1 /*------------------------------------------------------------------------- 2 * 3 * rewriteManip.h 4 * Querytree manipulation subroutines for query rewriter. 5 * 6 * 7 * Portions Copyright (c) 1996-2017, 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 Oid to_rowtype, 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 */ 86