Update stats with bulk load requires manual intervention

[Barry Fritchman]

Update statistics is integrated with the bulk load capability, and was intended to operate with no additional manual steps required. Currently it will not work without certain unreasonable requirements, such as manually creating the Hive sample table, specifying the sampling rate, and issuing a separate command to update stats from the sample table.

[Trafodion-Gerrit (neo-devtools)]

Fix proposed to branch: master
Review: https://review.trafodion.org/1447

[Trafodion-Gerrit (neo-devtools)]

Reviewed: https://review.trafodion.org/1447
Committed: https://github.com/trafodion/core/commit/c732bd188a44636dd1e45486ddd24fd07c166b0d
Submitter: Trafodion Jenkins
Branch: master

commit c732bd188a44636dd1e45486ddd24fd07c166b0d
Author: Barry Fritchman <email address hidden>
Date: Fri Apr 3 17:54:05 2015 +0000

    Eliminate manual steps in load/ustat integration

    The fix achieves full integration of the bulk load utility with
    Update Statistics. The Hive backing sample table is now creeated
    automatically (formerly, we only wrote the HDFS files to be
    used by the Hive external table), the correct sampling percentage
    for the sample table is calculated, and the ustat command is
    launched fro1m the executor as one of the steps in execution of
    the bulk load utility.

    Change-Id: I9d5600c65f0752cbc7386b1c78cd10a091903015
    Closes-Bug: #1436939