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/*-------------------------------------------------------------------------
*
* fcache.h
* Declarations for function cache records.
*
* The first time any Oper or Func node is evaluated, we compute a cache
* record for the function being invoked, and save a pointer to the cache
* record in the Oper or Func node. This saves repeated lookup of info
* about the function.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: fcache.h,v 1.16 2001/03/22 04:01:12 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef FCACHE_H
#define FCACHE_H
#include "fmgr.h"
#include "nodes/execnodes.h"
/*
* A FunctionCache record is built for all functions regardless of language.
*
* We store the fmgr lookup info to avoid recomputing it on each call.
* We also store a prebuilt FunctionCallInfo struct. When evaluating a
* function-returning-set, fcinfo holds the argument values across calls
* so that we need not re-evaluate the arguments for each call. Even for
* non-set functions, fcinfo saves a few cycles per call by allowing us to
* avoid redundant setup of its fields.
*/
typedef struct FunctionCache
{
/*
* Function manager's lookup info for the target function.
*/
FmgrInfo func;
/*
* Per-call info for calling the target function. Unvarying fields
* are set up by init_fcache(). Argument values are filled in as
* needed.
*/
FunctionCallInfoData fcinfo;
/*
* "Resultinfo" node --- used only if target function returns a set.
*/
ReturnSetInfo rsinfo;
/*
* argsValid is true when we are evaluating a set-valued function and
* we are in the middle of a call series; we want to pass the same
* argument values to the function again (and again, until it returns
* ExprEndResult).
*/
bool argsValid; /* TRUE if fcinfo contains valid arguments */
/*
* hasSetArg is true if we found a set-valued argument to the
* function. This causes the function result to be a set as well.
*/
bool hasSetArg; /* some argument returns a set */
} FunctionCache;
extern FunctionCachePtr init_fcache(Oid foid, int nargs,
MemoryContext fcacheCxt);
#endif /* FCACHE_H */
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