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00001 /*------------------------------------------------------------------------- 00002 * 00003 * rewriteManip.h 00004 * Querytree manipulation subroutines for query rewriter. 00005 * 00006 * 00007 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group 00008 * Portions Copyright (c) 1994, Regents of the University of California 00009 * 00010 * src/include/rewrite/rewriteManip.h 00011 * 00012 *------------------------------------------------------------------------- 00013 */ 00014 #ifndef REWRITEMANIP_H 00015 #define REWRITEMANIP_H 00016 00017 #include "nodes/parsenodes.h" 00018 00019 00020 typedef struct replace_rte_variables_context replace_rte_variables_context; 00021 00022 typedef Node *(*replace_rte_variables_callback) (Var *var, 00023 replace_rte_variables_context *context); 00024 00025 struct replace_rte_variables_context 00026 { 00027 replace_rte_variables_callback callback; /* callback function */ 00028 void *callback_arg; /* context data for callback function */ 00029 int target_varno; /* RTE index to search for */ 00030 int sublevels_up; /* (current) nesting depth */ 00031 bool inserted_sublink; /* have we inserted a SubLink? */ 00032 }; 00033 00034 typedef enum ReplaceVarsNoMatchOption 00035 { 00036 REPLACEVARS_REPORT_ERROR, /* throw error if no match */ 00037 REPLACEVARS_CHANGE_VARNO, /* change the Var's varno, nothing else */ 00038 REPLACEVARS_SUBSTITUTE_NULL /* replace with a NULL Const */ 00039 } ReplaceVarsNoMatchOption; 00040 00041 00042 extern void OffsetVarNodes(Node *node, int offset, int sublevels_up); 00043 extern void ChangeVarNodes(Node *node, int old_varno, int new_varno, 00044 int sublevels_up); 00045 extern void IncrementVarSublevelsUp(Node *node, int delta_sublevels_up, 00046 int min_sublevels_up); 00047 extern void IncrementVarSublevelsUp_rtable(List *rtable, 00048 int delta_sublevels_up, int min_sublevels_up); 00049 00050 extern bool rangeTableEntry_used(Node *node, int rt_index, 00051 int sublevels_up); 00052 extern bool attribute_used(Node *node, int rt_index, int attno, 00053 int sublevels_up); 00054 00055 extern Query *getInsertSelectQuery(Query *parsetree, Query ***subquery_ptr); 00056 00057 extern void AddQual(Query *parsetree, Node *qual); 00058 extern void AddInvertedQual(Query *parsetree, Node *qual); 00059 00060 extern bool contain_aggs_of_level(Node *node, int levelsup); 00061 extern int locate_agg_of_level(Node *node, int levelsup); 00062 extern bool contain_windowfuncs(Node *node); 00063 extern int locate_windowfunc(Node *node); 00064 extern bool checkExprHasSubLink(Node *node); 00065 00066 extern Node *replace_rte_variables(Node *node, 00067 int target_varno, int sublevels_up, 00068 replace_rte_variables_callback callback, 00069 void *callback_arg, 00070 bool *outer_hasSubLinks); 00071 extern Node *replace_rte_variables_mutator(Node *node, 00072 replace_rte_variables_context *context); 00073 00074 extern Node *map_variable_attnos(Node *node, 00075 int target_varno, int sublevels_up, 00076 const AttrNumber *attno_map, int map_length, 00077 bool *found_whole_row); 00078 00079 extern Node *ReplaceVarsFromTargetList(Node *node, 00080 int target_varno, int sublevels_up, 00081 RangeTblEntry *target_rte, 00082 List *targetlist, 00083 ReplaceVarsNoMatchOption nomatch_option, 00084 int nomatch_varno, 00085 bool *outer_hasSubLinks); 00086 00087 #endif /* REWRITEMANIP_H */
1.7.1