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postgres/src/include/optimizer/prep.h

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Postgres95 1.01 Distribution - Virgin Sources
30 years ago
/*-------------------------------------------------------------------------
*
Change my-function-name-- to my_function_name, and optimizer renames.
27 years ago
* prep.h
Further improvements in cnfify: reduce amount of self-recursion in or_normalize, remove detection of duplicate subexpressions (since it's highly unlikely to be worth the amount of time it takes), and introduce a dnfify() entry point so that unintelligible backwards logic in UNION processing can be eliminated. This is just an intermediate step --- next thing is to look at not forcing the qual into CNF form when it would be better off in DNF form.
26 years ago
* prototypes for files in optimizer/prep/
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
*
*
Update copyright to 2002.
24 years ago
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
Add: * Portions Copyright (c) 1996-2000, PostgreSQL, Inc to all files copyright Regents of Berkeley. Man, that's a lot of files.
26 years ago
* Portions Copyright (c) 1994, Regents of the University of California
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
*
Allow the planner to collapse explicit inner JOINs together, rather than necessarily following the JOIN syntax to develop the query plan. The old behavior is still available by setting GUC variable JOIN_COLLAPSE_LIMIT to 1. Also create a GUC variable FROM_COLLAPSE_LIMIT to control the similar decision about when to collapse sub-SELECT lists into their parent lists. (This behavior existed already, but the limit was always GEQO_THRESHOLD/2; now it's separately adjustable.)
23 years ago
* $Id: prep.h,v 1.35 2003/01/25 23:10:30 tgl Exp $
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
*
*-------------------------------------------------------------------------
*/
#ifndef PREP_H
Massive commit to run PGINDENT on all *.c and *.h files.
28 years ago
#define PREP_H
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
Change #include's to use <> and "" as appropriate.
27 years ago
#include "nodes/parsenodes.h"
More cleanup
27 years ago
#include "nodes/plannodes.h"
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
IN clauses appearing at top level of WHERE can now be handled as joins. There are two implementation techniques: the executor understands a new JOIN_IN jointype, which emits at most one matching row per left-hand row, or the result of the IN's sub-select can be fed through a DISTINCT filter and then joined as an ordinary relation. Along the way, some minor code cleanup in the optimizer; notably, break out most of the jointree-rearrangement preprocessing in planner.c and put it in a new file prep/prepjointree.c.
23 years ago
/*
* prototypes for prepjointree.c
*/
Allow the planner to collapse explicit inner JOINs together, rather than necessarily following the JOIN syntax to develop the query plan. The old behavior is still available by setting GUC variable JOIN_COLLAPSE_LIMIT to 1. Also create a GUC variable FROM_COLLAPSE_LIMIT to control the similar decision about when to collapse sub-SELECT lists into their parent lists. (This behavior existed already, but the limit was always GEQO_THRESHOLD/2; now it's separately adjustable.)
23 years ago
extern int from_collapse_limit;
extern int join_collapse_limit;
IN clauses appearing at top level of WHERE can now be handled as joins. There are two implementation techniques: the executor understands a new JOIN_IN jointype, which emits at most one matching row per left-hand row, or the result of the IN's sub-select can be fed through a DISTINCT filter and then joined as an ordinary relation. Along the way, some minor code cleanup in the optimizer; notably, break out most of the jointree-rearrangement preprocessing in planner.c and put it in a new file prep/prepjointree.c.
23 years ago
extern Node *pull_up_IN_clauses(Query *parse, Node *node);
extern Node *pull_up_subqueries(Query *parse, Node *jtnode,
bool below_outer_join);
extern Node *preprocess_jointree(Query *parse, Node *jtnode);
extern List *get_relids_in_jointree(Node *jtnode);
extern List *get_relids_for_join(Query *parse, int joinrelid);
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
/*
Fix problems with grouping/aggregation in queries that use inheritance ... basically it was completely busted :-(
27 years ago
* prototypes for prepqual.c
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
*/
First cut at doing something reasonable with OR-of-ANDs WHERE conditions. There are some pretty bogus heuristics in prepqual.c that try to decide whether to output CNF or DNF format; they need to be replaced, likely. Right now the code is probably too willing to choose DNF form, which might hurt performance in some cases that used to work OK. But at least we have a foundation to build on.
26 years ago
extern List *canonicalize_qual(Expr *qual, bool removeAndFlag);
Used modified version of indent that understands over 100 typedefs.
28 years ago
extern List *cnfify(Expr *qual, bool removeAndFlag);
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
/*
Fix problems with grouping/aggregation in queries that use inheritance ... basically it was completely busted :-(
27 years ago
* prototypes for preptlist.c
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
*/
OK, folks, here is the pgindent output.
27 years ago
extern List *preprocess_targetlist(List *tlist, int command_type,
Used modified version of indent that understands over 100 typedefs.
28 years ago
Index result_relation, List *range_table);
Postgres95 1.01 Distribution - Virgin Sources
30 years ago
Fix problems with grouping/aggregation in queries that use inheritance ... basically it was completely busted :-(
27 years ago
/*
* prototypes for prepunion.c
*/
Reimplementation of UNION/INTERSECT/EXCEPT. INTERSECT/EXCEPT now meet the SQL92 semantics, including support for ALL option. All three can be used in subqueries and views. DISTINCT and ORDER BY work now in views, too. This rewrite fixes many problems with cross-datatype UNIONs and INSERT/SELECT where the SELECT yields different datatypes than the INSERT needs. I did that by making UNION subqueries and SELECT in INSERT be treated like subselects-in-FROM, thereby allowing an extra level of targetlist where the datatype conversions can be inserted safely. INITDB NEEDED!
25 years ago
extern Plan *plan_set_operations(Query *parse);
Restructure handling of inheritance queries so that they work with outer joins, and clean things up a good deal at the same time. Append plan node no longer hacks on rangetable at runtime --- instead, all child tables are given their own RT entries during planning. Concept of multiple target tables pushed up into execMain, replacing bug-prone implementation within nodeAppend. Planner now supports generating Append plans for inheritance sets either at the top of the plan (the old way) or at the bottom. Expanding at the bottom is appropriate for tables used as sources, since they may appear inside an outer join; but we must still expand at the top when the target of an UPDATE or DELETE is an inheritance set, because we actually need a different targetlist and junkfilter for each target table in that case. Fortunately a target table can't be inside an outer join... Bizarre mutual recursion between union_planner and prepunion.c is gone --- in fact, union_planner doesn't really have much to do with union queries anymore, so I renamed it grouping_planner.
25 years ago
fix_parsetree_attnums was not nearly smart enough about walking parse trees. Also rewrite find_all_inheritors() in a more intelligible style.
26 years ago
extern List *find_all_inheritors(Oid parentrel);
Modify optimizer data structures so that IndexOptInfo lists built for create_index_paths are not immediately discarded, but are available for subsequent planner work. This allows avoiding redundant syscache lookups in several places. Change interface to operator selectivity estimation procedures to allow faster and more flexible estimation. Initdb forced due to change of pg_proc entries for selectivity functions!
25 years ago
extern List *expand_inherted_rtentry(Query *parse, Index rti,
pgindent run on all C files. Java run to follow. initdb/regression tests pass.
24 years ago
bool dup_parent);
Restructure handling of inheritance queries so that they work with outer joins, and clean things up a good deal at the same time. Append plan node no longer hacks on rangetable at runtime --- instead, all child tables are given their own RT entries during planning. Concept of multiple target tables pushed up into execMain, replacing bug-prone implementation within nodeAppend. Planner now supports generating Append plans for inheritance sets either at the top of the plan (the old way) or at the bottom. Expanding at the bottom is appropriate for tables used as sources, since they may appear inside an outer join; but we must still expand at the top when the target of an UPDATE or DELETE is an inheritance set, because we actually need a different targetlist and junkfilter for each target table in that case. Fortunately a target table can't be inside an outer join... Bizarre mutual recursion between union_planner and prepunion.c is gone --- in fact, union_planner doesn't really have much to do with union queries anymore, so I renamed it grouping_planner.
25 years ago
extern Node *adjust_inherited_attrs(Node *node,
pgindent run. Make it all clean.
25 years ago
Index old_rt_index, Oid old_relid,
Index new_rt_index, Oid new_relid);
Another pgindent run. Fixes enum indenting, and improves #endif spacing. Also adds space for one-line comments.
24 years ago
Push down outer qualification clauses into UNION and INTERSECT subqueries. Per pghackers discussion from back around 1-August.
23 years ago
extern bool tlist_same_datatypes(List *tlist, List *colTypes, bool junkOK);
New pgindent run with fixes suggested by Tom. Patch manually reviewed, initdb/regression tests pass.
24 years ago
#endif /* PREP_H */