Sorter can have runaway memory consumption as it never frees
local allocations made in comparator_.Less(). In addition, it
doesn't check for errors generated during expression evaluation
so it may keep sorting even after failures have occurred.
This change fixes the problem by freeing local allocations for
every n invocations of comparator_.Less() where n is the row
batch size specified in the query options. Various error checks
are also added to return early if any error is encountered.
Change-Id: I941729b4836e5dbb827d4313a0b45bc5df2fa8e1
Reviewed-on: http://gerrit.cloudera.org:8080/3116
Reviewed-by: Michael Ho <kwho@cloudera.com>
Tested-by: Internal Jenkins
f7501d2ec1