pgsql-server/src backend/catalog/dependency.c ...

CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    tgl@postgresql.org    02/09/11 10:48:55

Modified files:
    src/backend/catalog: dependency.c
    src/backend/optimizer/util: clauses.c var.c
    src/backend/rewrite: rewriteDefine.c rewriteHandler.c
                         rewriteManip.c
    src/include/optimizer: clauses.h
    src/backend/optimizer/prep: prepunion.c

Log message:
    Tweak querytree-dependency-extraction code so that columns of tables
    that are explicitly JOINed are not considered dependencies unless they
    are actually used in the query: mere presence in the joinaliasvars
    list of a JOIN RTE doesn't count as being used.  The patch touches
    a number of files because I needed to generalize the API of
    query_tree_walker to support an additional flag bit, but the changes
    are otherwise quite small.