Обсуждение: pgsql-server: Further review of xact.c state machine for nested

Log Message:
-----------
Further review of xact.c state machine for nested transactions.  Fix
problems with starting subtransactions inside already-failed transactions.
Clean up some comments.

Modified Files:
--------------
    pgsql-server/src/backend/access/transam:
        xact.c (r1.169 -> r1.170)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/transam/xact.c.diff?r1=1.169&r2=1.170)
    pgsql-server/src/test/regress/expected:
        transactions.out (r1.4 -> r1.5)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/expected/transactions.out.diff?r1=1.4&r2=1.5)
    pgsql-server/src/test/regress/sql:
        transactions.sql (r1.4 -> r1.5)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/sql/transactions.sql.diff?r1=1.4&r2=1.5)