pgsql/ oc/src/sgml/catalogs.sgml oc/src/sgml/i ...

CVSROOT:    /home/projects/pgsql/cvsroot
Module name:    pgsql
Changes by:    tgl@hub.org    01/05/06 20:43:27

Modified files:
    doc/src/sgml   : catalogs.sgml indices.sgml reference.sgml
                     xoper.sgml
    doc/src/sgml/ref: allfiles.sgml alter_table.sgml vacuum.sgml
    src/backend/access/common: tupdesc.c
    src/backend/access/gist: gist.c
    src/backend/access/hash: hash.c
    src/backend/access/heap: tuptoaster.c
    src/backend/access/nbtree: nbtree.c
    src/backend/access/rtree: rtree.c
    src/backend/catalog: genbki.sh heap.c index.c
    src/backend/commands: analyze.c command.c vacuum.c
    src/backend/executor: nodeSort.c
    src/backend/nodes: copyfuncs.c equalfuncs.c readfuncs.c
    src/backend/optimizer/path: costsize.c joinpath.c
    src/backend/optimizer/plan: createplan.c initsplan.c planner.c
    src/backend/optimizer/prep: prepunion.c
    src/backend/optimizer/util: pathnode.c plancat.c
    src/backend/parser: analyze.c gram.y keywords.c parse_relation.c
    src/backend/tcop: utility.c
    src/backend/utils/adt: selfuncs.c
    src/backend/utils/cache: lsyscache.c syscache.c
    src/backend/utils/sort: tuplesort.c
    src/include/access: tuptoaster.h
    src/include/catalog: catversion.h heap.h index.h indexing.h
                         pg_attribute.h pg_class.h pg_statistic.h
    src/include/commands: command.h vacuum.h
    src/include    : config.h.in
    src/include/nodes: execnodes.h parsenodes.h primnodes.h
                       relation.h
    src/include/optimizer: cost.h pathnode.h
    src/include/utils: lsyscache.h syscache.h tuplesort.h
    src/interfaces/ecpg/preproc: keywords.c preproc.y
    src/test/regress/expected: oidjoins.out opr_sanity.out
    src/test/regress/sql: oidjoins.sql
Added files:
    doc/src/sgml/ref: analyze.sgml

Log message:
    Rewrite of planner statistics-gathering code.  ANALYZE is now available as
    a separate statement (though it can still be invoked as part of VACUUM, too).
    pg_statistic redesigned to be more flexible about what statistics are
    stored.  ANALYZE now collects a list of several of the most common values,
    not just one, plus a histogram (not just the min and max values).  Random
    sampling is used to make the process reasonably fast even on very large
    tables.  The number of values and histogram bins collected is now
    user-settable via an ALTER TABLE command.

    There is more still to do; the new stats are not being used everywhere
    they could be in the planner.  But the remaining changes for this project
    should be localized, and the behavior is already better than before.

    A not-very-related change is that sorting now makes use of btree comparison
    routines if it can find one, rather than invoking '<' twice.