Обсуждение: pgsql: Tweak nodeBitmapAnd to stop evaluating sub-plan scans if it finds

Log Message:
-----------
Tweak nodeBitmapAnd to stop evaluating sub-plan scans if it finds it's
got an empty bitmap after any step; the remaining subplans can no longer
affect the result.  Per a suggestion from Ilia Kantor.

Modified Files:
--------------
    pgsql/src/backend/executor:
        nodeBitmapAnd.c (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeBitmapAnd.c.diff?r1=1.2&r2=1.3)
    pgsql/src/backend/nodes:
        tidbitmap.c (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/tidbitmap.c.diff?r1=1.5&r2=1.6)
    pgsql/src/backend/optimizer/path:
        indxpath.c (r1.187 -> r1.188)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/indxpath.c.diff?r1=1.187&r2=1.188)
    pgsql/src/include/nodes:
        tidbitmap.h (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/tidbitmap.h.diff?r1=1.1&r2=1.2)