granicus.if.org Git - postgresql/blob - src/include/nodes/nodeFuncs.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * nodeFuncs.h
   4  *              Various general-purpose manipulations of Node trees
   5  *
   6  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * $PostgreSQL: pgsql/src/include/nodes/nodeFuncs.h,v 1.31 2009/06/11 14:49:11 momjian Exp $
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13 #ifndef NODEFUNCS_H
  14 #define NODEFUNCS_H
  15
  16 #include "nodes/parsenodes.h"
  17
  18
  19 /* flags bits for query_tree_walker and query_tree_mutator */
  20 #define QTW_IGNORE_RT_SUBQUERIES        0x01            /* subqueries in rtable */
  21 #define QTW_IGNORE_CTE_SUBQUERIES       0x02            /* subqueries in cteList */
  22 #define QTW_IGNORE_RC_SUBQUERIES        0x03            /* both of above */
  23 #define QTW_IGNORE_JOINALIASES          0x04            /* JOIN alias var lists */
  24 #define QTW_EXAMINE_RTES                        0x08            /* examine RTEs */
  25 #define QTW_DONT_COPY_QUERY                     0x10            /* do not copy top Query */
  26
  27
  28 extern Oid      exprType(Node *expr);
  29 extern int32 exprTypmod(Node *expr);
  30 extern bool exprIsLengthCoercion(Node *expr, int32 *coercedTypmod);
  31 extern bool expression_returns_set(Node *clause);
  32
  33 extern int      exprLocation(Node *expr);
  34
  35 extern bool expression_tree_walker(Node *node, bool (*walker) (),
  36                                                                                            void *context);
  37 extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),
  38                                                                                                  void *context);
  39
  40 extern bool query_tree_walker(Query *query, bool (*walker) (),
  41                                                                                   void *context, int flags);
  42 extern Query *query_tree_mutator(Query *query, Node *(*mutator) (),
  43                                                                                          void *context, int flags);
  44
  45 extern bool range_table_walker(List *rtable, bool (*walker) (),
  46                                                                                    void *context, int flags);
  47 extern List *range_table_mutator(List *rtable, Node *(*mutator) (),
  48                                                                                          void *context, int flags);
  49
  50 extern bool query_or_expression_tree_walker(Node *node, bool (*walker) (),
  51                                                                                                    void *context, int flags);
  52 extern Node *query_or_expression_tree_mutator(Node *node, Node *(*mutator) (),
  53                                                                                                    void *context, int flags);
  54
  55 extern bool raw_expression_tree_walker(Node *node, bool (*walker) (),
  56                                                                                                    void *context);
  57
  58 #endif   /* NODEFUNCS_H */