granicus.if.org Git - postgresql/blob - src/include/rewrite/rewriteManip.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * rewriteManip.h
   4  *              Querytree manipulation subroutines for query rewriter.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * src/include/rewrite/rewriteManip.h
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef REWRITEMANIP_H
  15 #define REWRITEMANIP_H
  16
  17 #include "nodes/parsenodes.h"
  18
  19
  20 typedef struct replace_rte_variables_context replace_rte_variables_context;
  21
  22 typedef Node *(*replace_rte_variables_callback) (Var *var,
  23                                                                          replace_rte_variables_context *context);
  24
  25 struct replace_rte_variables_context
  26 {
  27         replace_rte_variables_callback callback;        /* callback function */
  28         void       *callback_arg;       /* context data for callback function */
  29         int                     target_varno;   /* RTE index to search for */
  30         int                     sublevels_up;   /* (current) nesting depth */
  31         bool            inserted_sublink;               /* have we inserted a SubLink? */
  32 };
  33
  34 typedef enum ReplaceVarsNoMatchOption
  35 {
  36         REPLACEVARS_REPORT_ERROR,       /* throw error if no match */
  37         REPLACEVARS_CHANGE_VARNO,       /* change the Var's varno, nothing else */
  38         REPLACEVARS_SUBSTITUTE_NULL /* replace with a NULL Const */
  39 } ReplaceVarsNoMatchOption;
  40
  41
  42 extern void OffsetVarNodes(Node *node, int offset, int sublevels_up);
  43 extern void ChangeVarNodes(Node *node, int old_varno, int new_varno,
  44                            int sublevels_up);
  45 extern void IncrementVarSublevelsUp(Node *node, int delta_sublevels_up,
  46                                                 int min_sublevels_up);
  47 extern void IncrementVarSublevelsUp_rtable(List *rtable,
  48                                                            int delta_sublevels_up, int min_sublevels_up);
  49
  50 extern bool rangeTableEntry_used(Node *node, int rt_index,
  51                                          int sublevels_up);
  52
  53 extern Query *getInsertSelectQuery(Query *parsetree, Query ***subquery_ptr);
  54
  55 extern void AddQual(Query *parsetree, Node *qual);
  56 extern void AddInvertedQual(Query *parsetree, Node *qual);
  57
  58 extern bool contain_aggs_of_level(Node *node, int levelsup);
  59 extern int      locate_agg_of_level(Node *node, int levelsup);
  60 extern bool contain_windowfuncs(Node *node);
  61 extern int      locate_windowfunc(Node *node);
  62 extern bool checkExprHasSubLink(Node *node);
  63
  64 extern Node *replace_rte_variables(Node *node,
  65                                           int target_varno, int sublevels_up,
  66                                           replace_rte_variables_callback callback,
  67                                           void *callback_arg,
  68                                           bool *outer_hasSubLinks);
  69 extern Node *replace_rte_variables_mutator(Node *node,
  70                                                           replace_rte_variables_context *context);
  71
  72 extern Node *map_variable_attnos(Node *node,
  73                                         int target_varno, int sublevels_up,
  74                                         const AttrNumber *attno_map, int map_length,
  75                                         bool *found_whole_row);
  76
  77 extern Node *ReplaceVarsFromTargetList(Node *node,
  78                                                   int target_varno, int sublevels_up,
  79                                                   RangeTblEntry *target_rte,
  80                                                   List *targetlist,
  81                                                   ReplaceVarsNoMatchOption nomatch_option,
  82                                                   int nomatch_varno,
  83                                                   bool *outer_hasSubLinks);
  84
  85 #endif   /* REWRITEMANIP_H */