Hello,
I am sending small patch, that allows hooking transformation stage of parser.
Regards
Pavel Stehule
*** ./src/backend/parser/parse_expr.c.orig 2009-03-17 16:20:18.000000000 +0100
--- ./src/backend/parser/parse_expr.c 2009-03-17 16:24:43.000000000 +0100
***************
*** 36,41 ****
--- 36,44 ----
bool Transform_null_equals = false;
+ /* Hook for plugins to get control in transformExpr */
+ ParseExprTransform_hook_type ParseExprTransform_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);
***************
*** 100,105 ****
--- 103,117 ----
Node *
transformExpr(ParseState *pstate, Node *expr)
{
+ if (ParseExprTransform_hook)
+ return (*ParseExprTransform_hook) (pstate, expr);
+ else
+ return standard_transformExpr(pstate, expr);
+ }
+
+ Node *
+ standard_transformExpr(ParseState *pstate, Node *expr)
+ {
Node *result = NULL;
if (expr == NULL)
*** ./src/include/parser/parse_expr.h.orig 2009-03-17 16:25:34.000000000 +0100
--- ./src/include/parser/parse_expr.h 2009-03-17 16:38:29.000000000 +0100
***************
*** 18,23 ****
--- 18,29 ----
/* GUC parameters */
extern bool Transform_null_equals;
+ /* Hook for parser plugin to get control in transformExpr */
+ typedef Node *(*ParseExprTransform_hook_type) (ParseState *pstate, Node *expr);
+ extern PGDLLIMPORT ParseExprTransform_hook_type ParseExprTransform_hook;
+
extern Node *transformExpr(ParseState *pstate, Node *expr);
+ extern Node *standard_transformExpr(ParseState *pstate, Node *expr);
+
#endif /* PARSE_EXPR_H */
--
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