src/include/optimizer/var.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * var.h
   4  *        prototypes for optimizer/util/var.c.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * $PostgreSQL$
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef VAR_H
  15 #define VAR_H
  16
  17 #include "nodes/relation.h"
  18
  19 typedef enum
  20 {
  21         PVC_REJECT_PLACEHOLDERS,        /* throw error if PlaceHolderVar found */
  22         PVC_INCLUDE_PLACEHOLDERS,       /* include PlaceHolderVars in output list */
  23         PVC_RECURSE_PLACEHOLDERS        /* recurse into PlaceHolderVar argument */
  24 } PVCPlaceHolderBehavior;
  25
  26 extern Relids pull_varnos(Node *node);
  27 extern void pull_varattnos(Node *node, Bitmapset **varattnos);
  28 extern bool contain_var_clause(Node *node);
  29 extern bool contain_vars_of_level(Node *node, int levelsup);
  30 extern int      locate_var_of_level(Node *node, int levelsup);
  31 extern int      locate_var_of_relation(Node *node, int relid, int levelsup);
  32 extern int      find_minimum_var_level(Node *node);
  33 extern List *pull_var_clause(Node *node, PVCPlaceHolderBehavior behavior);
  34 extern Node *flatten_join_alias_vars(PlannerInfo *root, Node *node);
  35
  36 #endif   /* VAR_H */