227 Commits (d244df95dbfc4b9544b8added7a407d20e870b2a)

Author	SHA1	Message	Date
Bruce Momjian	d244df95db	More optimizer speedups.	27 years ago
Bruce Momjian	129543e22d	optimizer cleanup	27 years ago
Bruce Momjian	dbd80c97f4	Optimizer fix for samekeys() and cost fixes for longer optimizer keys.	27 years ago
Bruce Momjian	9dbb0efb0b	Optmizer cleanup	27 years ago
Bruce Momjian	d5a785cd5a	Update find_typedefs for bsdi 4.0.	27 years ago
Bruce Momjian	f859c81c18	Rename Path.keys to Path.pathkeys. Too many 'keys' used for other things.	27 years ago
Bruce Momjian	318e593f03	Rename Temp to Noname for noname tables.	27 years ago
Bruce Momjian	78511d8fe9	Optimizer fix for samekeys.	27 years ago
Bruce Momjian	fe35ffe7e0	Major optimizer improvement for joining a large number of tables.	27 years ago
Bruce Momjian	54e5d25666	Optimizer cleanup.	27 years ago
Tom Lane	65d320e7e4	Fix bracketing error in CaseExpr code	27 years ago
Bruce Momjian	a553760845	Optimizer cleanup.	27 years ago
Bruce Momjian	7d2b3874aa	optimizer cleanup	27 years ago
Bruce Momjian	6e2edaf4b8	Optimizer cleanup.	27 years ago
Tom Lane	d3a85108c2	Fix silly typo in prune_joinrel	27 years ago
Bruce Momjian	c45e4925ab	Optimizer cleanups.	27 years ago
Bruce Momjian	ae12e25263	Update optimizer comments.	27 years ago
Bruce Momjian	ce3afccf7f	More optimizer cleanups.	27 years ago
Bruce Momjian	18fbe4142f	More optimizer renaming HInfo -> HashInfo.	27 years ago
Bruce Momjian	9322950aa4	Cleanup of source files where 'return' or 'var =' is alone on a line.	27 years ago
Bruce Momjian	8d9237d485	Optimizer rename ClauseInfo -> RestrictInfo. Update optimizer README.	27 years ago
Jan Wieck	f3a6b38e32	Sort node for ORDER BY is suppressed if choosen index scan will ... allways present tuples in the requested order. Jan	27 years ago
Bruce Momjian	4090d17fee	SET_ARGS cleanup	27 years ago
Bruce Momjian	f1b7823471	Make GEQO use dependent on table and index count.	27 years ago
Bruce Momjian	8e958b8a38	Fix create_rule is->as.	27 years ago
Tom Lane	757f403451	Tighten coding in samekeys(). Pretty braindead change, ... but it saves almost 10% of the runtime in Charles Hornberger's optimizer example, so what the heck ...	27 years ago
Bruce Momjian	692a65e6ff	pgindent file.	27 years ago
Bruce Momjian	1401f63dd1	Agg/Aggreg cleanup and datetime.sql patch.	27 years ago
Vadim B. Mikheev	247b3f9054	SELECT FOR UPDATE is implemented...	27 years ago
Bruce Momjian	17467bb7fb	Rename Aggreg to Aggref.	27 years ago
Bruce Momjian	598a4e15dd	Remove unused Choose node.	27 years ago
Bruce Momjian	bd8ffc6f3f	Hi! ... INTERSECT and EXCEPT is available for postgresql-v6.4! The patch against v6.4 is included at the end of the current text (in uuencoded form!) I also included the text of my Master's Thesis. (a postscript version). I hope that you find something of it useful and would be happy if parts of it find their way into the PostgreSQL documentation project (If so, tell me, then I send the sources of the document!) The contents of the document are: -) The first chapter might be of less interest as it gives only an overview on SQL. -) The second chapter gives a description on much of PostgreSQL's features (like user defined types etc. and how to use these features) -) The third chapter starts with an overview of PostgreSQL's internal structure with focus on the stages a query has to pass (i.e. parser, planner/optimizer, executor). Then a detailed description of the implementation of the Having clause and the Intersect/Except logic is given. Originally I worked on v6.3.2 but never found time enough to prepare and post a patch. Now I applied the changes to v6.4 to get Intersect and Except working with the new version. Chapter 3 of my documentation deals with the changes against v6.3.2, so keep that in mind when comparing the parts of the code printed there with the patched sources of v6.4. Here are some remarks on the patch. There are some things that have still to be done but at the moment I don't have time to do them myself. (I'm doing my military service at the moment) Sorry for that :-( -) I used a rewrite technique for the implementation of the Except/Intersect logic which rewrites the query to a semantically equivalent query before it is handed to the rewrite system (for views, rules etc.), planner, executor etc. -) In v6.3.2 the types of the attributes of two select statements connected by the UNION keyword had to match 100%. In v6.4 the types only need to be familiar (i.e. int and float can be mixed). Since this feature did not exist when I worked on Intersect/Except it does not work correctly for Except/Intersect queries WHEN USED IN COMBINATION WITH UNIONS! (i.e. sometimes the wrong type is used for the resulting table. This is because until now the types of the attributes of the first select statement have been used for the resulting table. When Intersects and/or Excepts are used in combination with Unions it might happen, that the first select statement of the original query appears at another position in the query which will be executed. The reason for this is the technique used for the implementation of Except/Intersect which does a query rewrite!) NOTE: It is NOT broken for pure UNION queries and pure INTERSECT/EXCEPT queries!!! -) I had to add the field intersect_clause to some data structures but did not find time to implement printfuncs for the new field. This does NOT break the debug modes but when an Except/Intersect is used the query debug output will be the already rewritten query. -) Massive changes to the grammar rules for SELECT and INSERT statements have been necessary (see comments in gram.y and documentation for deatails) in order to be able to use mixed queries like (SELECT ... UNION (SELECT ... EXCEPT SELECT)) INTERSECT SELECT...; -) When using UNION/EXCEPT/INTERSECT you will get: NOTICE: equal: "Don't know if nodes of type xxx are equal". I did not have time to add comparsion support for all the needed nodes, but the default behaviour of the function equal met my requirements. I did not dare to supress this message! That's the reason why the regression test for union will fail: These messages are also included in the union.out file! -) Somebody of you changed the union_planner() function for v6.4 (I copied the targetlist to new_tlist and that was removed and replaced by a cleanup of the original targetlist). These chnages violated some having queries executed against views so I changed it back again. I did not have time to examine the differences between the two versions but now it works :-) If you want to find out, try the file queries/view_having.sql on both versions and compare the results . Two queries won't produce a correct result with your version. regards Stefan	27 years ago
Bruce Momjian	7a6b562fdf	Apply Win32 patch from Horak Daniel.	27 years ago
Thomas G. Lockhart	4140c2f30e	Add support for the CASE statement in the rewrite handling. ... Allows (at least some) rules and views. Still some trouble (crashes) with target CASE columns spanning tables, but lots now works.	27 years ago
Thomas G. Lockhart	bedd04a551	Implement CASE expression.	27 years ago
Vadim B. Mikheev	6beba218d7	New HeapTuple structure/interface.	27 years ago
Vadim B. Mikheev	34680930d5	Fix using indices in OR. ... EXPLAIN all indices used.	27 years ago
Bruce Momjian	f03729c621	Fix for NOT in where clause causing crash.	27 years ago
Bruce Momjian	173c555948	Make functions static or ifdef NOT_USED. Prevent pg_version creation.	27 years ago
Bruce Momjian	3f8bc47d6a	cnf'ify cleanup	27 years ago
Tom Lane	d33bbb5b1f	Get rid of some long-dead code that thinks NOTIFY is passed to the ... planner/optimizer/executor. It isn't. Besides, most of the removed code consists of comments about how it's not right.	27 years ago
Bruce Momjian	b932b1b1c4	Allow 8-key indexes.	27 years ago
Bruce Momjian	3ce8a1b4ba	Fix for SELECT NOT boolfield FROM table	27 years ago
Bruce Momjian	a3c5a3cb2f	Cleanup for oid8[] from Tatsuo Ishii.	27 years ago
Bruce Momjian	748e300317	Fix for AND/OR handling.	27 years ago
Bruce Momjian	25a64f7519	Fix for \z formatting from Tom Lane.	27 years ago
Vadim B. Mikheev	9a2949e5dd	Fix using GroupBy/non-GroupBy expressions in HAVING.	27 years ago
Vadim B. Mikheev	994cfba1e5	Fix GroupBY func broken by HAVING.	27 years ago
Marc G. Fournier	370d6cdb64	From: David Hartwig <daybee@bellatlantic.net> ...	27 years ago
Bruce Momjian	b3f8bbb973	Oops missing file.	27 years ago