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path: root/src/backend/optimizer/plan/setrefs.c
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* Clean up #include in /include directory. Add scripts for checking includes.Bruce Momjian1999-07-15
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* Fix problems with grouping/aggregation in queries that useTom Lane1999-06-06
| | | | inheritance ... basically it was completely busted :-(
* Make functions static or NOT_USED as appropriate.Bruce Momjian1999-05-26
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* Another pgindent run. Sorry folks.Bruce Momjian1999-05-25
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* pgindent run over code.Bruce Momjian1999-05-25
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* Replaced targetlist entry in GroupClause by reference numberJan Wieck1999-05-12
| | | | | | | in Resdom and GroupClause so changing of resno's doesn't confuse the grouping any more. Jan
* Fix oversights in flatten_tlistentry and replace_clause_joinvar_refsTom Lane1999-05-06
| | | | that led to CASE expressions not working very well in joined queries.
* Revise union_planner and associated routines to clean up breakageTom Lane1999-05-03
| | | | | from EXCEPT/HAVING patch. Cases involving nontrivial GROUP BY expressions now work again. Also, the code is at least somewhat better documented...
* Several routines in setrefs.c would crash on array refsTom Lane1999-04-29
| | | | due to lack of check for recursing into a null subexpression.
* Insert a test for missing targetlist entry in replace_agg_clause.Tom Lane1999-04-26
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* Repair some problems in planner's handling of HAVING clauses.Tom Lane1999-04-19
| | | | | This fixes a few of the problems Hiroshi Inoue complained of, but I have not touched the rewrite-related issues.
* Fix a number of places that made faulty assumptions aboutTom Lane1999-02-15
| | | | what is_opclause will accept.
* Change my-function-name-- to my_function_name, and optimizer renames.Bruce Momjian1999-02-13
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* Rename Temp to Noname for noname tables.Bruce Momjian1999-02-09
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* Cleanup of source files where 'return' or 'var =' is alone on a line.Bruce Momjian1999-02-03
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* Optimizer rename ClauseInfo -> RestrictInfo. Update optimizer README.Bruce Momjian1999-02-03
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* Fix create_rule is->as.Bruce Momjian1999-02-02
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* pgindent file.Bruce Momjian1999-01-26
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* Agg/Aggreg cleanup and datetime.sql patch.Bruce Momjian1999-01-25
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* Rename Aggreg to Aggref.Bruce Momjian1999-01-24
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* Remove unused Choose node.Bruce Momjian1999-01-23
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* Hi!Bruce Momjian1999-01-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Add support for the CASE statement in the rewrite handling.Thomas G. Lockhart1998-12-14
| | | | | | Allows (at least some) rules and views. Still some trouble (crashes) with target CASE columns spanning tables, but lots now works.
* Make functions static or ifdef NOT_USED. Prevent pg_version creation.Bruce Momjian1998-10-08
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* Fix using GroupBy/non-GroupBy expressions in HAVING.Vadim B. Mikheev1998-09-09
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* OK, folks, here is the pgindent output.Bruce Momjian1998-09-01
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* Renaming cleanup, no pgindent yet.Bruce Momjian1998-09-01
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* Cleanup makeTargetEntry and remove internal.c.Bruce Momjian1998-07-20
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* 1) Queries using the having clause on base tables should work wellBruce Momjian1998-07-19
| | | | | | | | | | | | | | | | | | | | | | | | | now. Here some tested features, (examples included in the patch): 1.1) Subselects in the having clause 1.2) Double nested subselects 1.3) Subselects used in the where clause and in the having clause simultaneously 1.4) Union Selects using having 1.5) Indexes on the base relations are used correctly 1.6) Unallowed Queries are prevented (e.g. qualifications in the having clause that belong to the where clause) 1.7) Insert into as select 2) Queries using the having clause on view relations also work but there are some restrictions: 2.1) Create View as Select ... Having ...; using base tables in the select 2.1.1) The Query rewrite system: 2.1.2) Why are only simple queries allowed against a view from 2.1) ? 2.2) Select ... from testview1, testview2, ... having...; 3) Bug in ExecMergeJoin ?? Regards Stefan
* Remove un-needed braces around single statements.Bruce Momjian1998-06-15
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* Move HAVING function to proper file.Bruce Momjian1998-04-15
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* I started adding the Having Clause and it works quite fine forBruce Momjian1998-03-30
| | | | | | | | | | | | | | | | | | | | | | | | sequential scans! (I think it will also work with hash, index, etc but I did not check it out! I made some High level changes which should work for all access methods, but maybe I'm wrong. Please let me know.) Now it is possible to make queries like: select s.sname, max(p.pid), min(p.pid) from part p, supplier s where s.sid=p.sid group by s.sname having max(pid)=6 and min(pid)=1 or avg(pid)=4; Having does not work yet for queries that contain a subselect statement in the Having clause, I'll try to fix this in the next days. If there are some bugs, please let me know, I'll start to read the mailinglists now! Now here is the patch against the original 6.3 version (no snapshot!!): Stefan
* pgindent run before 6.3 release, with Thomas' requested changes.Bruce Momjian1998-02-26
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* Old planner() becomes union_planner(); new planner() makes initializationVadim B. Mikheev1998-02-13
| | | | | | | of some global variables to support subselects and calls union_planner(). Calls to SS_replace_correlation_vars() and SS_process_sublinks() in query_planner() before planning. Get rid of #ifdef INDEXSCAN_PATCH in createplan.c.
* Pass attypmod through to executor by adding to Var and Resdom.Bruce Momjian1998-02-10
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* Add Var.varlevelup to code. More parser cleanup.Bruce Momjian1998-01-20
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* Remove Query->qry_aggs and qry_numaggs and replace with Query->hasAggs.Bruce Momjian1998-01-15
| | | | | | | | | Pass List* of Aggregs into executor, and create needed array there. No longer need to double-processs Aggregs with second copy in Query. Fix crash when doing: select sum(x+1) from test where 1 > 0;
* Function cleanupo for List* when it should be Node *.Bruce Momjian1998-01-14
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* Cleanup of prototypes. FIx for PQtrace start/stop several times.Bruce Momjian1998-01-14
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* Goodbye ABORT. Hello ERROR for all errors.Bruce Momjian1998-01-07
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* Change elog(WARN) to elog(ERROR) and elog(ABORT).Bruce Momjian1998-01-05
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* Fix for select 1=1 or 2=2, select 1=1 and 2=2, and select sum(2+2).Bruce Momjian1997-12-22
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* Fix aggregates on inherited tables.Bruce Momjian1997-12-20
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* Used modified version of indent that understands over 100 typedefs.Bruce Momjian1997-09-08
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* Add typdefs to pgindent run.Bruce Momjian1997-09-08
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* Another PGINDENT run that changes variable indenting and case label ↵Bruce Momjian1997-09-08
| | | | indenting. Also static variable indenting.
* Massive commit to run PGINDENT on all *.c and *.h files.Bruce Momjian1997-09-07
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* Fix replace_agg_clause() for unary operators.Vadim B. Mikheev1997-06-12
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* Save Var' order in index_outerjoin_references().Vadim B. Mikheev1997-04-24
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* Cleanup MakefilesMarc G. Fournier1996-10-31
| | | | | | Add #include "postgres.h" and #include <sys/types.h>
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