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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 1.17 2001/09/21 00:11:31 tgl 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 need to store argument values across calls when evaluating a
* function-returning-set. This is pretty ugly (and not re-entrant);
* current-evaluation info should be somewhere in the econtext, not in
* the querytree. As it stands, a function-returning-set can't safely be
* recursive, at least not if it's in plpgsql which will try to re-use
* the querytree at multiple execution nesting levels. FIXME someday.
*/
typedef struct FunctionCache
{
/*
* Function manager's lookup info for the target function.
*/
FmgrInfo func;
/*
* setArgsValid 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 setArgsValid;
/*
* Flag to remember whether we found a set-valued argument to the
* function. This causes the function result to be a set as well.
* Valid only when setArgsValid is true.
*/
bool setHasSetArg; /* some argument returns a set */
/*
* Current argument data for a set-valued function; contains valid
* data only if setArgsValid is true.
*/
FunctionCallInfoData setArgs;
} FunctionCache;
extern FunctionCachePtr init_fcache(Oid foid, int nargs,
MemoryContext fcacheCxt);
#endif /* FCACHE_H */
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