9 Commits (16def00ffb3397b8cf1344534fbfd1f3b2cfd33d)

Author	SHA1	Message	Date
Tom Lane	f933766ba7	Restructure pg_opclass, pg_amop, and pg_amproc per previous discussions in ... pgsql-hackers. pg_opclass now has a row for each opclass supported by each index AM, not a row for each opclass name. This allows pg_opclass to show directly whether an AM supports an opclass, and furthermore makes it possible to store additional information about an opclass that might be AM-dependent. pg_opclass and pg_amop now store "lossy" and "haskeytype" information that we previously expected the user to remember to provide in CREATE INDEX commands. Lossiness is no longer an index-level property, but is associated with the use of a particular operator in a particular index opclass. Along the way, IndexSupportInitialize now uses the syscaches to retrieve pg_amop and pg_amproc entries. I find this reduces backend launch time by about ten percent, at the cost of a couple more special cases in catcache.c's IndexScanOK. Initial work by Oleg Bartunov and Teodor Sigaev, further hacking by Tom Lane. initdb forced.	25 years ago
Tom Lane	bec98a31c5	Revise aggregate functions per earlier discussions in pghackers. ... There's now only one transition value and transition function. NULL handling in aggregates is a lot cleaner. Also, use Numeric accumulators instead of integer accumulators for sum/avg on integer datatypes --- this avoids overflow at the cost of being a little slower. Implement VARIANCE() and STDDEV() aggregates in the standard backend. Also, enable new LIKE selectivity estimators by default. Unrelated change, but as long as I had to force initdb anyway...	26 years ago
Tom Lane	1f7ba1ebaf	Fix some bogosity in the tutorial examples.	26 years ago
Tom Lane	0dbffa704a	First cut at making useful selectivity estimates for range queries ... (ie, WHERE x > lowbound AND x < highbound). It's not very bright yet but it does something useful. Also, rename intltsel/intgtsel to scalarltsel/scalargtsel to reflect usage better. Extend convert_to_scalar to do something a little bit useful with string data types. Still need to make it do something with date/time datatypes, but I'll wait for Thomas's datetime unification dust to settle first. Eventually the routine ought not have any type-specific knowledge at all; it ought to be calling a type-dependent routine found via a pg_type column; but that's a task for another day.	26 years ago
Tom Lane	71ed7eb494	Revise handling of index-type-specific indexscan cost estimation, per ... pghackers discussion of 5-Jan-2000. The amopselect and amopnpages estimators are gone, and in their place is a per-AM amcostestimate procedure (linked to from pg_am, not pg_amop).	26 years ago
Marc G. Fournier	207acd86d7	From: Darren King <darrenk@insightdist.com> ... 1. Make 'all' works without complaint. Don't have to add the .exp files to the files list. They are made automagically when making the respective shared lib file. Only port that actually uses EXPSUFF (from makefiles/Makefile.*) is Aix, so if this breaks anybody else, let me know, asap. 2. Make 'clean' actually cleans up correctly. Previously, it would leave the .o files in C-code directory. 3. Changed references to reflect new location of .c files. 4. Added DELETE statements to complex.source so that it tidies up when done. Previously, it would leave things in pg_amop, pg_amproc and pg_opclass. Only possible to do this with the new SUBSELECT code in 6.3. Nice work, fellas... Not deleting the index entries would cause a non-fatal error if complex.sql was run again on the same database. Much tidier now. 5. Corrected the README. obj directory hasn't existed since Bryan redid the make way back when. Also changed the snipet from psql to match the current version. POSTGRES95?!? I don't think so. :)	28 years ago
Marc G. Fournier	5b3e78afe3	From: Darren King <darrenk@insightdist.com> ... Seem to remember someone posting to one of the lists a while back that the tutorial code wouldn't compile and/or run. Found four problems with it that will let it run. 1. Tutorial makefile had a recursive use of DLOBJS. 2. Some tutorial needed semi-colons added to many statements. 3. Complex tutorial didn't clean up after itself. 4. Advanced had a time-travel example. Commented it out and put a line pointing the user to contrib/spi/README.	28 years ago
Bruce Momjian	221d7296aa	Here is a bug fix and some spelling changes for the complex number tutorial ... code. I have also written a complete complex number package based on this tutorial; I will submit this as a contribution soon. Is there a particular format for contributed tar files? I have a C source file, two SQL files, and a Makefile. Thomas Lockhart	29 years ago
Marc G. Fournier	d31084e9d1	Postgres95 1.01 Distribution - Virgin Sources	30 years ago