@ func_get_detail(List *funcname,
/* Get list of possible candidates from namespace search */
raw_candidates = FuncnameGetCandidates(funcname, nargs, fargnames,
expand_variadic, expand_defaults,
- include_out_arguments, false);
+ include_out_arguments, false,
+ fgc_flags);
/*
* Quickly check if there is an exact match to the input datatypes (there
@@ -1594,7 +1705,10 @@ func_get_detail(List *funcname,
*/
if (fargnames != NIL && !expand_variadic && nargs > 0 &&
best_candidate->argnumbers[nargs - 1] != nargs - 1)
+ {
+ *fgc_flags |= FGC_VARIADIC_FAIL;
return FUNCDETAIL_NOTFOUND;
+ }
*funcid = best_candidate->oid;
*nvargs = best_candidate->nvargs;
@@ -2053,6 +2167,7 @@ LookupFuncNameInternal(ObjectType objtype, List *funcname,
{
Oid result = InvalidOid;
FuncCandidateList clist;
+ int fgc_flags;
/* NULL argtypes allowed for nullary functions only */
Assert(argtypes != NULL || nargs == 0);
@@ -2062,7 +2177,8 @@ LookupFuncNameInternal(ObjectType objtype, List *funcname,
/* Get list of candidate objects */
clist = FuncnameGetCandidates(funcname, nargs, NIL, false, false,
- include_out_arguments, missing_ok);
+ include_out_arguments, missing_ok,
+ &fgc_flags);
/* Scan list for a match to the arg types (if specified) and the objtype */
for (; clist != NULL; clist = clist->next)
generated by cgit v1.2.3 (git 2.46.0) at 2025-09-27 07:21:56 +0000