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Consider interpreting a function call as a trivial (binary-compatible)

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type coercion after failing to find an exact match in pg_proc, but before
considering interpretations that involve a function call with one or
more argument type coercions.  This avoids surprises wherein what looks
like a type coercion is interpreted as coercing to some third type and
then to the destination type, as in Dave Blasby's bug report of 3-Oct-01.
See subsequent discussion in pghackers.
This commit is contained in:
Tom Lane
2001-10-04 22:06:46 +00:00
parent 1ca0874faa
commit 03b0a589d1
4 changed files with 119 additions and 84 deletions
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18
src/include/parser/parse_func.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: parse_func.h,v 1.31 2001/05/19 00:33:20 momjian Exp $
* $Id: parse_func.h,v 1.32 2001/10/04 22:06:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -38,6 +38,15 @@ typedef struct _CandidateList
struct _CandidateList *next;
} *CandidateList;
/* Result codes for func_get_detail */
typedef enum
{
FUNCDETAIL_NOTFOUND, /* no suitable interpretation */
FUNCDETAIL_NORMAL, /* found a matching function */
FUNCDETAIL_COERCION /* it's a type coercion request */
} FuncDetailCode;
extern Node *ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr,
int precedence);
extern Node *ParseFuncOrColumn(ParseState *pstate,
@ -45,9 +54,10 @@ extern Node *ParseFuncOrColumn(ParseState *pstate,
bool agg_star, bool agg_distinct,
int precedence);
extern bool func_get_detail(char *funcname, int nargs, Oid *argtypes,
Oid *funcid, Oid *rettype,
bool *retset, Oid **true_typeids);
extern FuncDetailCode func_get_detail(char *funcname, List *fargs,
int nargs, Oid *argtypes,
Oid *funcid, Oid *rettype,
bool *retset, Oid **true_typeids);
extern bool typeInheritsFrom(Oid subclassTypeId, Oid superclassTypeId);