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/*-------------------------------------------------------------------------
*
* rewriteManip.h
* Querytree manipulation subroutines for query rewriter.
*
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/rewrite/rewriteManip.h
*
*-------------------------------------------------------------------------
*/
#ifndef REWRITEMANIP_H
#define REWRITEMANIP_H
#include "nodes/parsenodes.h"
typedef struct replace_rte_variables_context replace_rte_variables_context;
typedef Node *(*replace_rte_variables_callback) (Var *var,
replace_rte_variables_context *context);
struct replace_rte_variables_context
{
replace_rte_variables_callback callback; /* callback function */
void *callback_arg; /* context data for callback function */
int target_varno; /* RTE index to search for */
int sublevels_up; /* (current) nesting depth */
bool inserted_sublink; /* have we inserted a SubLink? */
};
extern void OffsetVarNodes(Node *node, int offset, int sublevels_up);
extern void ChangeVarNodes(Node *node, int old_varno, int new_varno,
int sublevels_up);
extern void IncrementVarSublevelsUp(Node *node, int delta_sublevels_up,
int min_sublevels_up);
extern void IncrementVarSublevelsUp_rtable(List *rtable,
int delta_sublevels_up, int min_sublevels_up);
extern bool rangeTableEntry_used(Node *node, int rt_index,
int sublevels_up);
extern bool attribute_used(Node *node, int rt_index, int attno,
int sublevels_up);
extern Query *getInsertSelectQuery(Query *parsetree, Query ***subquery_ptr);
extern void AddQual(Query *parsetree, Node *qual);
extern void AddInvertedQual(Query *parsetree, Node *qual);
extern bool contain_aggs_of_level(Node *node, int levelsup);
extern int locate_agg_of_level(Node *node, int levelsup);
extern int locate_windowfunc(Node *node);
extern bool checkExprHasAggs(Node *node);
extern bool checkExprHasWindowFuncs(Node *node);
extern bool checkExprHasSubLink(Node *node);
extern Node *replace_rte_variables(Node *node,
int target_varno, int sublevels_up,
replace_rte_variables_callback callback,
void *callback_arg,
bool *outer_hasSubLinks);
extern Node *replace_rte_variables_mutator(Node *node,
replace_rte_variables_context *context);
extern Node *map_variable_attnos(Node *node,
int target_varno, int sublevels_up,
const AttrNumber *attno_map, int map_length,
bool *found_whole_row);
extern Node *ResolveNew(Node *node, int target_varno, int sublevels_up,
RangeTblEntry *target_rte,
List *targetlist, int event, int update_varno,
bool *outer_hasSubLinks);
#endif /* REWRITEMANIP_H */