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Add a hash table to cache lookups of 'C'-language functions (that is,

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dynamically loaded C functions).  Some limited testing suggests that
this puts the lookup speed for external functions just about on par
with built-in functions.  Per discussion with Eric Ridge.
This commit is contained in:
Tom Lane
2004-01-19 02:06:42 +00:00
parent 90d14654d6
commit 5c625a9326
3 changed files with 162 additions and 27 deletions
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3
src/include/fmgr.h
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@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/fmgr.h,v 1.32 2003/11/29 22:40:53 pgsql Exp $
* $PostgreSQL: pgsql/src/include/fmgr.h,v 1.33 2004/01/19 02:06:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -377,6 +377,7 @@ extern Datum OidFunctionCall9(Oid functionId, Datum arg1, Datum arg2,
* Routines in fmgr.c
*/
extern Pg_finfo_record *fetch_finfo_record(void *filehandle, char *funcname);
extern void clear_external_function_hash(void *filehandle);
extern Oid fmgr_internal_function(const char *proname);
extern Oid get_fn_expr_rettype(FmgrInfo *flinfo);
extern Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum);