Move exprType(), exprTypmod(), expression_tree_walker(), and related routines

into nodes/nodeFuncs, so as to reduce wanton cross-subsystem #includes inside
the backend.  There's probably more that should be done along this line,
but this is a start anyway.

1 files changed, 34 insertions, 7 deletions

diff --git a/src/include/nodes/nodeFuncs.h b/src/include/nodes/nodeFuncs.h
index 375301a0dcd..f699fc1b68e 100644
--- a/src/include/nodes/nodeFuncs.h
+++ b/src/include/nodes/nodeFuncs.h
@@ -1,23 +1,50 @@
 /*-------------------------------------------------------------------------
  *
  * nodeFuncs.h
- *
- *
+ *		Various general-purpose manipulations of Node trees
  *
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/nodes/nodeFuncs.h,v 1.26 2008/01/01 19:45:58 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/nodeFuncs.h,v 1.27 2008/08/25 22:42:34 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
 #ifndef NODEFUNCS_H
 #define NODEFUNCS_H
 
-#include "nodes/primnodes.h"
+#include "nodes/parsenodes.h"
+
+
+/* flags bits for query_tree_walker and query_tree_mutator */
+#define QTW_IGNORE_RT_SUBQUERIES	0x01		/* subqueries in rtable */
+#define QTW_IGNORE_JOINALIASES		0x02		/* JOIN alias var lists */
+#define QTW_DONT_COPY_QUERY			0x04		/* do not copy top Query */
+
+
+extern Oid	exprType(Node *expr);
+extern int32 exprTypmod(Node *expr);
+extern bool exprIsLengthCoercion(Node *expr, int32 *coercedTypmod);
+extern bool expression_returns_set(Node *clause);
+
+extern bool expression_tree_walker(Node *node, bool (*walker) (),
+											   void *context);
+extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),
+												 void *context);
+
+extern bool query_tree_walker(Query *query, bool (*walker) (),
+										  void *context, int flags);
+extern Query *query_tree_mutator(Query *query, Node *(*mutator) (),
+											 void *context, int flags);
+
+extern bool range_table_walker(List *rtable, bool (*walker) (),
+										   void *context, int flags);
+extern List *range_table_mutator(List *rtable, Node *(*mutator) (),
+											 void *context, int flags);
 
-extern bool single_node(Node *node);
-extern bool var_is_outer(Var *var);
-extern bool var_is_rel(Var *var);
+extern bool query_or_expression_tree_walker(Node *node, bool (*walker) (),
+												   void *context, int flags);
+extern Node *query_or_expression_tree_mutator(Node *node, Node *(*mutator) (),
+												   void *context, int flags);
 
 #endif   /* NODEFUNCS_H */