Log Message:
-----------
Release the exclusive lock on the table early after truncating it in lazy
vacuum, instead of waiting till commit.
Modified Files:
--------------
pgsql/src/backend/commands:
vacuumlazy.c (r1.92 -> r1.93)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/vacuumlazy.c?r1=1.92&r2=1.93)