*** ./src/backend/parser/parse_expr.c.orig	2009-04-20 14:03:09.000000000 +0200
--- ./src/backend/parser/parse_expr.c	2009-04-20 14:18:14.000000000 +0200
***************
*** 36,41 ****
--- 36,44 ----
  
  bool		Transform_null_equals = false;
  
+ /* Hook for plugins to get control in transformFuncCall */
+ ParseExprFuncCallTransform_hook_type ParseExprFuncCallTransform_hook = NULL;
+ 
  static Node *transformParamRef(ParseState *pstate, ParamRef *pref);
  static Node *transformAExprOp(ParseState *pstate, A_Expr *a);
  static Node *transformAExprAnd(ParseState *pstate, A_Expr *a);
***************
*** 1091,1096 ****
--- 1094,1108 ----
  static Node *
  transformFuncCall(ParseState *pstate, FuncCall *fn)
  {
+ 	if (ParseExprFuncCallTransform_hook)
+ 		return (*ParseExprFuncCallTransform_hook) (pstate, fn);
+ 	else
+ 		return standard_transformFuncCall(pstate, fn);
+ }
+ 
+ Node *
+ standard_transformFuncCall(ParseState *pstate, FuncCall *fn)
+ {
  	List	   *targs;
  	ListCell   *args;
  
*** ./src/include/parser/parse_expr.h.orig	2009-04-20 14:09:24.000000000 +0200
--- ./src/include/parser/parse_expr.h	2009-04-20 14:17:50.000000000 +0200
***************
*** 20,23 ****
--- 20,28 ----
  
  extern Node *transformExpr(ParseState *pstate, Node *expr);
  
+ /* hook for parse plugin to get control in transformFuncCall */
+ typedef Node *(*ParseExprFuncCallTransform_hook_type) (ParseState *pstate, FuncCall *expr);
+ extern PGDLLIMPORT ParseExprFuncCallTransform_hook_type ParseExprFuncCallTransform_hook;
+ extern Node *standard_transformFuncCall(ParseState *pstate, FuncCall *fn);
+ 
  #endif   /* PARSE_EXPR_H */