diff options
Diffstat (limited to '')
-rw-r--r-- | src/include/rewrite/rewriteManip.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/include/rewrite/rewriteManip.h b/src/include/rewrite/rewriteManip.h new file mode 100644 index 0000000..5ece816 --- /dev/null +++ b/src/include/rewrite/rewriteManip.h @@ -0,0 +1,87 @@ +/*------------------------------------------------------------------------- + * + * rewriteManip.h + * Querytree manipulation subroutines for query rewriter. + * + * + * Portions Copyright (c) 1996-2020, 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" + +struct AttrMap; /* avoid including attmap.h here */ + + +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? */ +}; + +typedef enum ReplaceVarsNoMatchOption +{ + REPLACEVARS_REPORT_ERROR, /* throw error if no match */ + REPLACEVARS_CHANGE_VARNO, /* change the Var's varno, nothing else */ + REPLACEVARS_SUBSTITUTE_NULL /* replace with a NULL Const */ +} ReplaceVarsNoMatchOption; + + +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 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 bool contain_windowfuncs(Node *node); +extern int locate_windowfunc(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 struct AttrMap *attno_map, + Oid to_rowtype, bool *found_whole_row); + +extern Node *ReplaceVarsFromTargetList(Node *node, + int target_varno, int sublevels_up, + RangeTblEntry *target_rte, + List *targetlist, + ReplaceVarsNoMatchOption nomatch_option, + int nomatch_varno, + bool *outer_hasSubLinks); + +#endif /* REWRITEMANIP_H */ |